Power supply system and power supply method

Abstract

To provide a power supply system and a power supply method capable of improving convenience of green power.SOLUTION: A power generation system comprising: a power generation facility configured to generate green electricity from renewable energy; a charging device configured to charge a device configured to operate with a rechargeable battery; and an electric heat utilization process configured to utilize electricity or heat, wherein the charging device is configured to be supplied with only the green electricity generated by the power generation facility, and the charging device is configured to charge the device with the green electricity, wherein heat generated in the power generation facility in association with the generation of the green electricity and surplus electricity of the green electricity generated in the power generation facility other than the electricity supplied to the charging device are supplied to the heat and electricity utilization process.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply system and a power supply method. [Background technology]

[0002] The use of green electricity generated from energy sources such as biomass, solar, wind, geothermal, and small hydropower is effective in reducing carbon emissions from electricity use, but the use of green electricity faces challenges such as the inability to locate power generation facilities adjacent to the point of demand, the small scale of power generation resulting in low efficiency, and the need for additional personnel for power generation. To address these challenges, a green electricity certification system has been put into operation, which transmits generated green electricity to electricity consumers in separate locations via the power company's distribution network, and enables the transfer of ownership of the green electricity value from the generator to the consumer based on the amount of green electricity generated (see, for example, Non-Patent Documents 1 and 2).

[0003] Furthermore, with regard to a biomass power generation plant, which is one method of generating green electricity, Patent Document 1 describes that, with the aim of reducing CO2 emissions, the plant is equipped with a first power generation system that generates electricity by directly burning biomass, and a second power generation system that generates electricity by burning biogas extracted from the biomass before direct combustion, and that the electricity generated by the second power generation system is used to operate the auxiliary equipment of the first power generation system, and that electricity is supplied to energy storage equipment installed in parallel with the power supply system to the auxiliary equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-117732 [Non-patent literature]

[0005] [Non-Patent Document 1] Ryozo Noguchi, Mizuki Koyama, "Possibility of replacing automobile energy with locally recycled biomass energy", Agricultural Information Research 18(3), 2009.142-151 [Non-patent document 2] JQA, Japan Quality Assurance Organization, "Current Status and Future of Green Power Certificates", [online], November 10, 2020, [Retrieved June 10, 2024], Internet<URL:https: / / www.renewable-ei.org / pdfdownload / activities / JQA_201110.pdf> Summary of the Invention [Problem to be solved by the invention]

[0006] However, green power certification has not been widely adopted because the procedures are complicated and consumers cannot directly use green power without including non-green power. Furthermore, the technology in Patent Document 1 consumes energy for the biomass gasification process itself and for removing pollutants during gasification, and the combustion system becomes complicated by requiring two systems, so the utilization efficiency of the energy extracted from biomass is not necessarily high. Thus, in the past, green power was not necessarily easy for electricity consumers to use, and there were cases where it was not possible to sufficiently motivate electricity consumers to use green power.

[0007] Therefore, an object of the present invention is to provide a power supply system and a power supply method that can improve the convenience of green power. [Means for solving the problem]

[0008] One aspect of the present invention is a power supply system comprising a power generation facility that generates green electricity using renewable energy, a charging device that charges equipment powered by a rechargeable storage battery, and an electric heat utilization process that utilizes electricity or heat, wherein the charging device is supplied with only the green electricity generated by the power generation facility, the charging device charges the equipment with the green electricity, and the heat generated in the power generation facility as a result of the generation of the green electricity and surplus electricity from the green electricity generated in the power generation facility other than the electricity supplied to the charging device are supplied to the electric heat utilization process.

[0009] One aspect of the present invention is the above-mentioned power supply system, wherein the power generation facility includes one or more power generation devices that use biomass, solar power, wind power, geothermal power, or small hydropower as an energy source.

[0010] In one aspect of the present invention, in the power supply system described above, the device is a transport machine that moves to an installation location of the charging device and charges the storage battery.

[0011] One aspect of the present invention is the above-mentioned power supply system, wherein the power generation facility comprises a boiler that burns biomass and a first steam turbine power generation device that is driven by high-temperature, high-pressure steam supplied from the boiler, and the charging device is installed outside the installation location of the power generation facility and the electric heat utilization process, and further comprises a first distributor that distributes green electricity generated by the first steam turbine power generation device, one of the distribution lines branched by the first distributor is connected to the charging device, and the other of the distribution lines branched by the first distributor is connected to a distribution network inside the installation location.

