Power transaction system and power transaction method

Abstract

To generate a GHG reduction effect of the whole power system by efficiently converting power derived from fossil fuel into green power in a power transaction market.SOLUTION: When a consumer C purchases PVC, a power transaction system transmits PVC purchase request data from the consumer C to a power bank PB via a retailer PR, and the power bank PB issues PVC data and transmits it to the consumer C via the retailer PR. When a consumer C makes a discharge request, the consumer C transmits PVC discharge request data to a power bank PB via a retailer PR, and the power bank PB notifies a power generation enterprise FFPP of a power supply instruction, instructs a green power generation device to start power generation, and starts power storage in a power storage device. The power generation company FFPP receives the power supply instruction and supplies power to the power system. When the return due date of the alternative power comes, the power bank PB supplies and returns the green power to the power system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electricity trading system and method that exchanges fossil fuel-derived electricity, which generates greenhouse gases (GHG) but can guarantee the necessary amount of electricity to be generated when needed, with green electricity, which does not generate GHG but cannot guarantee the necessary amount of electricity to be generated when needed. The difference in economic value, which becomes apparent as the exchange ratio at this time, is adjusted by the amount of electricity generated by the green electricity, thereby achieving an economically equivalent exchange and resulting in a GHG reduction effect. [Background technology]

[0002] Conventionally, there is known a technology for consigning electricity generated by an electricity supplier to an electricity supply destination. For example, Patent Document 1 discloses an electricity consignment system in which an energy trading token including an amount of electricity and a price according to an evaluation of the stored electricity based on the electricity storage information is issued, the energy trading token is transferred to the electricity supplier, and the electricity supplier supplies electricity to a designated electricity supply destination based on the energy trading token, etc. Such a conventional technology as represented by Patent Document 1 enables efficient electricity consignment operations in electricity trading. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-015467 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional technology represented by Patent Document 1 above is merely intended to efficiently manage the history of electricity transmission, and does not contribute to GX (Green Transformation), an initiative that aims to achieve both carbon neutrality and economic growth.

[0005] Environmental value trading such as "J Credits," "Green Power Certificates," and "Non-Fossil Certificates" is known as an effort to curb the generation of GHGs, which is the main goal of GX. However, problems such as "hot air issues," "carbon leakage issues," "moral hazard issues," and "measurement and verification issues" have been pointed out, and limitations on the effectiveness of this type of indirect approach are beginning to be pointed out.

[0006] Introducing green electricity is an effective way to more directly curb GHG emissions, but simply increasing this will make it difficult to adjust the supply balance with nuclear, coal-fired, hydroelectric, and other power plants that meet base demand for electricity, and natural gas-fired power plants that meet fluctuating demand, and will require limiting (curbing) the output of green electricity.

[0007] To achieve carbon neutrality by 2050, new mechanisms are needed that not only directly curb GHG emissions but also contribute to the stabilization of the power grid and are economical.

[0008] The present invention has been made to solve the problems (issues) associated with the above-mentioned conventional technologies, and aims to provide an electricity trading system and method that exchanges fossil fuel-derived electricity, which generates GHGs (greenhouse gases) but can guarantee the necessary amount of electricity to be generated when needed, with green electricity, which does not generate GHGs but cannot guarantee the necessary amount of electricity to be generated when needed, and establishes an economically equivalent exchange by adjusting the economic value difference that becomes apparent as the exchange ratio using the amount of electricity generated by the green electricity, thereby resulting in a GHG reduction effect. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems and achieve the object, the present invention provides an energy trading system having a consumer device owned by a consumer, a power generation company device that controls a fossil fuel-derived power generation device that generates electricity derived from fossil fuels, and a management device that manages a green power generation device that generates green electricity obtained from renewable energy and an electricity storage device that stores the electricity generated by the green power generation device, wherein the management device includes an issuance processing unit that, when receiving a valuable asset as payment for an amount of electricity from the consumer device, issues electricity asset certificate information to guarantee the supply of a first amount of electricity corresponding to the valuable asset, and, when receiving a discharge request for the first amount of electricity based on the electricity asset certificate information from the consumer device, if an amount of electricity equal to or greater than the first amount of electricity has been stored in the electricity storage device, issues the green electricity of the first amount of electricity stored in the electricity storage device. a first control unit that controls the power storage device to supply green power to the power grid when a discharge request for the first amount of power based on the power asset certificate information is received from the consumer device, and if the amount of power of the first amount of power is not stored in the power storage device, instructs the power generation company device to supply green power of a second amount of power stored in the power storage device to the power grid and to supply fossil fuel-derived power of an amount of power that is a shortage, which is the difference between the first amount of power and the second amount of power, from the power generation company device to the power grid as an alternative; and a third control unit that controls the power storage device and / or the green power generation device to return to the power generation company device the green power that corresponds to the amount of power that is stored in the power storage device when the green power of the amount of power that is a shortage and that is supplied to the power grid from the power generation company device as an alternative is stored in the power storage device.

[0010] Furthermore, in the above invention, the present invention is characterized in that the electric power asset certificate information has a value storage function for storing the value of the amount of electric power equivalent to the valuable asset, a function for exchanging it for the valuable asset, and a value scale function for indicating the scale of the value of the amount of electric power, and is information that can be used as a symbol equivalent to currency on a specified network.

[0011] Furthermore, in the above invention, the present invention is characterized in that the management device further includes a fourth control unit that controls the power storage device and / or the green power generation device to return a differential power amount that is the difference between the economic value of the first amount of fossil fuel-derived electricity and the economic value of the second amount of electricity generated by the fossil fuel-derived power generation device when the economic value of the first amount of fossil fuel-derived electricity generated by the fossil fuel-derived power generation device exceeds the economic value of the second amount of electricity generated by the green power generation device, resulting in a premium state for fossil fuel-derived electricity.

[0012] In addition, in the above invention, the present invention is characterized in that when the issuance processing unit receives the valuable asset from the consumer device, it issues the power asset certificate information that guarantees the supply of an amount of electricity equivalent to the valuable asset, even if the storage device does not store the green electricity equivalent to the valuable asset.

[0013] The present invention is characterized in that the green electricity in the above invention is electricity obtained from renewable energy sources such as solar power, wind power, hydropower, geothermal power, and biomass.

