Method and system for recovering storage media for offshore power generation energy

Abstract

In a method for transferring a storage medium of power generation energy loaded on a power generation floating body to a gathering base, the power generation floating body has a catamaran structure in which two ship bodies arranged in parallel are connected to both sides of a deck part, and the power generation floating body is moved to the gathering base. The deck portion crosses a long bank portion formed by protruding on the water surface along a wharf of the gathering base and clamping a water channel through which the ship body can pass, and in the state that one side of the ship body enters the water channel, the power generation floating body is parked, at least one side of the ship body of the deck portion is separated from the deck portion, and the deck portion advances on the long bank portion. Another hull on which a storage medium capable of storing energy is loaded is connected to the side of the deck section separated from the hull, and the power generation floating body is departed from the port in a state where the hulls are connected to both sides of the deck section.

Description

Technical Field

[0001] This invention relates to a method and system for recovering energy from offshore power generation. More specifically, this invention relates to a method and system for transferring a medium for storing electrical energy obtained by a floating body (power generation floating body) equipped with a wind turbine from the power generation floating body to a storage base for the storage medium. Background Technology

[0002] Offshore wind power is gaining attention as a method for obtaining renewable energy. At sea, there are fewer restrictions from land or roads, and a stable wind of the same intensity blowing in the same direction can be expected, allowing for the advantageous utilization of wind power's ability to generate electricity stably even at night. Therefore, various technologies related to offshore wind power have been proposed. For example, Japanese Patent Application Publication 2024-80145 discloses an offshore energy harvesting system comprising multiple floating power generation devices and a platform separate from these devices. The system includes a microwave transmission section and a microwave receiving section. The microwave transmission section transmits the electricity generated by the floating power generation devices in a floating state at sea as microwaves. The microwave receiving section receives microwaves transmitted from the microwave transmission section of the floating power generation devices by the platform. Both the microwave transmission section and the microwave receiving section have array antennas with multiple element antennas arranged in a specific pattern. The microwave transmission section transmits the transmitted electricity to the microwave receiving section in reverse operation. The microwave receiving section receives coherent microwaves with consistent frequency and phase from the multiple floating power generation devices. Summary of the Invention

[0003] As methods of offshore wind power generation systems, two types have been proposed and developed: the seabed-mounted type (systems where the generator is fixed to the seabed) which is set up in shallow waters close to land, and the floating type (systems where the generator is mounted on a floating body such as a ship) which can be deployed even in deep waters. Among these methods, the floating system has an advantage in terms of efficiently recovering wind energy because it allows the floating power-generating body to be appropriately moved to areas with strong winds. However, the situation differs between the floating and seabed types regarding the transmission of energy generated from offshore wind power to the consumption site. Laying power transmission cables from the system to land is extremely difficult. Transmitting electricity using microwaves, as described in Japanese Patent Application Publication No. 2024-80145, may also be difficult (sometimes due to excessively long transmission distances). Therefore, in the case of the floating system, the electrical energy generated by the floating power-generating body is charged into a battery. Alternatively, the electrical energy is converted into chemical energy held in hydrogen gas generated through a water splitting reaction caused by this energy. This hydrogen gas is stored in tanks, and the energy is stored in storage media (batteries, hydrogen storage tanks) mounted on the floating power-generating body. When appropriate, the power generation floating body is moved from its power generation site to a storage medium aggregation base on land or at sea. The storage medium is then transferred from the power generation floating body to the aggregation base. In this case, the transfer of the storage medium from the power generation floating body to the aggregation base is performed as quickly as possible, preferably with the power generation floating body able to move quickly to the power generation site.

[0004] Thus, the main objective of this invention is to enable the transfer of the storage medium from the floating power generation body to the accumulation base as quickly as possible in a floating offshore wind power generation system.