[0012] One aspect of the present invention is the above-mentioned power supply system, wherein the first distributor has a backflow prevention function for preventing power from being supplied to the charging device via the power distribution network.

[0013] One aspect of the present invention is the above-mentioned power supply system, further comprising a second steam turbine power generating device that generates power using steam extracted from the first steam turbine power generating device, the first steam turbine power generating device comprising an extraction turbine that extracts steam for the second steam turbine power generating device, and the green power generated by the second steam turbine power generating device is supplied to the charging device.

[0014] One aspect of the present invention is the above-mentioned power supply system, further comprising a steam diversion device that adjusts the amount of steam extracted by the extraction turbine to be sent to the second steam turbine power generation device in accordance with the power demand of the charging device, and supplies surplus steam extracted by the extraction turbine other than the steam sent to the second steam turbine power generation device to the electric heat utilization process.

[0015] One aspect of the present invention is the above-mentioned power supply system, further comprising a second distributor that distributes the green power generated by the second steam turbine power generating device, and transmits surplus green power generated by the second steam turbine power generating device other than the green power sent to the charging device to an internal power distribution network within the installation site.

[0016] One aspect of the present invention is the above-mentioned power supply system, wherein the second distributor has a backflow prevention function for preventing power from being supplied to the charging device via the power distribution network.

[0017] One aspect of the present invention is the power supply system described above, wherein two or more power generation devices are connected to the power distribution network.

[0018] One aspect of the present invention is the power supply system described above, wherein an external power source is connected to the power distribution network.

[0019] One aspect of the present invention is the power supply system described above, wherein the biomass used by the power generation facility to generate green power is black liquor discharged from a pulp cooking process.

[0020] One aspect of the present invention is the power supply system described above, wherein the biomass used by the power generation facility to generate green power is woody biomass.

[0021] One aspect of the present invention is the power supply system described above, wherein the biomass used by the power generation facility to generate green power is simple biomass, waste, or a mixture of biomass and waste.

[0022] One aspect of the present invention is the power supply system described above, wherein the charging device charges the device by high-voltage DC rapid charging.

[0023] One aspect of the present invention is a power supply method using a power supply system that includes a power generation facility that generates green power using renewable energy, a charging device that charges equipment that operates using a rechargeable storage battery, and an electric heat utilization process that utilizes electricity or heat, in which the charging device is supplied with only the green power generated by the power generation facility, the charging device charges the equipment with the green power, and supplies to the electric heat utilization process heat generated in conjunction with the generation of the green power at the power generation facility and surplus green power generated at the power generation facility other than the power supplied to the charging device. [Effects of the Invention]

[0024] As described above, the present invention has the effect of providing a power supply system and a power supply method that can improve the convenience of green power. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a diagram illustrating an example of the overall configuration of a power supply system 1 according to an embodiment. [Figure 2]1 is a diagram showing an example (first mode) of a mode in which a green electricity charging station 60 of an embodiment provides a charging service to a transport machine 80. FIG. [Figure 3] 10 is a diagram showing an example (second mode) of a mode in which a green electricity charging station 60 of the embodiment provides a charging service to a transport machine 80. FIG. [Figure 4] 10 is a diagram showing an example (third aspect) of an aspect in which a green electricity charging station 60 of an embodiment provides a charging service to a transport machine 80. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] [Overall system configuration example] FIG. 1 is a diagram illustrating an example of the overall configuration of a power supply system according to this embodiment. The power supply system 1 includes an on-site system 1A that functions as a power plant and an off-site system 1B that is located at a power demand location. The power supply system 1 includes, for example, a first power generation facility 10, a second power generation facility 20, a power distribution facility 30, a power utilization process 40, a heat utilization process 50, and a green power charging station 60. The first power generation facility 10, the second power generation facility 20, the power distribution facility 30, the power utilization process 40, and the heat utilization process 50 are installed in the on-site system 1A, and the green power charging station 60 is installed in the off-site system 1B. While the example of FIG. 1 illustrates one green power charging station 60, any number of green power charging stations 60 may be installed at any power demand location, and any number of power demand locations may exist. The green power charging station 60 is a device that serves as an interface for supplying power generated by the on-site system 1A to off-site power demand.

