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| J-POWER | ||||||||
| J-POWERグループ税務方針 | ||||||||
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| (一社)日本人材紹介事業協会 | ||||||||
| jpower.co.jp | ||||||||
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| 人財パワー株式会社 | ||||||||
| 社会保険労務士法人なか | ||||||||
| 行政書士法人なか |
Establishment of Electric Power Development Co., Ltd.
To achieve stable electricity supply and efficient resource utilization, J-POWER began nuclear research and studies in 1954, shortly after its establishment.
Start of operation at Sakuma Power Plant.
Start of operation at Tagokura Power Plant.
Start of operation at Tsurumi Main Line and Minamikawagoe Substation.
Since the 1960s, it has cooperated on the development project of the ATR prototype reactor "Fugen", advancing nuclear safety and stable utilization.
Start of operation at Oku-Tsurumi Power Plant.
Start of operation at Gombu Power Plant.
Peru's Tacna Hydroelectric Power Project: First overseas consulting business on a commercial basis.
Start of operation at Wakamatsu Thermal Power Plant.
Start of operation at Ikehara Pumped Storage Power Plant.
Sakuma Frequency Converter Station begins operation: First time in Japan to supply power between east and west with different frequencies.
Thailand's Kwiya No.1 (Sienakarin) Hydroelectric Power Project.
Start of operation at Isogo Thermal Power Plant.
Start of operation at Takehara Thermal Power Plant.
Takasago Thermal Power Plant Commencement of Operation
Hannan Line (500kV) Commencement of Operation
Shin Toyone Power Plant (Pumped‑Storage) Commencement of Operation
Numahara Power Plant (Pumped‑Storage) Commencement of Operation
Onikubi Geothermal Power Plant Commencement of Operation
April 1976: The Oda Town Chamber of Commerce petitioned the town council for an environmental survey related to the establishment of a nuclear power plant.
The Omachi Nuclear Power Plant began construction in May 2008, following the initiation of the plan in 1976 and with the understanding and cooperation of local residents and stakeholders
Oku-Shimizu Power Plant (Pumped‑Storage) Commencement of Operation
Tategawa Daiichi Power Plant Commencement of Operation
Memorandum of Understanding signed for acquisition of interests in Australia's Blairmore Mine.
Kita-Homomachi Interconnection Equipment begins operation (Hakodate & Kamikita DC Converter Station): First high‑voltage DC transmission technology in Japan, enabling interconnection between Hokkaido and Honshu.
West Region Interconnection Line Full‑Line Commencement of Operation
Matsushima Thermal Power Station begins operation: First large‑scale coal power plant in Japan using overseas coal as the main fuel.
Sakuma II Power Plant Commencement of Operation
August 1982: The Nuclear Committee decided on the ATR demonstration reactor plan, with our company as the implementing body.
The Nuclear Energy Commission decided to implement the new ATR (Advanced Test Reactor) demonstration reactor plan with our company as the main operator
Takehara Thermal Power Plant (Unit 3) Commencement of Operation
December 1984: The Oda Town Council resolved to attract a nuclear power plant.
Omachi Town Council resolved to attract a nuclear power plant
June 1985: Our company consolidated the ATR plan and requested cooperation from local stakeholders, including the fishing cooperative.
Our company consolidated the ATR plan and requested cooperation from local stakeholders, including the fishing cooperative
Ishikawa Coal‑Based Thermal Power Plant Commencement of Operation
Shakugo Power Plant (Pumped‑Storage) Commencement of Operation
India's Pulriya Pumped Storage Power Project.
Matsura Thermal Power Plant Commencement of Operation
Basic Agreement on China Desulfurization Technology Demonstration Test Signed
Honshi Interconnection Line Commencement of Operation
August 1995: The Nuclear Committee decided to cancel the ATR demonstration plan and to construct a full MOX-ABWR as an alternative.
The Nuclear Energy Commission decided to cancel the ATR demonstration reactor plan and to construct a full MOX-ABWR as an alternative
Oku-Shimizu II Power Plant (Pumped‑Storage) Commencement of Operation
September 1998: Submitted the environmental impact assessment to the Ministry of International Trade and Industry.
