Zero Watt Power
Japanese renewable-energy company specializing in the stable supply and expansion of renewable power.
Last updated September 29, 2026
AI crawler reads
No AI crawler has read this profile since Oct 28, 2026.
Overview
Zero Watt Power (ゼロワットパワー株式会社) is a Japanese renewable-energy company founded in March 2015. Its name expresses the ambition of generating electricity with zero CO2 emissions, and its business is built around the stable supply and expansion of renewable energy. The company operates across three main pillars: retail electricity supply, power generation, and aggregation of renewable sources. It procures renewable electricity directly from more than 500 renewable power plants across Japan, with a total contracted capacity exceeding 2,000 MW, and owns its own generation assets totaling about 230 MW. This direct procurement model is intended to reduce exposure to wholesale market price volatility. Zero Watt Power supplies electricity to public institutions, decarbonization-minded companies, and individuals. It has a notable record of supplying 100% renewable electricity to government and municipal bodies, including Setagaya Ward (described as the first such case among local governments in Japan) and the Tokyo Metropolitan Government Building. It has been certified as a low-carbon electricity certified supplier under Tokyo's cap-and-trade program for several consecutive years, and in June 2024 obtained A-grade qualification under the national government's unified qualification system, allowing it to bid on all national agency contracts without a monetary ceiling. The company also promotes local production and local consumption of renewable energy, supporting municipalities and regions in developing generation projects. It has been involved in biomass power using waste cooking oil and has supported fuel procurement and design consulting for such plants. Its project partner municipalities include Kyoto Prefecture, Okayama Prefecture, Nagano Prefecture, and Osaka City. In 2022 it began supplying electricity in the Okinawa area, achieving nationwide supply excluding remote islands. It has expanded through acquisitions, including taking over the Ichihara and Mihama power plants from J-POWER in 2022 and acquiring Sawa Thermal Power Co., Ltd. (renamed Sawa Power Plant Co., Ltd.) in 2024 and Suzukawa Energy Center Co., Ltd. in 2025. In March 2025 the company marked its 10th anniversary.
History
Zero Watt Power was established in March 2015. In March 2016 it registered as a retail electricity business operator, and in September 2016 it received an EPC order for the Tsukuba Green Power Plant Tsuchiura No. 1 power station. In July 2017 it obtained ISO 14001 certification, and in August 2017 the Tsuchiura No. 1 power station began operation. In February 2018 it joined the RSPO (Roundtable on Sustainable Palm Oil). In April 2019 the company began supplying 100% renewable electricity to Setagaya Ward Office, described as the first such case among local governments in Japan, and established the JCSBG (Japan Consortium for Sustainable Biofuel Power Generation). In April 2020 it began supplying renewable electricity from the Kyoto Prefecture Ono Hydroelectric Power Plant to companies and individuals within Kyoto Prefecture as a local production for local consumption project, and through Marui Facilities Co., Ltd. supplied 100% renewable electricity to Marui Kashiwa store and Kashiwa Modi store. In October 2020 it began supplying 100% renewable electricity to the Tokyo Metropolitan Government Building. In March 2022 it registered as a power generation business operator. In May 2022 it began supplying electricity in the Okinawa area, achieving nationwide supply excluding remote islands. In June 2022 it received the transfer of the Ichihara and Mihama power plants from J-POWER. In October 2022 it won bids for electricity from 10 hydroelectric power plants of the Shimane Prefecture Enterprise Bureau. In February 2024 it was certified as a low-carbon electricity certified supplier by Tokyo for the fourth consecutive year. In June 2024 it dissolved JCSBG developmentally and established the LBA (Liquid Biomass Association, a general incorporated association). In August 2024 it registered as a specified wholesale supply business operator. In November 2024 it acquired shares of Sojitz Sawada Thermal Power Co., Ltd., changed the trade name to Sawada Power Plant Co., Ltd., and made it a subsidiary. In March 2025 it celebrated its 10th anniversary. In July 2025 it registered as a Chiba SDGs Partner. In September 2025 it acquired shares of Suzukawa Energy Center Co., Ltd. and made it a wholly owned subsidiary. It also registered with the Agency for Natural Resources and Energy's FIP system matching platform.
Founded
Registered as a retail electricity business operator
Received EPC order for Tsukuba Green Power Plant Tsuchiura No. 1 power station
Obtained ISO 14001 certification
Tsuchiura No. 1 power station began operation
Joined RSPO (Roundtable on Sustainable Palm Oil)
Began supplying 100% renewable electricity to Setagaya Ward Office (first among local governments in Japan); established JCSBG
Began local production for local consumption project in Kyoto Prefecture; supplied 100% renewable electricity to Marui Kashiwa and Kashiwa Modi stores
Began supplying 100% renewable electricity to Tokyo Metropolitan Government Building
Registered as a power generation business operator
Products and positioning
A renewable-energy specialist providing stable, domestically sourced 100% renewable electricity with a focus on public-sector supply and local production for local consumption.
Renewable electricity retail supply
Supply of renewable electricity to public institutions, corporations, and individuals.
Power generation
Owned generation assets totaling approximately 230 MW, including solar, wind, geothermal, biomass, and hydro.
Aggregation
Aggregation of renewable energy sources from over 500 power plants with total contracted capacity exceeding 2,000 MW.
Sources5 sources
Cite this profile: Cite the canonical profile. /brand-wiki/zero-watt-power · Editorial policy · How profiles are compiled