[0005] As one method of wind power generation mounted on a floating power generation body at sea, a kite-type (kite-type power generation system) is known, which generates electricity by launching and lowering a kite from the floating power generation body. When implementing this kite-type power generation via a floating body at sea, it is preferable to maintain the floating body as stably as possible, even when the kite experiences a wind-induced tilting moment. As the structure of the floating power generation body, a catamaran, i.e., a hull with two parallel hulls connected by a deck section carrying the kite-type power generation system, can be advantageously used. When using this catamaran as a floating power generation body, if the two hulls can be detached from the deck section, the hull carrying the stored energy medium is separated from the deck section when moving the floating power generation body to the storage medium storage base to transfer the stored medium. Instead, the hull carrying the energy-storing or empty storage medium is connected. In this way, the floating power generation body can be moved to the power generation site immediately. Therefore, the time available for power generation can be extended. This insight can be utilized in the present invention.

[0006] According to one embodiment of the present invention, the above-mentioned problem is achieved by a method comprising transferring a storage medium, which stores energy generated by a floating power generation body and is mounted on the floating power generation body, to a collection base in a floating offshore wind power generation system, wherein the floating power generation body has a catamaran structure consisting of two parallel hulls connected to both sides of a deck section, and the storage medium is mounted on the hulls. The method for transferring the storage media to the aggregation site includes: The first process involves moving the power-generating floating body to the aggregation base; In the second process, the deck section of the power generation floating body spans across the dock along the gathering base and the waterway through which the hull of the power generation floating body can pass is formed by a long breakwater on the water surface. With the side of the hull of the power generation floating body entering the waterway, the power generation floating body is moored. The third process involves separating the hull of at least one side of the deck portion of the power-generating floating body from the deck portion; The fourth process involves advancing the deck section over the breakwater section; The fifth process involves connecting another hull, equipped with an energy storage medium, to the side of the deck section separated from the hull; and The sixth process involves the ship leaving the power-generating floating body while the ship's hull is connected to both sides of the deck section.

[0007] In the above structure, the "storage medium" can be a battery charged with electrical energy, or a tank storing hydrogen generated by the water splitting reaction of electricity obtained through power generation, or liquid hydrogen obtained by liquefying the hydrogen. The "power-generating float" can be configured to carry any form of wind power generation system, such as a kite-type power generation system, and store the energy obtained through power generation in the storage medium mounted on the hull. In the case of the present invention, as described above, the power-generating float has a catamaran structure, consisting of two parallel hulls detachably connected on both sides of the deck, with the storage medium mounted on the hull. The "aggregation base" can be a facility set up at sea or on land for aggregating the stored medium to a place of energy consumption, as described above, with a long breakwater section protruding from the water surface along its dock and through which the hull of the power-generating float can pass.

[0008] In the method of the present invention described above, a storage medium is transferred to a gathering base. This storage medium stores energy generated by a power-generating floating body with a catamaran structure. As the power-generating floating body moves toward the gathering base, its deck section spans a breakwater section protruding from the water surface of the gathering base, and it moors with one side of its hull entering the waterway between the breakwater section and the dock of the gathering base. Furthermore, the hull carrying the storage medium is separated from the deck section. In this state, the deck section moves forward. Another hull carrying the energy-storing storage medium is connected to the side of the hull from which the deck section has been separated. The power-generating floating body departs from the gathering base. That is, in the method of the present invention, at the gathering base, the hull carrying the energy-storing storage medium in the power-generating floating body is exchanged with another hull carrying the energy-storing storage medium. According to this structure, when the storage medium is transferred from the power-generating float to the collection base, the storage medium loaded on the hull is transferred to the collection base. Furthermore, during the transfer of energy-storing or empty storage medium from the collection base to the hull, the power-generating float does not need to remain moored at the collection base. Once the hull replacement is completed, the power-generating float can quickly depart from the collection base towards the power generation site. Therefore, it has advantages in terms of longer power generation time within the power-generating float and the ability to acquire more energy. Additionally, to facilitate the advancement of the deck section on the breakwater section, guide rails can be laid on the breakwater section to abut against the lower surface of the deck section, allowing the deck section to slide or move.

[0009] In the method of the present invention described above, a seventh process can be performed, in which the storage medium loaded in the hull, which is separated from the deck portion in the third process, is transferred to the aggregation base. During the transfer of the storage medium from the hull to the aggregation base in this process, the power generation float is not utilized. It is possible to move to the power generation site and generate electricity.

