Major electric power companies Japan 2023, by total assets

As of March 2023, Tokyo Electric Power Company topped the ranking of electric power companies in Japan, with total assets worth around 13.56 trillion Japanese yen. The electric utility company, also known as TEPCO, was founded in 1951 and mainly supplies the Kanto region, including the Tokyo area.  Tokyo Electric Power Company Holdings, Inc. TEPCO is known for the nuclear accident at its Fukushima Daiichi Nuclear Power Plant in Fukushima Prefecture, which was caused by the Tohoku earthquake and the following tsunami in 2011. Even though most Japanese people disapproved of how TEPCO handled the disaster, the Japanese government supported the company financially to ensure the electric power supply for Tokyo. In recent years, the company started to generate electricity using nuclear reactors again. Furthermore, it is expanding its renewable energy segment, including hydropower, thermal power, and wind farms.  Electricity market in Japan  The Japanese electricity market was dominated by ten regional electric companies. Competition remained limited since retailers of low voltage electricity mainly sell their electricity locally to homes and small shops. The nuclear disaster in 2011 affected the electricity market insomuch as natural gas and coal replaced nuclear energy as sources with the largest share of the electricity production. Since Japan depends on imports for fossil fuels, this caused the decline of the self-sufficiency rate of primary energy, and an increase in electricity rates for homes. The current energy policy therefore aims to diversify the energy mix, including renewable and nuclear energy. In recent years, the share of renewable energy in electricity production increased to over 20 percent.

截至2023年3月，东京电力公司位居日本电力公司之首，总资产价值约为13.56万亿日元。该公司，亦称TEPCO，成立于1951年，主要供应关东地区，包括东京地区。东京电力控股股份有限公司，即TEPCO，因福岛县福岛第一核电站的核事故而闻名，该事故由2011年的东日本大地震及随后的海啸引发。尽管大多数日本民众对TEPCO处理灾难的方式表示不赞同，但日本政府仍从财政上支持该公司，以确保东京的电力供应。近年来，该公司开始重新利用核反应堆发电。此外，它还在拓展可再生能源领域，包括水力发电、火力发电和风力发电。日本电力市场由十个地方电力公司主导。由于低压电零售商主要在其本地向家庭和小商铺销售电力，因此竞争一直受限。2011年的核灾难对电力市场产生了影响，天然气和煤炭取代了核能，成为电力生产中份额最大的能源来源。鉴于日本依赖进口化石燃料，这导致了初级能源自给率的下降，以及家庭电费的上涨。因此，当前能源政策旨在多元化能源结构，包括可再生能源和核能。近年来，可再生能源在电力生产中的比例已增至超过20%。