[0014] The present invention also provides an energy trading method in an energy trading system having a consumer device owned by a consumer, a power generation company device that controls a fossil fuel-derived power generation device that generates electricity derived from fossil fuels, and a management device that manages a green power generation device that generates green electricity obtained from renewable energy and an electricity storage device that stores the electricity generated by the green power generation device, the method including the steps of: when the management device receives a valuable asset as payment for an amount of electricity from the consumer device, issuing power asset certificate information for guaranteeing the supply of a first amount of electricity corresponding to the valuable asset; and when the management device receives a discharge request for the first amount of electricity based on the power asset certificate information from the consumer device, if an amount of electricity equal to or greater than the first amount of electricity has been stored in the electricity storage device, issuing the green electricity of the first amount of electricity stored in the electricity storage device to the energy trading system. a second control step of instructing the power generation company device to supply green power of a second amount of power stored in the storage device to the power grid when a discharge request for the first amount of power based on the power asset certificate information is received from the consumer device and, if the first amount of power is not stored in the storage device, to supply green power of a second amount of power stored in the storage device to the power grid and to supply fossil-derived power of an amount of power that is a shortage, which is the difference between the first amount of power and the second amount of power, from the power generation company device to the power grid as an alternative; and a third control step of controlling the storage device and / or the green power generation company device to return to the power generation company device the green power corresponding to the amount of power that is stored in the storage device, if the green power of the amount of power that is a shortage and that has been alternatively supplied from the power generation company device to the power grid is stored in the storage device. [Effects of the Invention]

[0015] According to the present invention, it is possible to reduce GHG emissions at power generation companies that use fossil fuel-based electricity, and to contribute to reducing GHG emissions in the entire power system, while also producing economic benefits. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a diagram illustrating an overview of an energy trading system according to the first embodiment. [Figure 2] FIG. 2 is a system configuration diagram of the energy trading system shown in FIG. [Figure 3] FIG. 3 is an explanatory diagram for explaining the PVC purchase shown in FIG. [Figure 4] FIG. 4 is an explanatory diagram for explaining the power procurement (PVC discharge request) shown in FIG. [Figure 5] FIG. 5 is an explanatory diagram for explaining the power return shown in FIG. [Figure 6] FIG. 6 is a functional block diagram showing the configuration of the management device shown in FIG. [Figure 7] FIG. 7 is a diagram showing an example of the PVC data shown in FIG. [Figure 8] FIG. 8 is a diagram illustrating an example of the power storage device capacity data illustrated in FIG. [Figure 9] FIG. 9 is a diagram illustrating an example of the returned energy data illustrated in FIG. [Figure 10] FIG. 10 is a functional block diagram showing the configuration of the demander device shown in FIG. [Figure 11] FIG. 11 is a functional block diagram showing the configuration of the retailer device shown in FIG. [Figure 12] FIG. 12 is a functional block diagram showing the configuration of the power generation company device shown in FIG. [Figure 13] FIG. 13 is a sequence diagram showing the procedure for purchasing a PVC in the energy trading system. [Figure 14] FIG. 14 is a sequence diagram showing the procedure for processing power procurement (PVC discharge request) in the power trading system. [Figure 15] FIG. 15 is a sequence diagram showing the procedure for returning electricity in the energy trading system. [Figure 16] FIG. 16 is a functional block diagram illustrating a configuration of a management device of an energy trading system according to the second embodiment. [Figure 17] FIG. 17 is a diagram illustrating an example of the returned energy data illustrated in FIG. [Figure 18]FIG. 18 is a diagram illustrating an outline (part 1) of an energy trading system according to the third embodiment. [Figure 19] FIG. 19 is a diagram illustrating an outline (part 2) of an energy trading system according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] An embodiment of an energy trading system and an energy trading method according to the present invention will be described in detail below with reference to the drawings. The energy trading system according to the present invention is a system for trading the value of electricity, rather than for trading the wheeling of electricity.

[0018] [Embodiment 1] An overview of the energy trading system according to the present embodiment 1 will be described. Fig. 1 is a diagram showing an overview of the energy trading system according to the embodiment 1. As shown in Fig. 1, the energy trading system is a system between a consumer C (Consumer), a retailer PR (Power Retailer), a power bank PB (Power Bank), and a power generation company FFPP (Fossil Fuel Power Plant), in which, when a valuable asset (an asset with a certain fixed price, shown as "payment" in the figure) is received from the consumer C, the power bank PB issues power asset certificate information (hereinafter referred to as "PVC") that guarantees the supply of an amount of power equivalent to the valuable asset (confers power convertibility), and electricity is traded via the PVC. Here, PVCs that have been granted electricity convertibility add a new function of preserving nominal value in kWh ((3) value preservation function) to the (1) value scale function and (2) exchange function that electricity already traded on the market possesses, realizing the three requirements for the establishment of currency (1, 2, 3) and being information that can be used as a "monetary-like representation" on a specified network. Here, although PVC is not "legal tender recognized by law as legal tender," it meets the three requirements for currency, and so is described as a "representation similar to currency" to avoid confusion with legal tender.

[0019] The consumer C has a consumer device 50, and the retailer PR has a retailer device 60. The power bank PB has a management device 20, a power storage device 30, and a green power generation device 40. The power storage device 30 is a device that stores the electricity generated by the green power generation device 40. The green power generation device 40 is a power generation device that generates electricity using renewable energy. The power generation company FFPP has a power generation company device 70, which is connected to a power generation company device (not shown) that generates fossil fuel-derived electricity derived from fossil fuels.

[0020] When consumer C purchases a PVC, consumer C transmits a PVC purchase request from consumer device 50 to retailer device 60 of retailer PR, and when purchasing, for example, 10 kWh of PVC, consumer C pays retailer PR the purchase price priced to reflect the prevailing electricity market conditions at the time of purchase. When retailer device 60 receives the PVC purchase request from consumer C, retailer device 60 places an order for the PVC with management device 20 of power bank PB based on the PVC purchase request from consumer C, and pays the price to power bank PB. In response to the order from retailer PR, power bank PB issues a PVC in management device 20, and the issued PVC is sent to consumer device 50 of consumer C via retailer device 60 of retailer PR.

[0021] Here, the total amount of PVC issued by the power bank PB does not need to be limited to the amount of electricity stored in the power storage device stored by the power bank PB or the maximum capacity of the power storage device (rated capacity, effective capacity, etc.), and can be set, for example, based on (1) the total amount of electricity that the power bank PB's green electricity generation device 40 can generate within a specified future period, (2) the total amount of green electricity that can be procured based on a supply contract with other power generation companies or power storage companies within a specific future period, or the combined power of (1) and (2).

[0022] Furthermore, when a power bank PB issues a PVC, the PVC can be issued even if the total amount of electricity stored in the power storage devices owned by the power bank PB at the time the power bank PB issues the PVC is smaller than the amount of electricity in the PVC to be issued.

[0023] When consumer C procures power using a PVC, consumer C transmits a power procurement request (PVC discharge request) from consumer device 50 to retailer device 60 of retailer PR. When retailer PR receives the PVC discharge request from consumer device 50, it transmits the PVC discharge request from retailer device 60 to management device 20 of power bank PB. When management device 20 of power bank PB receives the PVC discharge request from retailer device 60, it notifies power generation company device 70 of power generation company FFPP of an instruction to supply alternative fossil fuel-derived power equivalent to the PVC, and the power generation company FFPP supplies fossil fuel-derived power equivalent to the PVC to the power grid.

[0024] When the power bank PB instructs the power generation company FFPP to supply fossil fuel-derived electricity instead, the power bank PB notifies the power generation company FFPP of supply information, including the due date for returning the amount of green electricity equivalent to the economic value of the alternatively supplied electricity. Furthermore, once the power generation company FFPP supplies fossil fuel-derived electricity to the power grid, the power bank PB amortizes the corresponding PVC. Once the power generation company FFPP supplies fossil fuel-derived electricity to the power grid, the power generation company device 70 transmits data on the amount of alternatively supplied electricity to the power bank PB's management device 20. It is also anticipated that the power bank PB will deposit a security deposit equivalent to the economic value of the alternatively supplied electricity to the power generation company FFPP prior to the alternative supply.