[0027] [In-house system configuration] The first power generation facility 10 is a facility that generates green electricity. In this embodiment, the first power generation facility 10 is a biomass power generation facility and includes, for example, a biomass boiler 11, a first power generation device 12, a second power generation device 13, and a steam diversion device 14. The biomass boiler 11 is a boiler that generates steam using heat generated by burning biomass. The first power generation device 12 is a device that generates electricity by converting the energy of the high-temperature, high-pressure steam generated by the biomass boiler 11 into electric power. The first power generation device 12 includes, for example, an extraction turbine 121 and a first generator 122. The extraction turbine 121 is a device that converts steam energy into rotational energy by applying steam discharged from the biomass boiler 11 to an impeller to rotate it. The first power generation device 12 is a device that generates electricity by rotating a motor. The rotating shaft of the impeller is connected to the first generator 122, and the rotational energy of the impeller rotates the motor of the first generator 122, generating electric power.

[0028] Meanwhile, the extraction turbine 121 extracts a portion of the steam supplied from the biomass boiler 11 and supplies it to the second power generation device 13. The second power generation device 13 includes, for example, a microturbine 131 and a second power generator 132. The second power generation device 132 is a generator with a smaller power output than the first power generation device 122, and the microturbine 131 is a turbine designed for generators with a smaller output like the second power generation device 132. Similar to the first power generation device 12, the microturbine 131 of the second power generation device 13 converts the energy of the extracted steam into rotational energy, which then rotates the motor of the second power generation device 132 to generate electric power. The electric power generated by the first power generation device 122 or the second power generation device 132 can be supplied to an electric power utilization process 40 within the power supply system 1 or to an electric power demand external to the power supply system 1. The electric power utilization process 40 may include any electric power demand device, and the external electric power demand may be of any type. Furthermore, the extraction turbine 121 can extract a portion of the steam supplied from the biomass boiler 11 and supply it to a heat utilization process 50 inside the power supply system 1. The heat utilization process 50 may include any heat demand device.

[0029] The steam diverter 14 is a device that adjusts the amount of steam extracted by the extraction turbine 121 to be sent to the second power generation device 13 in accordance with the power demand of the green power charging station 60. This allows surplus steam extracted by the extraction turbine 121 other than the steam to be sent to the second power generation device 13 to be supplied to the heat utilization process 50. The steam diverter 14 is connected to the green power charging station 60 so as to be able to communicate with it, and can timely obtain information on the power demand from the green power charging station 60.

[0030] The second power generation facility 20 is a green power generation facility separate from the first power generation facility 10. In this embodiment, the second power generation facility 20 is a boiler power generation facility that uses renewable energy, and includes, for example, a renewable energy boiler 21 that generates steam by burning renewable fuel such as biomass, and a third power generation unit 22 that generates electricity using the steam generated by the renewable energy boiler 21. The third power generation unit 22 includes a turbine 221 that converts steam energy into rotational energy, and a third power generator 222 that generates electricity using the rotational energy of the turbine 221. The exhaust steam of the turbine 221 is used in the heat utilization process 50. Furthermore, the second power generation facility 20 may include a condensing power generation mechanism 223 in order to match the ratio of power demand to heat demand in the on-site system 1A with the ratio of power demand to heat demand in the entire power generation facility. The condensing power generation mechanism 223 includes a steam dividing device 2231 that divides the steam discharged from the turbine 221 between the heat utilization process 50 and the condensing power generation mechanism 223, a condensing turbine 2232, a condenser 2233, and a fourth generator 2234 that generates electricity using the rotational force of the condensing turbine 2232. When it is desired to increase the ratio of electric power to the total energy output from the second power generation facility 20, the exhaust steam sent from the turbine 221 to the heat utilization process 50 can be diverted to the condensing turbine 2232, and the power generation output of the third power generation device 22 can be increased by the fourth generator.

