| Planned | Project developerHiyama Area Offshore (J-POWER) | Development | J-POWER Hiyama Area offshore wind proposal |
| Decommissioned | Joint research contractor and local project implementerKitakyushu | Development And Operation | Kitakyushu offshore wind turbine and observation tower |
| Decommissioned | Demonstration operatorKitakyushu | Operations And Maintenance | Kitakyushu fixed-bottom offshore wind demonstrator |
| Decommissioned | Joint research contractor and local project implementerKitakyushu Offshore Demonstration Project | Development And Operation | Kitakyushu offshore wind turbine and observation tower |
| Decommissioned | Joint research contractor and local project implementerKitakyushu Offshore Demonstration Project | Development And Operation | Kitakyushu offshore wind turbine and observation tower |
| In Construction | Project-company participantOga-Katagami-Akita | Development | Oga-Katagami-Akita offshore wind project |
| In Construction | Floating wind demonstration participantThe Wheel | Technology Demonstration And Site Application | WHEEL manufacturing, assembly, installation and operation |
| Planned | Owner Developer · 100%Awara - J-Power | Ownership | Ownership relationship |
| In Operation | Owner · 40%Kita Kyushu Port Hibikinada | Ownership | Ownership relationship |
| In Operation | Non Operating Owner · 25%Triton Knoll Wind Farm | Ownership | Electric Power Development Co., Ltd. (J-POWER) holds a 25% ownership share in Triton Knoll Offshore Wind Farm. |
| In Operation | OperatorAkiha 1 hydroelectric plant | Hydroelectric | Akiha 1 hydroelectric plant |
| In Operation | OperatorAkiha 2 hydroelectric plant | Hydroelectric | Akiha 2 hydroelectric plant |
| In Operation | OperatorAkiha 3 hydroelectric plant | Hydroelectric | Akiha 3 hydroelectric plant |
| In Operation | OperatorAwara-Kitagata wind farm | Onshore wind | Awara-Kitagata wind farm |
| In Operation | OperatorFutamata Kochi hydroelectric plant | Hydroelectric | Futamata Kochi hydroelectric plant |
| In Operation | OperatorHiyama-Kogen wind farm | Onshore wind | Hiyama-Kogen wind farm |
| In Operation | OperatorIkehara hydroelectric plant | Pumped hydro | Ikehara hydroelectric plant |
| In Operation | OperatorKuromatagawa Daiichi hydroelectric plant | Hydroelectric | Kuromatagawa Daiichi hydroelectric plant |
| In Operation | OperatorMiboro hydroelectric plant | Hydroelectric | Miboro hydroelectric plant |
| In Operation | OperatorMinami Ehime wind farm | Onshore wind | Minami Ehime wind farm |
| In Operation | OperatorMisakubo hydroelectric plant | Hydroelectric | Misakubo hydroelectric plant |
| In Operation | OperatorNagano hydroelectric plant | Pumped hydro | Nagano hydroelectric plant |
| In Operation | OperatorNanairo hydroelectric plant | Hydroelectric | Nanairo hydroelectric plant |
| In Operation | OperatorNumappara hydroelectric plant | Pumped hydro | Numappara hydroelectric plant |
| In Operation | OperatorOkukiyotsu Daini hydroelectric plant | Pumped hydro | Okukiyotsu Daini hydroelectric plant |
| In Operation | OperatorOkukiyotsu hydroelectric plant | Pumped hydro | Okukiyotsu hydroelectric plant |
| In Operation | OperatorOkutadami hydroelectric plant | Hydroelectric | Okutadami hydroelectric plant |
| In Operation | OperatorOshirakawa hydroelectric plant | Hydroelectric | Oshirakawa hydroelectric plant |
| In Operation | OperatorOtori hydroelectric plant | Hydroelectric | Otori hydroelectric plant |
| In Operation | OperatorSakuma hydroelectric plant | Hydroelectric | Sakuma hydroelectric plant |
| In Operation | OperatorSendaigawa Daiichi hydroelectric plant | Hydroelectric | Sendaigawa Daiichi hydroelectric plant |
| In Operation | OperatorSetana Osato wind farm | Onshore wind | Setana Osato wind farm |
| In Operation | OperatorShimogo hydroelectric plant | Pumped hydro | Shimogo hydroelectric plant |
| In Operation | OperatorShintoyone hydroelectric plant | Pumped hydro | Shintoyone hydroelectric plant |
| In Operation | OperatorTadami hydroelectric plant | Hydroelectric | Tadami hydroelectric plant |
| In Operation | OperatorTagokura hydroelectric plant | Hydroelectric | Tagokura hydroelectric plant |
| In Operation | OperatorTaki hydroelectric plant | Hydroelectric | Taki hydroelectric plant |
| In Operation | OperatorTedorigawa Daiichi hydroelectric plant | Hydroelectric | Tedorigawa Daiichi hydroelectric plant |
| In Operation | Investor | Onshore grid assets | The Wheel · Final Grid Connection Point |
| In Operation | OperatorTotsugawa Daini hydroelectric plant | Hydroelectric | Totsugawa Daini hydroelectric plant |
| In Operation | OperatorTotsukawa Daiichi hydroelectric plant | Hydroelectric | Totsukawa Daiichi hydroelectric plant |
| In Operation | Owner | Onshore grid assets | Triton Knoll Wind Farm · Final Grid Connection Point |
| In Operation | Owner | Onshore grid assets | Triton Knoll Wind Farm · Intermediate Connection Asset |
| In Operation | OperatorYugami hydroelectric plant | Hydroelectric | Yugami hydroelectric plant |