Submitted the environmental impact assessment to the Ministry of International Trade and Industry
December 1998: Held the first public hearing (hosted by the Ministry of International Trade and Industry).
Held the first public hearing (hosted by the Ministry of International Trade and Industry)
August 1999: The 141st Electric Power Development Coordination Council approved inclusion of the basic plan.
Approved inclusion of the basic power development plan at the 141st Power Development Coordination Council
September 1999: Applied for reactor site approval (withdrawn in March 2004 due to a revised plant layout plan).
Application for reactor site approval (withdrawn in March 2004 due to revision of the power plant layout plan)
February 2000: Commenced preparatory works.
Expansion of Honshi Interconnection Line
Commencement of preparatory work
Thailand's Loyet & Sawdust Power Plant interests acquired.
Kii Waterway DC Interconnection Equipment Commencement of Operation
Tachibana Bay Thermal Power Plant Commencement of Operation
Tomamae Wind Farm begins operation: One of the largest domestic wind farms.
Pilot test operation of multi‑purpose coal gas manufacturing technology begins.
Repeal of the Electricity Supply Development Promotion Act
Sri Lanka's Upper Kotmale Hydroelectric Power Project.
March 2004: Application for reactor installation approval.
Application for Nuclear Reactor Installation Permit
Tokyo Stock Exchange First Section: Full privatization through listing.
Philippines' CBK Hydroelectric Project participation.
June 2005: Consulted with the Nuclear Safety Committee and the Nuclear Committee by the Minister of Economy, Trade and Industry.
Consultation from the Minister of Economy, Trade and Industry to the Nuclear Safety Commission and the Nuclear Commission
October 2005: Held the second public hearing (hosted by the Nuclear Safety Committee).
Second public hearing (hosted by the Nuclear Safety Commission)
USA's Tenaska Frontier Power Plant interests acquired.
Gunma Hachiyama Plateau Wind Farm Commencement of Operation
Thailand's Kaenkoei 2 Gas Thermal Power Plant begins operation.
April 2008: The Nuclear Safety Committee and the Nuclear Committee submitted a recommendation to the Minister of Economy, Trade and Industry. Reactor site approval.
Report from the Nuclear Safety Commission and the Nuclear Commission to the Minister of Economy, Trade and Industry
Nuclear Reactor Installation Permit
May 2008: Commencement of construction.
Oma Nuclear Power Plant Construction Begins
Construction Begins
Ishigo Thermal Power Plant Unit 2 Commencement of Operation
USA's Orange & Grove Power Plant begins operation.
March 2011: Construction work halted due to the Great East Japan Earthquake.
Miyazaki Wood Pellet Co., Ltd. wood pellet manufacturing plant completed.
Construction work halted due to the Great East Japan Earthquake
China Gahou Power Plant Commencement of Operation
October 2012: Resumption of main construction work.
Resumption of Main Construction Work
Thailand's Nonthaburi Gas Thermal Power Plant begins operation.
Tanazawa Unit 1 Commencement of Operation
December 2014: Application for reactor installation modification approval.
Application for Nuclear Reactor Installation Modification Permit
Thailand's Uthai Gas Thermal Power Plant begins operation.
Start of operation of Koyanagi Power Plant (small and medium hydroelectric)
Yurihonjo Coast Wind Farm Commencement of Operation
Start of operation of Yamakawazawa Geothermal Power Plant: a large-scale geothermal plant exceeding 10,000 kW output, the first in Japan in 23 years
Takehara Thermal Power Plant Unit 1 Commencement of Operation
Kashima Thermal Power Plant Unit 2 Commencement of Operation
September 2020: Approval of reactor facility safety regulations.
