JAPAN Law and Practice Contributed by: Yutaro Fujimoto, Yurika Masakane, Hirokazu Tanaka and Yutaro Kato, Nagashima Ohno & Tsunematsu
Nagashima Ohno & Tsunematsu is one of the fore - most providers of international and commercial legal services based in Tokyo. The firm has over 686 law- yers, including over 71 experienced foreign lawyers from various jurisdictions (as of 1 July 2026). Its over- seas network includes offices in New York, Singa- pore, Bangkok, Ho Chi Minh City, Hanoi, Jakarta and Shanghai, and collaborative relationships with promi-
nent local law firms throughout Asia, Europe, North and South America and other regions. The firm regu- larly advises leading power utilities, trading compa- nies and investors on their energy projects, including all associated regulatory matters, as well as financial institutions on financing for these projects. The firm has dealt with a number of renewable power projects since the introduction of the feed-in tariff in Japan.
Authors
Yutaro Fujimoto is a partner in the energy and infrastructure practice team of Nagashima Ohno & Tsunematsu. He regularly advises on power plant projects (conventional and renewable) and their project
Hirokazu Tanaka is an associate in the energy and infrastructure practice team of Nagashima Ohno & Tsunematsu. He regularly advises on offshore wind farm projects, project finance, relevant market regulations,
finance; start-ups and M&A of electricity retail businesses; wholesale transactions of electricity and gas pursuant to the market regulations; new business such as Corporate PPAs; and provides dispute resolution services in connection with energy businesses. From 2015 to 2017, he worked as the first deputy director at the secretariat office of the Electricity and Gas Market Surveillance Commission of Japan to support its launch and the full liberalisation of the electricity and gas retail markets.
market trading, transactions involving power plants, large-scale power batteries, corporate PPAs, and trading of environmental attributes. From 2024 to 2025, he was seconded to the Wind-Power Policy Office of the Agency for Natural Resources and Energy, where he was responsible for revising the Offshore Wind Promotion Act for the Exclusive Economic Zone of Japan. From 2025 to 2026, he was seconded to the Electricity and Gas Market Surveillance Commission, where he worked on the design and surveillance of electricity market trading. Tsunematsu. He regularly advises on wholesale electricity transactions, electricity retail businesses, transactions involving renewable power plants, corporate PPAs, trading of environmental attributes, and project finance in the energy field. In particular, he has broad knowledge and experience in contractual and regulatory matters regarding the retail supply of electricity and in the regulation of electricity market transactions. Yutaro Kato is an associate in the energy and infrastructure practice team of Nagashima Ohno &
Yurika Masakane is an associate in the energy and infrastructure practice team of Nagashima Ohno & Tsunematsu. She provides legal advice to power retailers, wholesalers and generators on regulatory
compliance, project finance, and energy-related transactions. Her practice spans a wide range of electricity sector matters, including both conventional and renewable power generation, wholesale and retail electricity supply, and regulatory issues concerning transmission and distribution.
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