[0010] In the method of the present invention described above, it can be configured such that, in the third process, only one side of the hull of the power-generating float separates from the deck section, and in the fourth process, the deck section moves forward on the breakwater section by advancing the other hull, which is connected to the deck section. Therefore, no other mechanism needs to be prepared in advance to allow the deck section to move forward on the breakwater section. Furthermore, in this case, when the power-generating float berths at the gathering base once, only one side of the hull of the deck section can be replaced, or both sides of the deck section can be replaced sequentially.

[0011] Furthermore, in the method of the present invention described above, it can be configured such that in the third process, the hulls on both sides of the power-generating float separate from the deck section, and in the fourth process, only the deck section advances on the breakwater section. In this case, it is also possible to replace the hulls on both sides of the deck section simultaneously, thus it is expected to shorten the time required to replace the two hulls.

[0012] In the method of the present invention described above, the power-generating floating body has a catamaran structure consisting of two parallel hulls capable of carrying storage media, detachably connected on both sides of the deck section. This can be achieved in a structure with a breakwater section at the agglomeration base, the breakwater section being formed by protruding above the water surface along the pier and sandwiching a waterway through which the hull of the power-generating floating body can pass, and the deck section of the power-generating floating body can move forward across it. Thus, according to another aspect of the present invention, the above-mentioned problem is achieved by a system that transfers a storage medium, containing energy generated by the power-generating floating body and loaded on the power-generating floating body, from a floating offshore wind power generation system to the agglomeration base. The power-generating floating body has a catamaran structure consisting of two parallel hulls that are detachably connected on both sides of the deck section. The storage medium is mounted on the hull of the ship. The aggregation base has a long breakwater section that protrudes from the water surface along the pier and encloses a waterway through which the hull of the power-generating floating body can pass, and the deck section of the power-generating floating body can move forward across it. The system is equipped with: A mechanism for separating at least one side of the deck of the power-generating float from the deck when the deck section is spanning the breakwater section and one side of the hull of the power-generating float is in the waterway, so that the power-generating float is moored. A mechanism for advancing the deck section, which has been separated from at least one side of the hull, along the breakwater section; and A mechanism for connecting the deck section to the side separated from the hull, where another hull is equipped with a storage medium capable of storing energy. The system is configured such that the power-generating floating body, which is connected to the other hull on the deck, can depart from the aggregation base.

[0013] In the above system, the storage media loaded in the hull separated from the deck can be transferred to the collection base. In the breakwater section, the hull can be replaced one by one, or the hulls on both sides can be replaced simultaneously.

[0014] Thus, in the aforementioned structure, the transfer of the storage medium from the floating body to the receiving base in a floating offshore wind power generation system can be performed as quickly as possible. The residence time of the power-generating floating body at the receiving base is shortened. This is advantageous in terms of increasing power generation time and output. Moreover, as a result, in offshore power generation, the energy storage medium recovered is transported efficiently, thereby increasing the supply to land can be expected.

[0015] Other objects and advantages of the present invention will become apparent from the following description of preferred embodiments of the invention. Attached Figure Description

[0016] Hereinafter, with reference to the accompanying drawings, the features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described, in which the same reference numerals denote the same elements, and wherein: Figure 1A This is a schematic front view of the floating body used in the recovery of the energy storage medium for offshore wind power generation in this embodiment.

[0017] Figure 1B This is a schematic top view of the floating body used in the recovery of the energy storage medium for offshore wind power generation in this embodiment.

[0018] Figure 1C This is a schematic top view of the storage medium accumulation base in the method for recovering marine power generation energy in this embodiment.

[0019] Figure 1D This is a schematic cross-sectional view of the storage medium accumulation base in the method for recovering marine power generation energy in this embodiment.

[0020] Figure 2A This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in one embodiment of the method.

[0021] Figure 2B This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in one embodiment of the method.

[0022] Figure 2C This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in one embodiment of the method.

[0023] Figure 3 This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in another embodiment of the method.

[0024] Figure 4 This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in another embodiment of the method.

[0025] Figure 5A This is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in another aspect of the method of this embodiment.

[0026] Figure 5BThis is a top view of the assembly base schematically illustrating the process of replacing the hull of the power-generating floating body of the catamaran structure in another aspect of the method of this embodiment. Detailed Implementation

[0027] Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same symbols denote the same parts.