Approval of Nuclear Facility Safety Regulations
Formulation of J-POWER “BLUE MISSION 2050”: a business plan outlining efforts toward carbon neutrality and a hydrogen society
Participation in renewable energy projects in Australia: acquisition of a stake in Genex Power Limited and promotion of diverse renewable energy businesses such as solar, onshore wind, and pumped storage
Start of operation of Triton No. 1 Offshore Wind Farm in the UK: one of the world’s largest offshore wind farms
Start of operation of Jackson Thermal Power Plant in the United States
Start of operation of Batan Power Plant in Indonesia
Esashi Wind Farm Commencement of Operation
Start of operation of Lake Mineit Hydroelectric Power Plant in the Philippines
Start of operation of Anbi Geothermal Power Plant: a joint venture with Mitsubishi Materials and Mitsubishi Gas Chemical
Start of operation of Ishikari Yanozawa Wind Farm
Start of operation of Ueno Country Second Wind Farm
Himeji City Oshi Solar Power Plant Commencement of Operation
Kitakyushu Hibiki Nami Solar Power Plant Commencement of Operation
At the Oomahara Nuclear Construction Site, on November 10, 2026, around 8:15 a.m., a worker was walking near a backhoe and tripped, injuring the heel of his left foot. The diagnosis revealed a fracture of the left heel bone, requiring approximately three months of hospitalization and six months of treatment.
A 62-year-old male worker at the Oda Nuclear Construction Site was injured while walking near a backhoe when he tripped over vegetation, spraining his left heel. Diagnosis revealed a fracture of the left heel bone, requiring approximately three months of hospitalization and six months of treatment. Investigation into the cause is underway, and efforts are being made to ensure work safety and prevent occupational accidents.
Electric Power Development Co., Ltd. (J Power) announced that it will sponsor the International Horticultural Expo (GREEN×EXPO 2027) held in Yokohama City from March 19 to September 26, 2027. The expo, themed "Creating a Happy Tomorrow's Landscape," aims to promote environmental awareness and behavioral change through Nature-based Solutions. In line with the BLUE MISSION 2050, which seeks to achieve carbon neutrality and a hydrogen society, J Power continues its efforts toward a sustainable future.
The J-POWER website will undergo maintenance from 9:00 p.m. on November 10, 2026, until 5:00 a.m. on November 11. During the maintenance, access will be interrupted for approximately five minutes, and the website may temporarily be unavailable. After maintenance is complete, the website will be available as usual.
On September 29, 2026, at approximately 14:05, a personnel accident occurred during inspection of a large vehicle at the Ooma Nuclear Construction Site's operating training and public relations center premises. Investigation revealed that the cause was the left hand lowering the vehicle's wheel stop during disembarkation from the driver's seat. As a recurrence prevention measure, the policy was set to refrain from handling objects during vehicle lift and to enforce a three-point support with both hands and feet. The victim returned to work after 11 days of hospitalization.
At a meeting of the Board of Directors of Electric Power Development Co., Ltd. (J-POWER) held on October 30, 2026, a resolution was passed regarding the interim dividend for the 75th fiscal year. The dividend is ¥50 per share, and payments will begin on November 30, 2026. Dividend-related documents are scheduled to be mailed to the address on file on November 27.
Summary of Financial Results for the Second Quarter of the Fiscal Year Ending March 2027
J-POWER (Electric Power Development Co., Ltd.) will release two commercials from the new “Mr. Ikeda from TA” series, “Dam” and “Sightseeing Boat,” featuring Elaiza Ikeda and Soma Yamaji, online ahead of their TV debut. In the commercials, the pair visit Okutadami Dam on a university field trip and deepen their understanding of J-POWER’s business. The TV commercials will begin airing on November 1, accompanied by online-only videos.
Electric Power Development Co., Ltd. and Japan GX Group Co., Ltd. have released the 'C App', which turns environmentally conscious actions encouraged by businesses, municipalities, and stores into quests. Participants earn social credits through learning, purchasing, and attending events, and when they accumulate a certain amount, they can exchange them for J-Credits in partnership with the Japan Carbon Credit Exchange operated by JGX.
J Power and Sega X-D have begun full-scale use of the AR content "Power Plant Skeske AR," which allows learning about the internal structure and operation of power generation equipment. Starting in August 2026, it will be used at the Funami Power Plant and Akihaba No. 2 Power Plant tours to enhance visitor understanding and experiential value. Future plans include use at Onmoya Power Plant and Nagano Power Plant.