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Over the last several years, the Japanese government has announced energy policies aimed to achieve carbon neutrality, or net-zero greenhouse gas (GHG) emissions, by 2050 by lowering emissions in the electric power, industrial, and transportation sectors. In the electric power sector, government policies set 2030 targets, which include accelerated investment in renewable capacity, increased use of nuclear generation, and reduced use of fossil fuels for electricity generation. Japan''s government called the package of energy policies and their targets "ambitious." Energy security considerations may affect the progress and pace of decarbonization in the electric power sector.
Japan''s 6th Strategic Energy Plan (released in 2021) and the GX (Green Transformation) Decarbonization Power Supply Bill (released in 2023) target increasing the share of non-fossil fuel generation sources to 59% of the generation mix by 2030 compared with 31% in 2022. Policies target an increase in the share of renewable generation sources including solar, wind, hydropower, geothermal, and biomass from 26% in 2022 to 36%–38% by 2030 and an increase in the share of nuclear generation from 5% in 2022 to 20%–22% by 2030.
Generation by fossil fuels (natural gas, coal, and petroleum) is set to decline from 69% in 2022 to 41% by 2030. The policies also could expand hydrogen and ammonia use in natural gas and coal co-fired power generation, in difficult-to-electrify end-use sectors, and in advanced carbon capture and storage technology development.
The targeted increase in renewable generation is paired with broad encouragement of battery storage. According to Japan''s 6th Strategic Energy Plan, battery storage will be increased as a distributed source of electricity closer to end users and within microgrids.
This new policy calls for an increase in installed solar capacity from 79 gigawatts (GW) in 2022 to 108 GW by 2030. Initiatives include installing solar capacity on 50% of government buildings (6 GW), on corporate buildings and parking garages (10 GW), and on public land and promotion areas (4 GW). The targeted increase in Japan''s wind capacity focuses on increasing offshore capacity from 0.14 GW in 2022 to 10 GW by 2030. In March 2024, the Japanese government approved a draft amendment to allow offshore wind turbines to be installed in Japan''s exclusive economic zone.
From 2018 to 2022, the share of nuclear generation remained at about 5% of total generation in Japan. Lawmakers approved the GX Decarbonization Power Supply Bill, which effectively maintains existing legal provisions that allow nuclear reactors to operate beyond the 40-year license to 60 years of operation. The bill also designated nuclear power as a main component of the country''s baseload electricity generation. Japan also intends to maximize the use of existing reactors by restarting as many units as possible.
Japan''s government has encouraged a collaborative effort between manufacturers and electric utilities to develop next-generation reactors, signaling a sustained role for nuclear power in Japan''s electricity mix.
Before 2011, nuclear power accounted for about 30% of Japan''s electricity mix, and the government had planned to increase that share to over 40% by 2017. After the 2011 Fukushima Daiichi accident, the Japanese government suspended operation of all nuclear reactors for mandatory inspections and safety upgrades. The reactors were systematically taken offline during planned refueling and maintenance outages; the last two units were suspended in 2013.
About Japan energy storage for renewable energy
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