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Tamahara Dam
Tanbara Dam (玉原ダム, which can be mistakenly read Tamahara 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 north of Numata. It creates the upper reservoir for the 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 tall and withholds a reservoir with a storage capacity of . Of that capacity, is active (or useful) for power generation. The lower reservoir for the pumped-storage power station is created by the Fujiwara Dam, located 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 reversible Francis turbine pump-generators which serve to both pump water and generate electricity. The upper Tamah ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numata, Gunma
is a Cities of Japan, city located in Gunma Prefecture, Japan. , the city had an estimated population of 46,908 in 20,589 households, and a population density of 110 persons per km². The total area of the city is , making it the largest city in terms of area within Gunma Prefecture. (The neighboring town of Minakami, Gunma, Minakami is the largest municipality in terms of area within Gunma.) Geography Numata is located in northern Gunma Prefecture. The Tone River flows through the western part of the city and the tributary, the Katashina River, flows through the southern end, forming a large fluvial terrace, river terrace. The downtown area is located at the top of the terrace, along the Tone River. *Mountains: Kesamaruyama (1961m), Mount Akagi (1828m) *Rivers: Tone River, Katashina River Surrounding municipalities Gunma Prefecture * Kiryū, Gunma, Kiryū * Shibukawa, Gunma, Shibukawa * Maebashi, Gunma, Maebashi * Midori, Gunma, Midori * Minakami, Gunma, Minakami * Katashina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TEPCO
, also known as or TEPCO, is a Japanese electric utility holding company servicing Japan's Kantō region, Yamanashi Prefecture, and the eastern portion of Shizuoka Prefecture. This area includes Tokyo. Its headquarters are located in Uchisaiwaicho, Chiyoda, Tokyo, and international branch offices exist in Washington, D.C., and London. It is a founding member of strategic consortiums related to energy innovation and research; such as JINED, INCJ and MAI. In 2007, TEPCO was forced to shut the Kashiwazaki-Kariwa Nuclear Power Plant after the Niigata-Chuetsu-Oki earthquake. That year it posted its first loss in 28 years. Corporate losses continued until the plant reopened in 2009. Following the 2011 Tōhoku earthquake and tsunami, one of its power plants was the site of one of the world's most serious ongoing nuclear disaster, the Fukushima Daiichi nuclear disaster. TEPCO could face ¥ ($) in special losses in the current business year to March 2012, and the Japanese government ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Pump-turbine
The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency. The process of arriving at the modern Francis runner design took from 1848 to approximately 1920. It became known as the Francis turbine around 1920, being named after British-American engineer James B. Francis who in 1848 created a new turbine design. Francis turbines are primarily used for producing electricity. The power output of the electric generators generally ranges from just a few kilowatts up to 1000 MW, though mini-hydro installations may be lower. The best performance is seen when the head height is between . Penstock diameters are between . The speeds of different turbine units range from 70 to 1000 rpm. A wicket gate around the outside of the turbine's rotating runner controls the rate of water flow through the turbine for d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Embankment Dam
An embankment dam is a large artificial dam. It is typically created by the placement and compaction of a complex semi-plastic mound of various compositions of soil or rock. It has a semi-pervious waterproof natural covering for its surface and a dense, impervious core. This makes the dam impervious to surface or seepage erosion. Such a dam is composed of fragmented independent material particles. The friction and interaction of particles binds the particles together into a stable mass rather than by the use of a cementing substance. Types Embankment dams come in two types: the earth-filled dam (also called an earthen dam or terrain dam) made of compacted earth, and the rock-filled dam. A cross-section of an embankment dam shows a shape like a bank, or hill. Most have a central section or core composed of an impermeable material to stop water from seeping through the dam. The core can be of clay, concrete, or asphalt concrete. This type of dam is a good choice for sites wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tone River
The is a river in the Kantō region of Japan. It is in length (the second longest in Japan after the Shinano) and has a drainage area of (the largest in Japan). It is nicknamed Bandō Tarō (); ''Bandō'' is an obsolete alias of the Kantō Region, and ''Tarō'' is a popular given name for an oldest son. It is regarded as one of the "Three Greatest Rivers" of Japan, the others being the Yoshino in Shikoku and the Chikugo in Kyūshū. Geography The source of the Tone River is at () () in the Echigo Mountains, which straddle the border between Gunma and Niigata Prefectures in Jōshin'etsu Kōgen National Park. The Tone gathers tributaries and pours into the Pacific Ocean at Cape Inubō, Choshi in Chiba Prefecture. Tributaries Major tributaries of the Tone River include the Agatsuma, Watarase, Kinu, Omoi, and the . The Edo River branches away from the river and flows into Tokyo Bay. History The Tone River was once known for its uncontrollable nature, and its r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gunma Prefecture