[0028] Structure of the power generation floating body In offshore wind power systems to which this embodiment applies, such as Figure 1A , Figure 1B The diagram schematically illustrates a power-generating floating body 10 using a catamaran structure. In the power-generating floating body 10, hulls 12 and 13 are connected to both sides of a deck section 14 in a parallel arrangement, forming a bridge or deckhouse 16 on the deck section 14 where a power generation system 15 is installed. The power generation system 15 can be any type of system; typically, it can be a kite-type power generation system that recovers wind energy generated when a kite 15a is lifted into the air by converting it into electrical energy. Furthermore, the obtained electrical energy can be stored in any manner in a storage medium HT loaded in the hulls 12 and 13. More specifically, in one embodiment, the obtained electrical energy is converted into hydrogen energy (the chemical energy possessed by hydrogen molecules) by a water splitting reaction to produce hydrogen gas. The hydrogen gas, retaining its energy, is compressed or liquefied and stored in a tank as the storage medium HT, thereby storing the energy. In another embodiment, the obtained electrical energy is used as the storage medium HT to charge a battery, thereby storing the energy. In addition, the storage of energy from the power generation system to the storage medium HT can typically be accomplished by automatically operating mechanical devices without human intervention.

[0029] The structure of the storage media aggregation base In this embodiment, the storage medium HT loaded in the hulls 12 and 13 of the vessel, which stores the energy generated by the floating power generation body 10 in the offshore wind power generation system, is transported in a timely manner to the aggregation base 20 located at sea or on land. For example... Figure 1C , Figure 1DAs schematically shown, the aggregation base 20 is basically composed of a base body 22 protruding from the water surface WL where the storage medium HT is aggregated, and a long breakwater 23 protruding from the water surface WL. The long breakwater 23 can be positioned between the base body 22 and the dock 22a using a waterway retaining device 25a to define a waterway 25 that allows the hulls 12 and 13 of the power generation float 10 to enter. Furthermore, as described later, the long breakwater 23 may be provided with: a hull securing device 24a; a device (not shown) for detaching the deck section 14 from the hull 12 or 13; a hull securing device 24b; and a device (not shown) for connecting the deck section 14 to the hull 12a or 13b. When the hull 12 or 13 of the power generation float 10 enters the waterway 25, the hull securing device 24a retains the hull 12 or 13 to detach from the deck section 14. The hull securing device 24b is used to hold the other hull 12a or 13a in place to connect it to the deck section 14 of the separated hull 12 or 13. Furthermore, the upper surface of the breakwater section 23 may be provided with guide rails 24 for sliding or moving the deck section 14. On the other hand, in the base body 22, a storage media transfer machine 26, such as a crane, may be provided for transferring the storage media HT loaded on the hulls 12 and 13 to the storage tank of the base body 22 when the hulls 12 and 13 are moored in the waterway 25. The base body 22 and the breakwater section 23 can be either anchored or floating.

[0030] Replacement of the ship's hull for generating electricity In the offshore wind power generation system subject to this embodiment, the power generation float 10 moves to a location where power generation is more efficient to perform power generation. Energy is stored in the storage medium HT. Subsequently, the power generation float 10 moves to the accumulation base 20 as needed, unloading the energy-storing storage medium HT into the accumulation base 20. The power generation float 10 is loaded with either an energy-storing or empty storage medium HT and moves again to a location where power generation is possible. The power generation float 10 performs power generation and energy storage in the storage medium HT. It can be assumed that this cycle is repeated. In this case, in order to recover more energy, as described in the summary of the invention, it is preferable to shorten the time the power generation float 10 stays in the accumulation base 20 by moving the storage medium HT loaded therein to the accumulation base 20, thereby maximizing the time the power generation float 10 can generate electricity. Therefore, in this embodiment, the advantage of the power generation float 10 being a catamaran structure is taken advantage of, and the time the power generation float 10 stays in the accumulation base 20 is shortened. If the power-generating float 10 reaches the gathering base 20, the hulls 12 and 13 of the power-generating float 10, which are loaded with the energy-accumulating storage medium HT, are separated from the deck section 14 and remain in that position. Meanwhile, another hull 12a or 13a, loaded with either energy-accumulating or empty storage medium HT, is connected. This makes the power-generating float 10 capable of being moved again to a position where it can generate electricity. That is, in this embodiment, within the gathering base 20, the replacement is performed between the hulls 12 and 13 of the power-generating float 10, which are loaded with the energy-accumulating storage medium HT, and another hull 12a or 13a, which are loaded with either energy-accumulating or empty storage medium HT. According to this structure, after the power-generating float 10 reaches the gathering base 20, it can depart without the time required to transfer the energy-accumulating storage medium HT from the hulls 12 and 13 to the gathering base 20, or the time required to transfer the energy-accumulating or empty storage medium HT from the gathering base 20 to the hulls 12 and 13. As a result, the power generation time can be extended.