[0031] The configuration of the second power generation facility 20 shown in FIG. 1 is merely an example. The second power generation facility 20 may be a facility that uses steam generated by a boiler or incinerator that burns only biomass, similar to the first power generation facility 10, as its energy source. Alternatively, the second power generation facility 20 may be a facility that burns waste materials other than biomass or fossil fuels, either singly or in combination with biomass. Furthermore, the second power generation facility may generate green power using methods such as solar power generation, wind power generation, geothermal power generation, and small hydroelectric power generation. Electricity generated by the third generator 222 and the fourth generator 2234 may be supplied to the power utilization process 40 within the power supply system 1. In the power supply system 1, the biomass used to generate green power may be black liquor discharged from the pulp cooking process or woody biomass. The renewable energy used to generate green power may be biomass alone, (combustible) waste, or a mixture of biomass and waste.

[0032] [Configuration of power distribution equipment] The power distribution facility 30 includes, for example, an in-station power distribution network 31, a first power distributor 32, a second power distributor 33, transformers 34A and 34B, a first AD converter 35, and a second AD converter 36. The in-station power distribution network 31 is a facility for distributing power supplied from a power source to power demanding devices within the power supply system 1. More specifically, the in-station power distribution network 31 is connected to the first power generation device 12, the third power generator 222, an external power source 70, and the power utilization process 40, and can supply power supplied from the first power generation device 12, the third power generator 222, and the external power source 70 to the power utilization process 40. The external power source 70 is, for example, a power grid. Alternatively, the external power source 70 may be any power source that can supply power from an external source to the power supply system 1.

[0033] The first distributor 32 is a device that distributes the power output by the first power generation device 12 to the green power charging station 60 of the off-site system 1B. The second distributor 33 is a device that distributes the power output by the second power generation device 13 to the green power charging station 60 of the off-site system 1B. The power distributed by the first distributor 32 and the second distributor 33 is AD converted by a first AD converter 35 and a second AD converter 36, respectively, and supplied to the green power charging station 60. Transformers 34A and 34B are provided between the first distributor 32 and the first AD converter 35, and between the second distributor 33 and the second AD converter 36, for adjusting the voltage supplied to the green power charging station 60 to be within an appropriate range.

[0034] The first distributor 32 of this embodiment is equipped with a "power flow backflow prevention mechanism." If the direction of current flowing from the first power generation device 12 toward the green power charging station 60 is defined as a "forward power flow," and the direction of current flowing from the on-site power distribution network 31 toward the green power charging station 60 is defined as a "reverse power flow," then in a state of reverse power flow, there is a concern that power other than power generated using green energy (green power) such as the external power source 70 may be mixed into the power supplied to the green power charging station 60. In this embodiment, in order to ensure that the green power charging station 60 supplies only green power, the first distributor 32 is equipped with a power flow backflow prevention mechanism as a mechanism for preventing the above-mentioned reverse power flow from occurring. The method for realizing the reverse current prevention mechanism is not limited to a specific one, but examples of the method include a method of opening an AC switch provided in the first distributor 32 when the output of the first power generation device 12 falls below a threshold value, or a method of detecting the current on the first power generation device 12 side (left side in Figure 1) or the in-house power distribution network 31 side (right side in Figure 1) of the first distributor 32, and opening the AC switch provided in the first distributor 32 when the current direction is from left to right.

[0035] [Green energy charging station] As described above, in this embodiment, the green power charging station 60 is a device that serves as an interface for supplying power generated by the on-site system 1A to power demand outside the site. As described above, only power generated by biomass power generation by the first power generation facility 10 is supplied to the green power charging station 60, so it is possible to ensure that users of the green power charging station 60 use only green power. Furthermore, in the power supply system 1 of this embodiment, a backflow prevention mechanism is provided in the first distributor 32 that distributes the power generated by the first power generation facility 10 to the green power charging station 60. This makes it possible to prevent power other than green power (power supplied from the external power source 70 in the example of FIG. 1 ) from flowing into the power intended for the green power charging station 60. Therefore, users who wish to use green power can receive power from the power supply system 1 with peace of mind.

[0036] The green power charging station 60 may provide charging services to users in any manner. For example, the green power charging station 60 may be a "high-voltage DC quick charger" that can provide charging services for large-capacity, high-output electrical equipment. For example, the green power charging station 60 may provide charging services for transportation machinery 80, as shown in FIG. 1. For example, the high-voltage DC quick charger may have a voltage of 350 to 450 V and a maximum output of approximately 400 kW. The high-voltage DC quick charger may be compatible with any quick charging standard. Examples of quick charging standards include CHAdeMO, CCS2, GB / T, and NACS. Depending on the application, the green power charging station 60 may provide charging services using standard charging compatible with a 100 V or 200 V household AC power source.