[0025] When the management device 20 of the power bank PB receives data on the amount of alternative power supply from the power generation company device 70 of the power generation company FFPP, it instructs the green power generation device 40 to generate power and stores the power generated by the green power generation device 40 in the power storage device 30. The management device 20 monitors the amount of power stored in the power storage device 30, and when the due date for returning the alternative power to the power generation company FFPP arrives, the management device 20 instructs the power storage device 30 to supply the amount of green power equivalent to the alternative power supply to the power grid. When the management device 20 of the power bank PB has supplied the amount of green power equivalent to the alternative power supply to the power grid, it sends a return completion notice to the power generation company device 70. Furthermore, when the power generation company FFPP receives the return completion notice, it remits the security money to the power bank PB, if any.

[0026] In this way, in the electricity trading system of the present invention, the power bank PB issues a PVC that guarantees the supply of electricity indefinitely, and when consumer C makes a discharge request using the PVC, the power bank PB responds to the discharge request by instructing the power generation company FFPP to supply fossil fuel-derived electricity to the power grid instead.The power bank PB then generates and stores green electricity and returns the substituted fossil fuel-derived electricity as green electricity, thereby making it possible to convert the power generation company FFPP's fossil fuel-derived electricity to green electricity.

[0027] Furthermore, in the energy trading system of the present invention, PVCs are given the properties of virtual currency, so that issued PVCs are expected to maintain a certain balance like ordinary savings accounts, and the electric power bank PB can invest the valuable assets it received at the time of issuance of the PVCs in the financial market and earn financial income such as interest.

[0028] <System configuration diagram of the energy trading system> Next, a system configuration diagram of the energy trading system of embodiment 1 will be described. Fig. 2 is a system configuration diagram of the energy trading system shown in Fig. 1. As shown in Fig. 2, the energy trading system includes a management device 20 of an energy bank PB, a consumer device 50 of a consumer C, a retailer device 60 of a retailer PR, and a power generation company device 70 of a power generation company FFPP, and the management device 20, the consumer device 50, the retailer device 60, and the power generation company device 70 are connected to a network N.

[0029] In addition, in order to briefly explain the system configuration, Figure 2 only shows the minimum number of devices connected to the network N, but there are multiple devices equivalent to the management device 20, consumer device 50, retailer device 60, and power generation company device 70 owned by businesses not appearing in Figure 2, and it is also possible that the power bank PB, consumer C, retailer PR, and power generation company FFPP appearing in Figure 2 may temporarily or permanently borrow some or all of the devices owned by other businesses and perform the functions caused by those devices on their behalf.

[0030] The management device 20 is connected to a power storage device 30 and a green power generation device 40. Furthermore, a power generation company device 70 is connected to a fossil fuel-derived power generation device 73 that generates electricity derived from fossil fuels. The power system PG is connected to the power storage device 30 of the power bank PB, a factory 59 of a consumer C, and the fossil fuel-derived power generation device 73 of the power generation company FFPP. ​​Here, the location where consumer C receives power is the factory 59, but it may also be an ordinary home, office building, or the like that consumes power.

[0031] The management device 20 performs processes such as receiving an order for a PVC, issuing a PVC, receiving a discharge request using a PVC, instructing the supply of fossil fuel-derived electricity, instructing the generation of electricity using a green electricity generation device 40, monitoring the amount of stored electricity, and instructing the return of green electricity.

[0032] The consumer device 50 performs processes such as processing a purchase request for PVC, receiving PVC data, and requesting power supply using PVC. The retailer device 60 performs processes such as processing an order for PVC, placing an order for PVC, receiving PVC data, and transmitting PVC data. The power generation company device 70 performs processes such as instructing the supply of fossil fuel-derived power, returning green power, and processing the receipt and payment of security deposits.

[0033] <Overview of PVC Purchase> Next, the overview of PVC purchase in the power trading system will be described. FIG. 3 is an explanatory diagram for explaining the PVC purchase shown in FIG. 1. As shown in FIG. 3, the consumer device 50 of the consumer C transmits a purchase request for PVC including data on the amount of power to be purchased to the retailer device 60 of the retailer PR (S1). The retailer device 60 places an order for PVC based on the purchase request received from the consumer device 50 with the management device 20 of the power bank PB (S2).

[0034] When the management device 20 of the power bank PB receives the order data for PVC, it generates (issues) PVC (S3). Specifically, it issues the PVC data of the desired purchase power amount included in the order data and encrypts it using encryption technology such as a private key so that the data content is not tampered with. The management device 20 transmits the issued PVC data to the retailer device 60 (S4).

[0035] When the retailer device 60 receives the PVC data from the management device 20, it transmits the PVC data to the consumer device 50 (S5). The consumer device 50 receives the PVC data from the retailer device 60 (S6) and completes the purchase of PVC.

[0036] When the consumer C purchases PVC, unit price information of PVC is required in advance. The unit price information has two methods: the method of continuous distribution by the power bank PB (exchange method) and the method in which the retailer PR presents the price to the consumer C each time based on the request from the consumer C (quote method). In the case of the quote method, before the retailer PR presents the price to the consumer C, it is necessary to inquire the power bank PB about the unit price information.

[0037] <Overview of PVC Discharge Requirements Next, an overview of the PVC discharge requirements of the power trading system will be described. FIG. 4 is an explanatory diagram for explaining the power procurement (PVC discharge requirements) shown in FIG. 1. As shown in FIG. 4, the consumer C transmits PVC discharge requirement data from the consumer device 50 to the retailer device 60 (S7). If the retailer device 60 of the retailer PR receives the PVC discharge requirement data from the consumer device 50, it transmits the PVC discharge requirement data to the management device 20 of the power bank PB (S8).

[0038] If the management device 20 receives the PVC discharge requirement data from the retailer device 60, it notifies the power generation company device 70 of the power generation business operator FFPP, which has a pre-contracted agreement, of an instruction to supply fossil fuel-derived power (S9). If the power generation company device 70 receives the instruction to supply fossil fuel-derived power, it supplies the fossil fuel-derived power included in the power supply instruction from the fossil fuel-derived power generation device 73 to the power grid (S1).

[0039] <Overview of Return of Alternative Power Next, the return of the power supplied by the power bank PB to the power generation company FFPP will be described. FIG. 5 is an explanatory diagram for explaining the power return shown in FIG. 1. As shown in FIG. 5, the management device 20 of the power bank PB notifies the green power generation device 40 connected to the management device 20 of a power generation instruction (S11). Here, the green power generation device 40 stores the power generated by turning on a charge controller or the like included in the green power generation device 40 in the power storage device 30.

[0040] The management device 20 monitors the power storage amount of the power storage device 30, and when the return date of the power supplied as an alternative arrives, it returns and supplies green power corresponding to the economic value of the fossil fuel-derived power supplied as an alternative from the power storage device 30 to the power grid (S12). If the return supply of the green power is completed, the management device 20 transmits a return completion notice of the green power to the power generation company device 70 (S13). The power generation company device 70 receives the return completion notice of the green power (S14).

