Fujioka is a city located in Gunma Prefecture, Japan. As of 1 August 2020, the city had an estimated population of 64,539 in 27,616 households, and a population density of 360 persons per km². The total area of the city is 180.29 square kilometres (69.61 sq mi).
Annaka is a city located in Gunma Prefecture, Japan. As of 31 July 2020, the city had an estimated population of 47,911 in 24,749 households, and a population density of 210 persons per square kilometre. The total area of the city is 276.31 km2 (106.68 sq mi).
Kamikawa is a town located in Saitama Prefecture, Japan. As of 1 February 2021, the town had an estimated population of 13,369 in 5774 households and a population density of 280 persons per km2. The total area of the town is 47.40 square kilometres (18.30 sq mi).
Ueno is a village located in Gunma Prefecture, Japan. As of 1 October 2020, the village had an estimated population of 1,149 in 571 households, and a population density of 6.3 persons per km2. The total area of the village is 181.85 square kilometres (70.21 sq mi). The village has the lowest population density of any municipality in Japan.
Naganohara is a town located in Gunma Prefecture, Japan.
Katashina is a village located in Gunma Prefecture, Japan. As of 31 October 2020, the village had an estimated population of 4,314 in 1694 households, and a population density of 11 persons per km2. The total area of the village is 391.76 square kilometres (151.26 sq mi). m2. Much of the village is within the borders of Oze National Park.
Minakami is a town located in Gunma Prefecture, Japan. As of 31 October 2020, the town had an estimated population of 18,383 in 7938 households, and a population density of 24 persons per km2. The total area of the town is 781.08 square kilometres (301.58 sq mi). Much of the town is within the borders of Jōshin'etsu-kōgen National Park.
Kusaki Dam is a dam in the Gunma Prefecture of Japan.
Ueno Dam (上野ダム) is a concrete gravity dam in the Gunma Prefecture of Japan. The dam serves as the lower reservoir of the Kannagawa Hydropower Plant. Because of the dam's remote location deep in the hillside, no houses were submerged.
Yagisawa Dam (矢木沢ダム) is a dam in the Gunma Prefecture of Japan; it supports a 240 MW hydroelectric power station.
Shinsui Dam is a dam in the Gunma Prefecture of Japan, completed in 1968.
Tanbara Dam is a rock-fill embankment dam impounding the headwaters of the Hotchi River, a Tone River tributary in Gunma Prefecture of Japan. It is located 14 kilometres (8.7 mi) north of Numata. It creates the upper reservoir for the 1,200 megawatts (1,600,000 hp) Tamahara Pumped Storage Power Station (玉原発電所). Construction began in 1973 and the dam was complete in 1981 while the power station was commissioned in 1986. It is 116 metres (381 ft) tall and withholds a reservoir with a storage capacity of 14,800,000 m3 (11,999 acre⋅ft). Of that capacity, 13,000,000 cubic metres (11,000 acre⋅ft) is active for power generation. The lower reservoir for the pumped-storage power station is created by the Fujiwara Dam, located 4 km (2 mi) to the northwest on another Tone River tributary. Power is generated during periods of high energy demand and pumping occurs during times when energy demand is low such as at night. The power station contains four 300 megawatts (400,000 hp) reversible Francis turbine pump-generators which serve to both pump water and generate electricity. The upper Tamahara Reservoir is at an elevation of 1,177 metres (3,862 ft) and the lower Fujiwara Reservoir is at 651 metres (2,136 ft) which affords the power station an effective hydraulic head of 518 metres (1,699 ft). When pumping, the pump-generators can move up to 210 cubic metres per second (7,400 cu ft/s) of water and when generating, they discharge up to 276 cubic metres per second (9,700 cu ft/s).
The Kannagawa Hydropower Plant (神流川発電所) is an under construction pumped-storage hydroelectric power plant near Minamiaiki in Nagano Prefecture and Ueno in Gunma Prefecture, Japan. The power plant utilizes the Minamiaiki River along with an upper and lower reservoir created by two dams, the upper Minamiaiki Dam and the lower Ueno Dam. The power station in between the two dams will contain six 470 megawatts (630,000 hp) pump-generators for a total installed capacity of 2,820 megawatts (3,780,000 hp). Unit 1 commenced commercial operation in 2005 and Unit 2 in 2012. When completed, the plant will have the second-largest pumped-storage power capacity in the world.
The Tadami River is a major tributary of the Agano River in Japan. Its basin covers 8,400 km2 (3,243 sq mi) and its main stem is extensively regulated and developed for hydroelectric power. The river is located within Niigata, Gunma and Fukushima Prefectures.
The Kumano River is a river in the Kii Peninsula of central Japan, located in Nara, Wakayama and Mie Prefectures. It is 183 kilometres (114 mi) long and has a watershed of 2,630 square kilometres (1,020 sq mi).
Hydroelectricity is currently China's largest renewable energy source and the second overall after coal. According to the International Hydropower Association, China is the worlds largest producer of hydroelectricity as of 2021. China's installed hydroelectric capacity in 2021 was 390.9 GW, including 36.4 GW of pumped storage hydroelectricity capacity, up from 233 GW in 2011. That year, hydropower generated 1,300 TWh of power, an increase of 68 TWh over 2018 when hydropower generated 1,232 TWh of power, accounting for roughly 18% of China's total electricity generation.
Sanbaseki Gorge is a ravine on the Kanna River in the city of Fujioka, Gunma Prefecture, and the town of Kamikawa, Saitama Prefecture, Japan. It has been designated a National Place of Scenic Beauty and a Natural Monument since 1957.