[0037] 2 to 4 are diagrams showing an example of a mode in which a charging service is provided for a transport machine 80. For example, when a charging service is provided for a transport machine 80, three modes shown in FIGS. 2 to 4 can be given as examples. In the first mode, when the transport machine 80 is an electric vehicle (including a hybrid vehicle), charging is performed to power the transport machine 80 itself. In this case, the green power charging station 60 may be provided with an adapter for connecting the green power charging station 60 to a charging port provided on the transport machine 80. Note that in cases where the transport machine 80 is only compatible with normal charging, the green power charging station 60 may be provided with a normal charging adapter instead of / in addition to a rapid charging adapter.

[0038] In the second aspect, the transport machine 80 is equipped with a rechargeable battery that can be charged at the green power charging station 60, and the rechargeable battery charged at the green power charging station 60 is transported to the destination, where a power supply service is provided using the charged rechargeable battery. In this case, the transport machine 80 may be equipped with a charger 81 for charging the rechargeable battery, and a port or adapter for supplying power from the rechargeable battery to an electricity demanding device. In this case, the green power charging station 60 may also be equipped with an adapter for connecting the device to the charger 81 for charging. In the second aspect, the power supply service can be provided at any location where the transport machine 80 can move, enabling more flexible service provision.

[0039] In the third aspect, the transport machine 80 is equipped with a rechargeable battery that can be charged at the green power charging station 60, and the rechargeable battery charged at the green power charging station 60 is transported to the destination, and the charged rechargeable battery is provided to the user at the destination. In this case, as in the second aspect, the transport machine 80 may be equipped with a charger 81, and the green power charging station 60 may be equipped with an adapter for connecting the transport machine 80 to the charger 81. In the third aspect, as in the second aspect, the power supply service can be provided at any location where the transport machine 80 can move, thereby enabling more flexible service provision. In addition, in this case, the rechargeable battery is provided pre-charged, which is convenient for the user as it does not need to wait for charging to complete. In addition, in the third aspect, used rechargeable batteries may be collected at the destination of the transport machine 80, and the collected rechargeable batteries may be recharged at the green power charging station 60 and used in the next service provision.

[0040] Furthermore, the configurations of the green electricity charging station 60 and the transport machine 80 may be modified as appropriate so that the charging services of the first to third aspects can be provided in combination.

[0041] According to the power supply system 1 of the embodiment configured as above, the convenience of green power can be improved.

[0042] More specifically, under the current green power certification system, the environmental value held by a user who has obtained a green power certificate is managed regardless of the origin of the electricity that the user actually uses, which makes it less convincing for users who want to use green power for their actual electricity use, and it is not necessarily convenient. In contrast, the power supply system 1 of the embodiment ensures that the electricity provided via the green power charging station 60 does not include electricity generated by sources other than the power supply system 1, so there is a strong correlation between the environmental value granted by the green power certification and the origin of the electricity that is actually used, and users who want to use green power can use the power supply service with a high degree of convincing.

[0043] Furthermore, according to the power supply system 1 of the embodiment, only green power generated by the on-site system 1A is provided to meet off-site power demand, so the relationship between the green power supplier and the consumer is simplified and the nature of the exchanged power is clear. Therefore, if the green power generated by the power supply system 1 is subject to certification under the green power certification system, the procedure will be simple and easy, and it is expected that the time required for the procedure will be shortened.

[0044] Furthermore, according to the power supply system 1 of the embodiment, the power utilization process 40 and the heat utilization process 50 are provided on the on-site system 1A side as power demands parallel to the green power charging station 60 on the off-site system 1B side, so that the influence of fluctuations in power demand due to the green power charging station 60 can be leveled across the entire system. This makes it possible to operate the power generation equipment on the on-site system 1A side at an optimal load.