[0041] In this way, in the energy trading system according to the present invention, PVC purchase request data is transmitted from the consumer device 50 of consumer C to the management device 20 of the power bank PB via the retailer device 60 of the retailer PR, and the management device 20 generates a PVC and transmits it as PVC data to the consumer device 50 via the retailer device 60. When PVC discharge request data is transmitted from the consumer device 50 to the management device 20 via the retailer device 60, the management device 20 notifies the power generation company device 70 of the power generation company FFPP of a power supply instruction, and the power generation company FFPP supplies fossil fuel-derived electricity to the power grid as an alternative. When the management device 20 notifies the power supply instruction, it instructs the green electricity generation device 40 to start power generation and starts storing electricity in the electricity storage device 30.

[0042] When the due date for returning the substituted electricity arrives, management device 20 returns it by supplying green electricity equivalent to the economic value of the substituted fossil fuel-derived electricity to the power grid. Specifically, when green electricity equivalent to the economic value of the fossil fuel-derived electricity supplied by the power generation company FFPP is stored in power storage device 30 and the return deadline included in the returned energy data arrives, management device 20 returns the substituted electricity by supplying green electricity equivalent to the economic value of the substituted energy included in the returned energy data to the power grid. Furthermore, by returning the substituted fossil fuel-derived electricity with green electricity equivalent to its economic value, the fossil fuel-derived electricity can be converted into green electricity.

[0043] <Configuration of management device 20> Next, the configuration of the management device 20 of the power bank PB will be described. Fig. 6 is a functional block diagram showing the configuration of the management device 20 shown in Fig. 2. As shown in Fig. 6, the management device 20 has a communication I / F unit 23, a memory unit 24, and a control unit 25, and is connected to a display unit 21, an input unit 22, a power storage device 30, and a green power generation device 40. The display unit 21 is a display device such as a liquid crystal display that displays various information. The input unit 22 is an input device such as a mouse or keyboard. The communication I / F unit 23 is an interface unit for communicating with the retailer device 60 and the power generation company device 70.

[0044] The power storage device 30 is a device that stores green power generated by a green power generation device 40 that generates power using renewable energy or nuclear energy such as atomic energy or nuclear fusion. The power storage device 30 is, for example, a lithium-ion battery or a NAS battery. The green power generation device 40 is a device that generates renewable energy. For example, it is a solar power generation device or a wind power generation device.

[0045] The storage unit 24 is a storage device such as a hard disk drive or a nonvolatile memory, and stores PVC data 24a, stored power amount data 24b, and returned power amount data 24c.

[0046] The PVC data 24a is data on the PVC issued by the power bank PB. For example, as shown in FIG. 7, the data includes a date, a PVC identifier (PVCID), an amount of power, an amortization flag, and the like. In this example, the date "2024 / 5 / 10" is associated with a PVCID "PVC000012," an amount of power (kWh) "10," and an amortization flag "0." The date "2024 / 5 / 10" is associated with a PVCID "PVC000013," an amount of power (kWh) "20," and an amortization flag "0." The date "2024 / 5 / 11" is associated with a PVCID "PVC000014," an amount of power (kWh) "50," and an amortization flag "0." Note that the amortization flag of the PVC data 24a is set to "1" when a PVC discharge request is received from a consumer and power is supplied.

[0047] The stored power amount data 24b is data on the amount of stored power of the power storage device 30. For example, as shown in Fig. 8, this data is data such as date, time, and stored power amount (kWh). Here, the date "2 / 24" is associated with the time "10:00" and the stored power amount (kWh) "0.7", the date "2 / 24" is associated with the time "10:10" and the stored power amount (kWh) "0.72", and the date "2 / 24" is associated with the time "10:20" and the stored power amount (kWh) "0.75".

[0048] The returned energy data 24c is data when a power generation company FFPP supplies fossil fuel-derived electricity instead. For example, as shown in Fig. 9, it is data such as date, company, returned energy (kWh), and return deadline. Here, the date "February 22nd" is associated with the company name "Power A," the returned energy (kWh) "100," and the return deadline "March 7th, 10:00," and the date "March 5th" is associated with the company "Power B," the returned energy (kWh) "50," and the return deadline "March 14th, 10:00."

[0049] The control unit 25 is a control unit that performs overall control of the management device 20, and has an order processing unit 25a, a PVC issuance processing unit 25b (corresponding to the "issuing unit" in the claims), a discharge request processing unit 25c, a power supply instruction unit 25d (corresponding to the "fossil fuel derived power supply instruction unit" in the claims), a power generation instruction unit 25e, a stored power amount monitoring processing unit 25f (corresponding to the "monitoring unit" in the claims), and a green power return instruction unit 25g. In practice, by loading and executing these programs into a CPU, the order processing unit 25a, the PVC issuance processing unit 25b, the discharge request processing unit 25c, the power supply instruction unit 25d, the power generation instruction unit 25e, the stored power amount monitoring processing unit 25f, and the green power return instruction unit 25g are caused to execute processes corresponding to the order processing unit 25a, the PVC issuance processing unit 25b, the discharge request processing unit 25c, the power supply instruction unit 25d, the power generation instruction unit 25e, the stored power amount monitoring processing unit 25f, and the green power return instruction unit 25g, respectively.

[0050] The order receiving processing unit 25a is a processing unit that receives PVC order data transmitted from the retailer device 60. The PVC issuance processing unit 25b is a processing unit that issues a PVC based on the order data and transmits it to the retailer device 60. The issued PVC is stored in the storage unit 24 as PVC data 24a.

[0051] The discharge request processing unit 25c is a processing unit that receives a PVC discharge request transmitted from the consumer device 50 via the retailer device 60, and acquires the power amount data included in the PVC discharge request.

[0052] The power supply instruction unit 25d is a processing unit that notifies the power generation company FFPP of a fossil fuel-derived power supply instruction, receives a notification of completion of supply of alternative power sent from the power generation company FFPP, and amortizes the PVC. Specifically, it notifies the power generation company FFPP of a power supply instruction based on the power amount data acquired by the discharge request processing unit 25c. Here, the power supply instruction also includes the amount of return power that the green power generation device 40 of the power bank PB will generate in the future, which has been agreed upon with the power generation company FFPP, and the return deadline calculated based on the amount of return power.

[0053] Thereafter, the power supply instruction unit 25d receives a notification of completion of supply of the alternative power transmitted from the power generation company FFPP, and performs a predetermined PVC amortization process. Specifically, when the power supply instruction unit 25d receives a notification of completion of supply of the alternative power from the power generation company device 70, the power supply instruction unit 25d sets to "1" a return flag of data corresponding to the PVCID included in the PVC discharge request from the consumer device 50, among the data in the PVC data 24a.

[0054] Here, we have explained the case where the power supply instruction unit 25d performs PVC amortization processing by setting the amortization flag of the PVC data 24a to "1," but the PVC may also be amortized by deleting data from the PVC data 24a that corresponds to the PVCID included in the PVC discharge request from the consumer device 50.

