# Geothermal power in Japan

Japan has favorable sites for geothermal power because of its proximity to the Izu–Bonin–Mariana Arc. Japan's geothermal energy sector leverages the nation's volcanic activity, which positions it among countries with high potential for renewable energy development Geography of Japan along the Pacific Ring of Fire, combined with its abundance of active volcanoes, creates ideal conditions for the development of geothermal power plants.
In 2007, Japan had 535.2 MW of installed electric generating capacity, about 5% of the world total. Geothermal power plays a minor role in the energy sector in the country: in 2013 it supplied 2596 GWh of electricity, representing about 0.25% of the country's total electricity supply.
Development of new geothermal power stations essentially stopped since the mid 1990s, mainly due to the strong resistance from local communities. Most of the potential sites are located in government-protected areas and in tourist destinations, traditional hot springs or onsen. Hot springs are a key feature of Japan's onsen culture and are considered in discussions regarding energy policy and geothermal development due to their cultural and economic significance. Local communities in these areas, which frequently rely on tourism revenue from onsen, have raised concerns about the potential effects of geothermal projects on the landscape and the tourism industry. The Sumikawa Geothermal Power Station, located in Towada-Hachimantai National Park, is one of the eighteen geothermal power sites in Japan and one of seven in the northern Honshu region (Tohoku). Since 1995, the Sumikawa Geothermal Power Station has consistently provided 50,000 kW of electrical energy and hot water. The power generated by the Sumikawa Geothermal Power Station supports the city of Kazuno, home to 32,000 residents, as well as its surrounding areas.
Geothermal energy has been increasing in recent years due to the Japanese energy crisis following the Fukushima disaster and the subsequent closure of most of the country's nuclear power stations. Businesses and the government are currently considering over 60 possible sites for new geothermal power development. Estimates put the total capacity potential of geothermal power at 23 GW, the third largest amount in the world after the United States and Indonesia. Given Japan's current energy challenges and commitment to reducing greenhouse gas emissions, it is noteworthy that the geothermal potential has not been more extensively explored. Japan ranks third in the world in terms of geothermal potential, with more than 100 volcanoes contributing to its energy prospects. List of volcanoes in Japan.

## History

The country's first experimental geothermal power station was opened in 1925 in Beppu, Ōita Prefecture. However, research in geothermal energy was slowed down by the Second World War. The first full scale geothermal power generation plant was Matsukawa in Iwate Prefecture, owned by Nihon Heavy Chemical Industry Corp. The plant started operating in 1966 with a capacity of 9.5 MW. In 1967, Otake Geothermal Power station in Ōita Prefecture, owned by Kyushu Electric Power, launched with 11 MW. After these first generation facilities, which were considered large scale experimental plants, from the mid-1970s new generation more efficient geothermal plants were opened. Until the mid-1980s, these were typically mid-sized plants with capacities of around 50 MW. Starting from the late 1980s more advanced technologies allowed for the economical exploration and development of even smaller geothermal resources, allowing the launch of several smaller scale plants. Total generation reached 500 MW in 1996.
In April 2011, Japanese Ministry of the Environment issued a "Study of Potential for the introduction of Renewable Energy" report. It has shown total 19.14GW of Japanese geothermal resource potential.

## Power stations

As of 2022, Japan operates 98 geothermal power plants with a combined capacity of approximately 540 MW. The Matsukawa Geothermal Power Plant, which began operations in 1966, was the first geothermal plant in Japan and has a capacity of 23.5 MW. The Hatchobaru Geothermal Power Plant is currently the largest geothermal facility in the country, with a total capacity of 110.2 MW.
| Name | Capacity (MWe) | Year | Notes |
| Mori | 50 | 1982 | |
| Onuma | 9.5 | 1974 | |
| Sumikawa | 50 | 1995 | |
| Matsukawa | 23.5 | 1966 | |
| Kakkonda 1 & 2 | 80 | 1978–1995 | |
| Uenotai | 28.8 | 1994 | |
| Onikobe | 15 | 1975 | |
| Yanaizu-Nishiyama | 65 | 1995 | |
| Hachijō-jima | 3.3 | 1999 | |
| Suginoi | 1.9 | 1981 | |
| Takigami | 25 | 1996 | |
| Otake | 12.5 | 1967 | |
| Hatchōbaru 1 & 2 | 112 | 1977–2006 | |
| Kujū | 0.99 | 1998 | |
| Takenoyu | 0.1 | 1991 | closed |
| Kirishima-kokuksai | 0.1 | 1984 | currently stopped |
| Ogiri | 30 | 1996 | |
| Yamagawa | 30 | 1995 | |

## Technology

Japan has developed advanced technologies for the exploration, development, utilization and monitoring of geothermal resources. Due to the stagnant domestic geothermal sector, most of the technologies have been used in overseas development in recent years. Japan provided about 67% of all the turbines used in geothermal power stations in the world in the last 10 years.