[0045] Furthermore, according to the embodiment of the power supply system 1, by sending steam of different temperatures and pressures, such as the extracted exhaust steam from the extraction turbine 121 and the final exhaust steam (waste heat), to the heat utilization process 50, it is possible to select steam of a temperature and pressure suitable for each heat utilization facility that makes up the heat utilization process 50, thereby improving the overall energy efficiency of the power supply system 1. [Explanation of symbols]

[0046] 1. Power supply system 1A In-house system 1B External System 10. First Power Plant 11 Biomass boiler 12 First power generating unit 121 Extraction turbine 122 No. 1 Generator 13 Second power generating unit 131 Microturbine 132 Second Generator 14 Steam Diversion Device 20. Second Power Plant 21 Renewable energy boiler 22 Third Power Generating Unit 221 Turbine 222 Third Generator 223 Condensate Power Generation Mechanism 2231 Steam distribution device 2232 Condensing turbine 2233 Condenser 2234 4th Generator 31 Power distribution network 32 First Distribution Station 33 Second distributor 34 Transformer 35 1st AD converter 36 Second AD converter 40 Electricity Utilization Process 50 Heat utilization process 60 Green Power Charging Stations 70 External power supply 80 Transportation machinery 81 Charger

Claims

1. A power generation facility that generates green electricity using renewable energy, a charging device that charges a device that operates using a rechargeable storage battery; an electrothermal process that utilizes electricity or heat; Equipped with The charging device is supplied with only the green electricity generated by the power generation facility, the charging device charges the device with the green power; The heat generated in the power generation facility in association with the generation of the green power and the surplus green power generated in the power generation facility other than the power supplied to the charging device are supplied to the electric heat utilization process. Power supply system.

2. The power generation facility includes one or more power generation devices that use biomass, solar, wind, geothermal, or small hydropower as energy sources; The power supply system according to claim 1 .

3. the device is a transport machine that moves to an installation location of the charging device and charges the storage battery, The power supply system according to claim 1 .

4. the power generation facility includes a boiler that burns biomass, and a first steam turbine power generation device that is driven by high-temperature, high-pressure steam supplied from the boiler; the charging device is installed outside the installation site of the power generation facility and the electric heat utilization process; a first power distributor that distributes green electricity generated by the first steam turbine power generator; one of the distribution lines branched by the first distributor is connected to the charging device; the other end of the distribution line branched off by the first distributor is connected to a distribution network within the installation site; The power supply system according to claim 1 .

5. the first power distributor has a power backflow prevention function for preventing power from being supplied to the charging device via the power distribution network; The power supply system according to claim 4 .

6. a second steam turbine power generating unit that generates electricity using steam extracted from the first steam turbine power generating unit; the first steam turbine power generation unit includes an extraction turbine that extracts steam for the second steam turbine power generation unit; supplying green electricity generated by the second steam turbine power generation device to the charging device; The power supply system according to claim 4 .

7. a steam dividing device that adjusts the amount of steam extracted by the extraction turbine to be sent to the second steam turbine power generation device in accordance with the amount of power demanded by the charging device; Among the steam extracted by the extraction turbine, surplus steam other than the steam sent to the second steam turbine power generation device is supplied to the electric heat utilization process. The power supply system according to claim 6 .

8. a second power distributor that distributes green electricity generated by the second steam turbine power generator; transmitting surplus green power generated by the second steam turbine power generation device other than the green power sent to the charging device to an internal power distribution network within the installation site; The power supply system according to claim 6 .

9. the second power distributor has a power backflow prevention function for preventing power from being supplied to the charging device via the power distribution network; The power supply system according to claim 8.

10. Two or more power generating devices are connected to the power distribution network. The power supply system according to claim 4 .

11. An external power source is connected to the power distribution network. The power supply system according to claim 4 .

12. The biomass used by the power generation facility to generate green electricity is black liquor discharged from a pulp cooking process. The power supply system according to claim 4 .

13. The biomass used by the power generation facility to generate green electricity is woody biomass. The power supply system according to claim 4 .

14. The biomass used by the power generation facility to generate green electricity is biomass alone, waste, or a mixture of biomass and waste. The power supply system according to claim 4 .

15. The charging device charges the device by high-voltage DC rapid charging. The power supply system according to claim 1 .

16. A power generation facility that generates green electricity using renewable energy, a charging device that charges a device that operates using a rechargeable storage battery; an electrothermal process that utilizes electricity or heat; A power supply method using a power supply system comprising: The charging device is supplied with only the green electricity generated by the power generation facility, the charging device charges the device with the green power; The heat generated in the power generation facility in association with the generation of the green power and surplus power of the green power generated in the power generation facility other than the power supplied to the charging device are supplied to the electric heat utilization process. Power supply method.

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