[0055] The power generation instruction unit 25e performs processing to instruct the green power generation device 40 to start power generation. Specifically, when the management device 20 receives a notification of completion of supply of substitute power from the power generation business operator device 70, the power generation instruction unit 25e notifies the green power generation device 40 of an instruction to start power generation in order to generate the returned amount of power.

[0056] The stored power amount monitoring processing unit 25f performs processing to monitor the stored power amount of the power storage device 30. Specifically, the stored power amount monitoring processing unit 25f reads data on the stored power amount of the power storage device 30 at specific time intervals, and monitors whether or not the storage of the returned power amount has been completed.

[0057] The green power return instruction unit 25g issues an instruction to return the returned amount of energy. Specifically, when the amount of energy stored in the energy storage device 30 is equal to or greater than the returned amount of energy and the deadline for returning the energy to the power generation company FFPP has arrived, the green power return instruction unit 25g instructs the energy storage device 30 to supply green power to the power grid, and after discharging the returned amount of energy, transmits a green power return completion notification to the power generation company device 70.

[0058] <Configuration of consumer device 50> Next, the configuration of the consumer device 50 of the energy trading system will be described. Fig. 10 is a functional block diagram showing the configuration of the consumer device 50 shown in Fig. 2. As shown in Fig. 10, the consumer device 50 has a display unit 51, an input unit 52, a communication I / F unit 53, a memory unit 54, and a control unit 55. The display unit 51 is a display device such as a liquid crystal display that displays various information. The input unit 52 is an input device such as a mouse or keyboard. The communication I / F unit 53 is an interface unit for communicating with the retailer device 60.

[0059] The storage unit 54 is a storage device such as a hard disk drive or nonvolatile memory, and stores PVC data 54a, which is data of the PVC received from the retailer device 60.

[0060] The control unit 55 is a control unit that controls the entire consumer device 50, and has a purchase processing unit 55a, a PVC data reception processing unit 55b, and a discharge request processing unit 55c. In practice, by loading and executing these programs into the CPU, the purchase processing unit 55a, the PVC data reception processing unit 55b, and the discharge request processing unit 55c will execute processes corresponding to them, respectively.

[0061] The purchase processing unit 55a transmits PVC purchase request data from the consumer device 50 to the retailer device 60. The PVC data reception processing unit 55b receives the PVC data transmitted from the retailer device 60 and stores it as PVC data 54a in the memory unit 54. When a consumer wishes to receive a power supply, the discharge request processing unit 55c transmits discharge request data including the PVC data 54a to the retailer device 60.

[0062] <Configuration of Retailer Device 60> Next, the configuration of the retailer device 60 of the energy trading system will be described. Fig. 11 is a functional block diagram showing the configuration of the retailer device 60 shown in Fig. 2. As shown in Fig. 11, the retailer device 60 has a communication I / F unit 63, a memory unit 64, and a control unit 65, and is connected to a display unit 61 and an input unit 62. The display unit 61 is a display device such as a liquid crystal display that displays various information. The input unit 62 is an input device such as a mouse or keyboard. The communication I / F unit 63 is an interface unit for communicating with the management device 20 and the consumer device 50.

[0063] The storage unit 64 is a storage device such as a hard disk drive or nonvolatile memory, and stores order data 64a and PVC data 64b. The order data 64a is data of a PVC purchase request received from the consumer device 50. The PVC data 64b is data of the PVC transmitted from the management device 20.

[0064] The control unit 65 is a control unit that controls the entire retailer device 60, and has an order receiving processing unit 65a, an order placing processing unit 65b, a PVC data receiving processing unit 65c, a PVC data transmission processing unit 65d, and a discharge request processing unit 65e. In practice, by loading and executing these programs into the CPU, the order receiving processing unit 65a, the order placing processing unit 65b, the PVC data receiving processing unit 65c, the PVC data transmission processing unit 65d, and the discharge request processing unit 65e will execute the processes corresponding to them, respectively.

[0065] The order receiving processing unit 65a receives purchase request data from the consumer device 50 and stores it as order receiving data 64a in the memory unit 64. The ordering processing unit 65b transmits PVC ordering data to the management device 20 based on the order receiving data 64a. The PVC data receiving processing unit 65c receives the PVC data transmitted from the management device 20 and stores it in the memory unit 64 as PVC data 64b.

[0066] The PVC data transmission processing unit 65d transmits the PVC data 64b to the customer device 50. The discharge request processing unit 65e receives PVC discharge request data including the PVC data 54a from the customer device 50 and transmits the PVC discharge request data to the management device 20.

[0067] <Configuration of the power generation company device 70> Next, the configuration of the power generation company device 70 of the energy trading system will be described. Fig. 12 is a functional block diagram showing the configuration of the power generation company device 70 shown in Fig. 2. As shown in Fig. 12, the power generation company device 70 has a communication I / F unit 74, a storage unit 75, and a control unit 76, and is connected to a display unit 71, an input unit 72, and a fossil fuel-based power generation device 73.

[0068] The display unit 71 is a display device such as a liquid crystal display that displays various information. The input unit 72 is an input device such as a mouse or keyboard. The fossil fuel-derived power generation device 73 is a power generation device that generates electricity derived from fossil fuels. The communication I / F unit 74 is an interface unit for communicating with the management device 20.

[0069] The storage unit 75 is a storage device such as a hard disk drive or a nonvolatile memory, and stores the substitute power amount data 75a. The substitute power amount data 75a is data on the amount of power included in the power supply instruction received from the management device 20 of the power bank PB.

[0070] The control unit 76 is a control unit that performs overall control of the power generation company device 70, and has a power supply instruction processing unit 76a and a power return processing unit 76b. In practice, these programs are loaded into the CPU and executed, causing the power supply instruction processing unit 76a and the power return processing unit 76b to execute processes corresponding to each other.

[0071] The power supply instruction processing unit 76a receives a power supply instruction transmitted from the management device 20 of the power bank PB and stores it as alternative power amount data 75a in the memory unit 75. The power supply instruction processing unit 76a issues an instruction to the fossil fuel-derived power generation device 73 connected to the power generation company device 70 to supply the alternative power amount of fossil fuel-derived power to the power grid. Once the fossil fuel-derived power has been supplied, the power supply instruction processing unit 76a transmits an alternative power supply completion notification to the management device 20.

[0072] When a green power return completion notification is sent from the management device 20 of the power bank PB, the power return processing unit 76b receives the return completion notification and deletes the corresponding data from the substitution power amount data 75a. Note that when a green power return completion notification is sent from the management device 20 of the power bank PB, the power return processing unit 76b may receive the return completion notification and add a return flag to the corresponding data in the substitution power amount data 75a.

[0073] <PVC purchasing procedure for the energy trading system> Next, the processing procedure for PVC purchase in the energy trading system will be described. Fig. 13 is a sequence diagram showing the processing procedure for PVC purchase in the energy trading system. As shown in Fig. 13, the consumer device 50 transmits PVC purchase request data to the retailer device 60 (step S101). Upon receiving the PVC purchase request data (step S102), the retailer device 60 transmits the PVC purchase request data to the management device 20 as order data (step S103).