[0031] (1) The situation of replacing the hull one by one More specifically, firstly, in the case of replacing the structure of one of the hulls of the power generation float 10, such as... Figure 2A As shown, (i) the power generation float 10 is moved to the gathering base 20. (ii) a hull 12 is brought into the waterway between the base body 22 and the breakwater section 23, and the power generation float 10 is moored with the deck section 14 spanning the breakwater section 23. Here, as... Figure 2BAs shown, (iii) the hull 12 is separated from the deck section 14, and (iv) the hull 13 and the deck section 14 are moved forward. Meanwhile, another hull 12a, 13a, loaded with energy-accumulating or empty storage medium HT, moves to the arrival position of the deck section 14 in the breakwater section 23. Then, (v) the deck section 14 is connected to the hull 12a. Thus, (vi) the power-generating float 10 departs from the gathering base 20. On the other hand, in the hull 12 separated from the deck section 14, the storage medium loaded therein is transferred to the base body 22 by the storage medium transfer machinery 26. Thereafter, the energy-accumulating or empty storage medium HT is loaded onto the hull 12 and can stand by for the next power-generating float to arrive at the gathering base.

[0032] Furthermore, in the case of replacing the hull on both sides of the power-generating floating body 10 one by one, in one method, such as Figure 3 As shown, an assembly base 20 can be configured with long breakwater sections 23 on both sides of the base body 22. In this case, when the power-generating float 10 arrives at the assembly base 20, (a) the deck section 14 is anchored while spanning one long breakwater section 23. (b) one hull 12 is separated, and the deck section 14 and the other hull 13 move forward. (c) the other hull 12a is connected to one side of the separated hull of the deck section 14. Thereafter, (d) the power-generating float 10 is anchored while the deck section 14 spans the other long breakwater section 23. (e) the other hull 13 is separated, and the deck section 14 and the other hull 12a move forward. (f) the other hull 13a is connected to one side of the separated hull of the deck section 14. Thus, the power-generating float 10, with its two hulls replaced, departs from the assembly base 20.

[0033] In addition, in another scenario where the hull on both sides of the power-generating floating body 10 is replaced one by one, such as... Figure 4 As shown, two sets of base bodies 22 and breakwater sections 23 can be provided. In this case, when the power-generating float 10 reaches another gathering base 20, (a) the deck section 14 is moored while spanning a breakwater section 23. (b) one hull 12 is separated, and the deck section 14 and the other hull 13 move forward. (c) The other hull 12a is connected to one side of the separated hull of the deck section 14. Subsequently, the power-generating float 10 moves to another gathering base 20, (d) the power-generating float 10 is moored while the deck section 14 spans the breakwater section 23 of the other gathering base 20. (e) the other hull 13 is separated, and the deck section 14 and the other hull 12a move forward. (f) The other hull 13a is connected to one side of the separated hull of the deck section 14. In this way, the power-generating float 10, with its two hulls replaced, departs from the other gathering base 20.

[0034] exist Figure 3 ,4 In any of the cases, the storage medium loaded therein is transferred to the base body 22 by means of storage medium transfer machinery 26 in the hulls 12 and 13, which are separated from the deck section 14. Thereafter, the energy-accumulating or empty storage medium HT is loaded on the hulls 12 and 13 and can stand by for the next arrival of the power generation floating body at the gathering base.