is a prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 (1 October 2019) and has a geographic area of 6,362 km2 (2,456 sq mi). Gunma Prefecture borders Niigata Prefecture and Fukushima Prefecture to the north, Nagano Prefecture to the southwest, Saitama Prefecture to the south, and Tochigi Prefecture to the east. Maebashi is the capital and Takasaki is the largest city of Gunma Prefecture, with other major cities including Ōta, Isesaki, and Kiryū. Gunma Prefecture is one of only eight landlocked prefectures, located on the northwestern corner of the Kantō Plain with 14% of its total land being designated as natural parks. History The ancient province of Gunma was a center of horse breeding and trading activities for the newly immigrated continental peoples. The arrival of horses and the remains of horse tackle coincides with the arrival of a large migration from the mainland. From this point forward, the hor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pumped-storage
Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. The method stores energy in the form of gravitational potential energy of water, pumped from a lower elevation reservoir to a higher elevation. Low-cost surplus off-peak electric power is typically used to run the pumps. During periods of high electrical demand, the stored water is released through turbines to produce electric power. Although the losses of the pumping process make the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of peak demand, when electricity prices are highest. If the upper lake collects significant rainfall or is fed by a river then the plant may be a net energy producer in the manner of a traditional hydroelectric plant. Pumped-storage hydroelectricity allows energy from intermittent sources (such as solar, wind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fujiwara Dam
is a gravity dam on the Tone River in Gunma Prefecture of Japan. It is located north of Minakami. It was constructed between 1951 and 1957. The dam itself supports a single Francis turbine hydroelectric generator with a 23 MW capacity which was commissioned in 1957. The reservoir created by the dam serves as the lower reservoir for the 1,200 Tamahara Pumped Storage Power Station which was commissioned in 1986. The dam is high and withholds a reservoir with a storage capacity. See also *List of power stations in Japan *List of pumped-storage hydroelectric power stations The following page lists all pumped-storage hydroelectric power stations that are larger than in installed generating capacity, which are currently operational or under construction. Those power stations that are smaller than , and those that ar ... References {{Dams in Gunma Prefecture Dams in Gunma Prefecture Hydroelectric power stations in Japan Gravity dams Dams completed in 1957 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Turbine
The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency. The process of arriving at the modern Francis runner design took from 1848 to approximately 1920. It became known as the Francis turbine around 1920, being named after British-American engineer James B. Francis who in 1848 created a new turbine design. Francis turbines are primarily used for producing electricity. The power output of the electric generators generally ranges from just a few kilowatts up to 1000 MW, though mini-hydro installations may be lower. The best performance is seen when the head height is between . Penstock diameters are between . The speeds of different turbine units range from 70 to 1000 rpm. A wicket gate around the outside of the turbine's rotating runner controls the rate of water flow through the turbine for d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Power Stations In Japan ...
This page is a list of power stations in Japan that are publicly or privately owned. List Former power station * Senju Thermal Power Station See also *Electricity sector in Japan *Energy in Japan *List of largest power stations in the world References {{Economy of Japan Japan Power stations Power stations A power station, also referred to as a power plant and sometimes generating station or generating plant, is an industrial facility for the generation of electric power. Power stations are generally connected to an electrical grid. Many pow ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Pumped-storage Hydroelectric Power Stations
The following page lists all pumped-storage hydroelectric power stations that are larger than in installed generating capacity, which are currently operational or under construction. Those power stations that are smaller than , and those that are decommissioned or only at a planning/proposal stage may be found in regional lists, listed at the end of the page. List of plants larger than 1000 MW capacity The table below lists currently operational power stations. Some of these may have additional units under construction, but only current installed capacity is listed. Under construction This table lists future 1,000 MW or larger stations that are under construction; some may be partially operational with a current installed capacity under 1,000 MW. See also * List of energy storage projects * List of hydroelectric power station failures * Lists of hydroelectric power stations * List of largest power stations * United States Department of Energy Global Ener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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