[0074] When the management device 20 receives the order data (step S104), it generates a PVC corresponding to the amount of power requested for the PVC purchase included in the order data (step S105). Then, the management device 20 transmits the PVC data to the retailer device 60 (step S106). The retailer device 60 receives the PVC data from the management device 20 (step S107) and transmits the PVC data to the consumer device 50 (step S108). The consumer device 50 receives the PVC data transmitted from the retailer device 60 (step S109).

[0075] <Processing procedure for discharge requests in the energy trading system> Next, the procedure for processing a discharge request in the energy trading system will be described. Fig. 14 is a sequence diagram showing the procedure for processing a discharge request in the energy trading system. As shown in Fig. 14, when a consumer C requests power to be supplied using a PVC, the consumer device 50 transmits PVC discharge request data to the retailer device 60 (S201). In this case, the PVC discharge request data includes the PVC data that has been purchased in advance.

[0076] The retailer device 60 receives PVC discharge request data from the consumer device 50 (step S202) and transmits the PVC discharge request data to the management device 20 (step S203). The management device 20 receives the PVC discharge request data from the retailer device 60 (step S204). Then, the management device 20 creates a power supply instruction to supply the requested amount of power to the consumer C, and notifies the power generation company device 70 of the power supply instruction (step S205).

[0077] The power generation company device 70 receives the power supply instruction from the management device 20 (step S206). Then, the power generation company device 70 notifies the fossil fuel power generation device 73 connected to the power generation company device 70 of an instruction to supply the amount of power included in the power supply instruction to the power grid (step S207). When the power supply from the fossil fuel power generation device 73 to the power grid is completed, the power generation company device 70 transmits an alternative power supply completion notification to the management device 20 (step S208).

[0078] The management device 20 receives the notification of completion of alternative power supply from the power generation company device 70 (step S209), and amortizes the PVC corresponding to the PVC data included in the PVC discharge request data (step S210). Specifically, the management device 20 sets the amortization flag for the corresponding data in the PVC data 24a to, for example, "1."

[0079] <Power return processing procedure for the energy trading system> Next, the procedure for returning electricity in the energy trading system will be described. Fig. 15 is a sequence diagram showing the procedure for returning electricity in the energy trading system. As shown in Fig. 15, when the energy bank PB discharges the returned amount of electricity, the management device 20 of the energy bank PB issues a power generation instruction to the green electricity generation device 40 (step S301), and stores the generated green electricity in the electricity storage device 30.

[0080] Then, the management device 20 determines whether or not the returned amount of energy has been stored in the energy storage device 30 (step S302). If the returned amount of energy has not been stored (step S302: No), the management device 20 waits until the returned amount of energy can be stored. If the returned amount of energy has been stored (step S302: Yes), the management device 20 determines whether or not the specified return deadline has arrived (step S303).

[0081] If the specified return deadline has not yet arrived (step S303: No), the management device 20 waits until the specified return deadline arrives. If the specified return deadline has arrived (step S303: Yes), the management device 20 notifies the power storage device 30 of an instruction to return the returned amount of green power to the power grid (step S304). Once the return of the returned amount of green power to the power grid is complete, the management device 20 transmits a green power return completion notification to the power generation company device 70 (step S305). The power generation company device 70 receives the green power return completion notification from the management device 20 (step S306) and ends the process.

[0082] As described above, in the first embodiment, the energy trading system transmits PVC purchase request data from the consumer device 50 of the consumer C to the management device 20 of the power bank PB via the retailer device 60 of the retailer PR, and the management device 20 generates a PVC and transmits it as PVC data to the consumer device 50 via the retailer device 60. When PVC discharge request data is transmitted from the consumer device 50 to the management device 20 via the retailer device 60, the management device 20 notifies the power generation company device 70 of the power generation company FFPP of a power supply instruction, and the power generation company FFPP supplies fossil fuel-derived electricity to the power grid. After notifying the power supply instruction, the management device 20 instructs the green electricity generation device 40 to start power generation and starts storing electricity in the electricity storage device 30. When the return date arrives, the management device 20 discharges the returned energy to the power grid.

[0083] In the above embodiment 1, the case where consumer C receives a supply of electricity from the purchased PVC by requesting to discharge the PVC has been described, but consumer C may also sell the PVC purchased via retailer PR to power bank PB. Also, the case where consumer C purchases PVC and requests to discharge the PVC via retailer PR has been described, but direct transactions may be conducted between consumer C and power bank PB without going through retailer PR. Also, consumer C may trade PVC directly with other consumers. In this case, it is desirable that a trading market be established where PVC can be traded.

[0084] [Embodiment 2] Incidentally, the energy trading system of the above-mentioned embodiment 1 has been described as being in a case where the economic value of the fossil fuel-derived electricity (alternative electricity) that the energy bank PB receives as an alternative supply from the power generation company FFPP is the same as the economic value of the green electricity (returned electricity) that the energy bank PB returns to the power generation company. However, the energy trading system of embodiment 2 will be described as being in a case where the economic value of the alternative electricity and the economic value of the returned electricity are different.

[0085] Here, the economic value of the alternative electricity is determined based on the cost of generating electricity, the profits of the power generation company, and the power supply capacity that is not affected by time, weather, or region, and the economic value of the returned electricity is determined based on the cost of storing and generating electricity, the profits of the power generation company, and the value of the CO2 reduction effect.

[0086] <Configuration of management device 80> Fig. 16 is a functional block diagram showing the configuration of a management device 80 of an energy trading system according to the second embodiment. Functional units similar to those of the management device 20 shown in Fig. 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in Fig. 16, the management device 80 has a communication I / F unit 23, a storage unit 84, and a control unit 85, and is connected to a display unit 21, an input unit 22, a power storage device 30, and a green power generation device 40. The display unit 21 is a display device such as a liquid crystal display that displays various information. The input unit 22 is an input device such as a mouse or keyboard. The communication I / F unit 23 is an interface unit for communicating with a retailer device 60 and a power generation company device 70.

[0087] The storage unit 84 is a storage device such as a hard disk drive or a nonvolatile memory, and stores the PVC data 24a, the stored power amount data 24b, and the returned power amount data 84a.

[0088] The returned energy data 84a is data for when a power generation company FFPP supplies fossil fuel-derived electricity instead. For example, as shown in FIG. 17, the data includes the date, company, returned energy (kWh), returned energy ratio, and return deadline. Here, the date "February 22" is associated with the company name "Power A," the returned energy (kWh) "100," the returned energy ratio "1.1," and the return deadline "March 7, 10:00," while the date "March 5" is associated with the company "Power B," the returned energy (kWh) "50," the returned energy ratio "1.2," and the return deadline "March 14, 10:00."

[0089] When the return date arrives, the management device 80 supplies the amount of power obtained by multiplying the returned amount of power by the return amount rate to the power grid. For example, if the business operator is Power Company A, the management device 80 supplies 110 kWh of returned power to the power grid on the return deadline, "March 7th, 10:00."