[0035] (2) Simultaneous replacement of both sides of the hull In the case of simultaneously replacing the structures of the hulls 12 and 13 on both sides of the power generation floating body 10, in one manner, such as Figure 5A As shown, the gathering base 20 can be a structure in which the base body 22 is provided on both sides of the breakwater section 23. In this case, when the power generation floating body 10 arrives at the gathering base 20, (a) the deck section 14 is moored while spanning the breakwater section 23. (b) the hulls 12 and 13 on both sides are separated, and the deck section 14 moves forward alone. (c) the hulls 12a and 13a are connected to the two sides of the separated hulls of the deck section 14, and the vessel departs from the gathering base 20.

[0036] Furthermore, in another scenario where the structures of the hulls 12 and 13 on both sides of the power-generating floating body 10 are simultaneously replaced, such as... Figure 5B As shown, a structure 23a integrating the base body 22 and the breakwater section 23 can be used. In this case, if the power generation floating body 10 reaches the gathering base 20, then (a) the deck section 14 is moored while spanning the breakwater section 23a. (b) the hulls 12 and 13 on both sides are separated, and the deck section 14 moves forward alone. (c) the hulls 12a and 13a are connected to the sides of the separated hulls of the deck section 14, and it departs from the gathering base 20.

[0037] Thus, according to the structure of this embodiment described above, if the power-generating float 10 changes its hull in the aggregation base 20, it can depart immediately, thereby obtaining more power generation time and power output. This embodiment has advantages in obtaining more power generation time and power output, even when using a power-generating float equipped with a power generation system other than a kite-type power generation system, which is also within the scope of this embodiment.

[0038] The above description relates to embodiments of the present invention, but those skilled in the art can easily make numerous modifications and alterations. The present invention is not limited to the embodiments illustrated above and is applicable to various devices without departing from the concept of the present invention.

Claims

1. A method of transferring a storage medium storing energy generated by a power generating float and loaded on the power generating float to a collecting base in a floating offshore wind power system, wherein, The power generating floating body has a catamaran structure in which two parallel arranged hulls are connected on both sides of a deck portion, and the storage medium is loaded on the hulls, characterized in that The method of transferring the storage medium to the gathering base includes: a first process of moving the power generating floating body to the gathering base; a second process of making the power generating floating body stop in a state in which the deck portion of the power generating floating body is straddled on a wharf along the gathering base and a levee portion protruding on the water surface formed by a waterway through which the hulls of the power generating floating body can pass is protruded on both sides of the deck portion, and the hull of one side of the power generating floating body enters the waterway; a third process of separating the hull of at least one side of the deck portion of the power generating floating body from the deck portion; a fourth process of making the deck portion advance on the levee portion; a fifth process of connecting another hull loaded with the storage medium capable of storing energy on the side of the deck portion from which the hull is separated; and a sixth process of departing from the power generating floating body in a state in which the hulls are connected on both sides of the deck portion.

2. The method of claim 1, wherein, includes: a seventh process of transferring the storage medium loaded in the hull separated from the deck portion in the third process to the gathering base.

3. The method according to claim 1, characterized in that in the third process, only the hull of one side of the power generating floating body is separated from the deck portion, in the fourth process, the deck portion is made to advance on the levee portion by the other hull connected in the state of the deck portion.

4. The method according to claim 1, characterized in that in the third process, the hulls of both sides of the power generating floating body are separated from the deck portion, in the fourth process, only the deck portion advances on the levee portion.

5. A system of transferring the storage medium stored with energy generated by a power generating floating body and loaded on the power generating floating body in a floating offshore wind power generation system to a gathering base, characterized in that the power generating floating body has a catamaran structure in which two parallel arranged hulls are separably connected on both sides of a deck portion, the storage medium is loaded on the hulls, the gathering base has a levee portion protruding on the water surface formed along a wharf and a waterway through which the hulls of the power generating floating body can pass, and the deck portion of the power generating floating body straddles and can advance on the levee portion, in the system, there are provided: a mechanism for separating the hull of at least one side of the deck portion of the power generating floating body from the deck portion when the deck portion is straddled on the levee portion in a state in which the hull of one side of the power generating floating body enters the waterway and the power generating floating body stops; a mechanism for making the deck portion from which the hull of at least one side is separated advance on the levee portion; and a mechanism for connecting another hull loaded with the storage medium capable of storing energy on the side of the deck portion from which the hull is separated, the system is configured so that the power generating floating body to which the other hull is connected on the deck portion can depart from the gathering base. ​

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