[0090] The control unit 85 is a control unit that performs overall control of the management device 80, and has an order receiving processing unit 25a, a PVC issuance processing unit 25b, a discharge request processing unit 25c, a power supply instruction unit 25d, a power generation instruction unit 25e, a stored power amount monitoring processing unit 25f, a green power return instruction unit 25g, and a returned power amount ratio calculation unit 85a. In practice, by loading and executing these programs into a CPU, the order receiving processing unit 25a, the PVC issuance processing unit 25b, the discharge request processing unit 25c, the power supply instruction unit 25d, the power generation instruction unit 25e, the stored power amount monitoring processing unit 25f, the green power return instruction unit 25g, and the returned power amount ratio calculation unit 85a are caused to execute processes corresponding to the order receiving processing unit 25a, the PVC issuance processing unit 25b, the discharge request processing unit 25c, the power supply instruction unit 25d, the power generation instruction unit 25e, the stored power amount monitoring processing unit 25f, the green power return instruction unit 25g, and the returned power amount ratio calculation unit 85a.

[0091] The returned energy ratio calculation unit 85a is a processing unit that calculates the ratio of the amount of returned energy corresponding to the economic value of the alternative energy based on the economic value of the alternative energy and the economic value of the returned energy. For example, the returned energy ratio calculation unit 85a calculates a value obtained by dividing the economic value of the alternative energy per predetermined unit (e.g., 1 kWh) by the economic value of the returned energy per predetermined unit. If the economic value of the alternative energy per predetermined unit is greater than the economic value of the returned energy per predetermined unit, the returned energy ratio calculation unit 85a calculates the returned energy ratio to be a value greater than 1, and if the economic value of the alternative energy per predetermined unit is less than the economic value of the returned energy per predetermined unit, the returned energy ratio calculation unit 85a calculates the returned energy ratio to be a value less than 1.

[0092] As described above, in the second embodiment, when the economic value of the alternative power that the power bank PB receives from the power generation company FFPP as an alternative is different from the economic value of the green power (returned power) that the power bank PB returns to the power generation company, the energy trading system adjusts the rate of returned power so that the economic value of the returned power is equivalent to the economic value of the alternative power. Specifically, when the economic value of the alternative power is greater than the economic value of the returned power, the energy trading system returns to the power grid an amount of returned power such that the ratio of the returned power to one unit of alternative power is greater than one unit, and when the economic value of the alternative power is less than the economic value of the returned power, the energy trading system returns to the power grid an amount of returned power such that the ratio of the returned power to one unit of alternative power is less than one unit.

[0093] Furthermore, in the electricity trading system of the present invention, the electric power bank PB that receives a PVC discharge request entrusts an alternative supply to an electric power generation company FFPP, which has an electric power supply capacity that is not affected by time, weather, or region, in order to reliably supply the specified discharge amount on the specified discharge date and time. However, in market situations where the economic value of such electric power supply capacity is high, economic equivalent exchange is only established when the electric power generation company FFPP returns and supplies green electricity in an amount that exceeds the alternative supply by α (kWh) (a state in which fossil fuel-derived electricity exceeds the economic value of green electricity). In such a case, α (kWh) of the green electricity returned and supplied to the electric power generation company FFPP will replace fossil fuel-derived electricity in the electric power generation plan of the electric power generation company FFPP with α (kWh) of green electricity, which will ultimately contribute to GHG reduction throughout the entire electric power system.

[0094] Furthermore, in the electricity trading system of the present invention, even when the electric power bank PB generates the excess green electricity, if it uses renewable energy power generation equipment (such as solar, wind, hydroelectric, tidal, geothermal, etc.) whose marginal cost of power generation is considered to be zero, no new costs will be incurred in generating the excess green electricity.

[0095] In the above-described first and second embodiments, the management device 20 instructs the power storage device 30 to return the substitute power by supplying the stored green power to the power grid, but the present invention is not limited to this, and the management device 20 may also instruct the power storage device 30 and / or the green power generation device (40) to return the substitute power.

[0096] [Embodiment 3] Incidentally, in the energy trading systems according to the above-mentioned first and second embodiments, the case where the energy bank PB transmits an instruction to the power generation company FFPP to supply alternative energy when it receives a discharge request from the consumer device 50 has been described. However, in the energy trading system according to the third embodiment, the case where the energy bank PB supplies energy to the power grid from the energy storage device 30 held by the energy bank PB when it receives a discharge request from the consumer device 50 will be described.

[0097] 18 and 19 are diagrams showing an overview of an energy trading system according to embodiment 3. When the energy storage device 30 of the energy bank PB has a stored amount of energy greater than the amount of energy included in the discharge request transmitted from the consumer device 50, the energy bank PB supplies green energy from the energy storage device 30 to the power grid for the entire amount of energy included in the energy request. Note that functional units similar to those in the energy trading system shown in FIG. 2 are denoted by the same reference numerals, and detailed descriptions thereof will be omitted.

[0098] As shown in Figure 18, consumer C transmits discharge request data using PVC from consumer device 50 to retailer device 60 (S21). When retailer device 60 of retailer PR receives the PVC discharge request data from consumer device 50, it transmits the PVC discharge request data to management device 20 of power bank PB (S22).

[0099] When the management device 20 receives the PVC discharge request data from the retailer device 60, it determines whether the amount of stored electricity in the electricity storage device 30 is greater than the amount of power included in the PVC discharge request data, and if the amount of stored electricity is greater than the amount of power included in the PVC discharge request data, it issues a green electricity supply instruction to the electricity storage device 30 (S23).Then, the electricity storage device 30 supplies the stored green electricity to the power grid.

[0100] On the other hand, if the power bank PB's storage device 30 does not have a stored amount of electricity greater than the amount of electricity included in the discharge request sent from the consumer device 50, the power bank PB will supply the green electricity stored in the storage device 30 to the power grid and will issue a power supply instruction to the power generation company FFPP to supply a portion of the electricity amount (the amount of electricity included in the discharge request minus the amount of green electricity that can be supplied from the storage device 30) instead.

[0101] As shown in Figure 19, consumer C transmits discharge request data using PVC from consumer device 50 to retailer device 60 (S31). When retailer device 60 of retailer PR receives the PVC discharge request data from consumer device 50, it transmits the PVC discharge request data to management device 20 of power bank PB (S32).

[0102] When management device 20 receives PVC discharge request data from retailer device 60, it determines whether or not the amount of stored electricity in power storage device 30 is greater than the amount of electricity included in the PVC discharge request data, and if the amount of stored electricity is not greater than the amount of electricity included in the PVC discharge request data, it notifies power storage device 30 of an instruction to supply green electricity (S33) and notifies power generation company FFPP of an instruction to supply fossil fuel-derived electricity for some of the amount of electricity (S34).When power generation company device 70 receives the instruction to supply fossil fuel-derived electricity, it supplies the fossil fuel-derived electricity included in the power supply instruction to the power grid from fossil fuel-derived power generation device 73 (S35).

[0103] As described above, in this embodiment 3, when the power bank PB receives a discharge request from consumer C via retailer PR, if the power storage device 30 has a stored amount of electricity greater than the amount of electricity included in the discharge request, the power bank PB supplies green electricity from the power storage device 30 to the power grid for the entire amount of electricity included in the discharge request, and if the power storage device 30 does not have a stored amount of electricity greater than the amount of electricity included in the discharge request, the power bank PB supplies green electricity from the power storage device 30 to the power grid and instructs the power generation company FFPP to supply a portion of the electricity that is insufficient due to the supply of green electricity instead.

[0104] <Modification> In the above-mentioned first, second and third embodiments, the case where PVC transactions are applied to a server-client model has been described, but the present invention is not limited to this and can also be realized as a distributed system on Ethereum (registered trademark), for example. In this case, it is sufficient to configure each device to automatically execute the transaction using a smart contract (registered trademark).

[0105] In the above embodiment 3, the management device 20 instructs the energy storage device 30 to supply the stored green electricity to the power grid, thereby supplying the amount of electricity included in the discharge request to the power grid. However, the present invention is not limited to this, and the management device 20 may instruct the energy storage device 30 and / or the green electricity generation device (40) to supply the amount of electricity included in the discharge request to the power grid.

[0106] The components illustrated in the above embodiments are merely functional schematics and are not necessarily physically configured as shown. In other words, the distribution and integration of each device is not limited to the illustrated configuration, and all or part of the devices can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc. [Industrial Applicability]

[0107] The energy trading system and method according to the present invention are suitable for GX promotion. [Explanation of symbols]

[0108] 20 Management device 21 Display section 22 Input section 23 Communication I / F section 24 Memory section 24a PVC data 24b Energy storage data 24c Returned Energy Data 25 Control Unit 25a Order Processing Department 25b PVC generation processing section 25c Discharge request processing unit 25d Power supply instruction section 25e Power generation indicator 25f Storage capacity monitoring processing unit 25g Green power return instruction section 30 Energy storage device 40 Green power generation equipment 50 Consumer equipment 51 Display section 52 Input section 53 Communication I / F section 54 Memory section 54a PVC data 55 Control Unit 55a Purchase Processing Department 55b PVC data receiving processing unit 55c Discharge request processing unit 59 Factory 60 Retailer Equipment 61 Display section 62 Input section 63 Communication I / F section 64 Memory section 64a Order Data 64b PVC data 65 Control Unit 65a Order Processing Department 65b Order Processing Unit 65c PVC data receiving processing unit 65d PVC data transmission processing unit 65e Discharge request processing unit 65e 70 Power Generation Equipment 71 Display section 72 Input section 73 Fossil fuel-based power generation equipment 74 Communication I / F section 75 Memory section 75a Alternative Energy Data 76 Control Unit 76a Power supply instruction processing unit 76b Power return processing section 80 Management device 84 Memory section 84a Returned energy data 85 Control Unit 85a Returned power amount ratio calculation unit C Consumer FFPP power generation company PB Power Bank PR Retailer PVC Power Asset Certificate Information

Claims

1. An electricity trading system having a consumer device (50) owned by a consumer, a power generation company device (70) that controls a fossil fuel-derived power generation device (73) that generates electricity derived from fossil fuel, and a management device (20) that manages a green power generation device (40) that generates green electricity obtained from renewable energy and an electricity storage device (30) that stores the electricity generated by the green power generation device (40), The management device (20) an issuance processing unit that, when receiving a valuable asset as payment for an amount of electricity from the consumer device (50), issues electric power asset certificate information for guaranteeing the supply of a first amount of electricity corresponding to the valuable asset; a first control unit that, when receiving a discharge request for the first amount of power based on the power asset certificate information from the consumer device (50), if an amount of power equal to or greater than the first amount of power is stored in the power storage device (30), controls the green power of the first amount of power stored in the power storage device (30) to be supplied to the power grid; a second control unit that, when receiving a discharge request for the first amount of power based on the power asset certificate information from the consumer device (50), if the first amount of power is not stored in the power storage device (30), supplies green power of a second amount of power stored in the power storage device (30) to the power grid, and instructs the power generation company device (70) to alternatively supply fossil-derived power to the power grid in an amount of power shortage that is the difference between the first amount of power and the second amount of power; a third control unit that controls the power storage device (30) and / or the green power generation device (40) so that, when the green power corresponding to the amount of power shortage that is alternatively supplied from the power generation company device (70) to the power grid is stored in the power storage device (30), the green power corresponding to the amount of power shortage that is stored in the power storage device is returned to the power generation company device (70); An energy trading system comprising:

2. The power asset certificate information is 2. The energy trading system according to claim 1, wherein the energy trading system has a value storage function for storing the value of the amount of energy equivalent to the valuable asset, a function for exchanging the amount of energy into the valuable asset, and a value scale function for indicating a scale of the value of the amount of energy, and the information is usable as a symbol equivalent to currency on a predetermined network.

3. The management device (20) 2. The energy trading system according to claim 1, further comprising a fourth control unit that controls the power storage device (30) and / or the green power generation device (40) to return a differential energy amount that is a difference between the economic value of the first energy amount and the economic value of the second energy amount when the economic value of the first energy amount derived from fossil fuel generated by the fossil fuel-derived power generation device (73) exceeds the economic value of the second energy amount generated by the green power generation device (40), creating a premium state for fossil fuel-derived electricity.

4. The issuing processing unit The energy trading system of claim 1, characterized in that when the valuable asset is received from the consumer device (50), the energy asset certificate information is issued to guarantee the supply of an amount of electricity equivalent to the valuable asset, even if the energy storage device (30) does not store the green electricity equivalent to the valuable asset.

5. The green power is 5. The energy trading system according to claim 1, wherein the electricity is obtained from renewable energy sources such as solar power, wind power, hydropower, geothermal power, and biomass.

6. An electricity trading method in an electricity trading system having a consumer device (50) owned by a consumer, a power generation company device (70) that controls a fossil fuel-derived power generation device (73) that generates electricity derived from fossil fuel, and a management device (20) that manages a green electricity generation device (40) that generates green electricity obtained from renewable energy and an electricity storage device (30) that stores the electricity generated by the green electricity generation device (40), an issuance processing step in which, when the management device (20) receives a valuable asset as payment for an amount of power from the consumer device (50), the management device (20) issues power asset certificate information for guaranteeing the supply of a first amount of power corresponding to the valuable asset; a first control step of controlling the green power of the first amount of power stored in the power storage device (30) to be supplied to the power grid when a discharge request for the first amount of power based on the power asset certificate information is received from the consumer device (50) and an amount of power equal to or greater than the first amount of power is stored in the power storage device (30); a second control step of supplying green power of a second amount of power stored in the power storage device (30) to the power grid when a discharge request for the first amount of power based on the power asset certificate information is received from the consumer device (50) and the first amount of power is not stored in the power storage device (30), and instructing the power generation company device (70) to supply fossil fuel-derived power of an amount of power shortage, which is the difference between the first amount of power and the second amount of power, to the power grid as an alternative; a third control step of controlling the power storage device (30) and / or the green power generation device (40) so that, when the green power corresponding to the amount of power shortage alternatively supplied from the power generation company device (70) to the power grid is stored in the power storage device (30), the green power corresponding to the amount of power shortage stored in the power storage device is returned to the power generation company device (70); 1. An energy trading method comprising:

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