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An additional defining feature of small hydro is known as run-of-river, or that the physical impact of the project is relatively minuscule compared to major hydroelectric dams which require a water storage lake. Little water is stored behind the project, if at all, and the river is usually able to continue flowing.
The Hoover Dam in Arizona and Nevada was the first hydroelectric power station in the United States to have a capacity of at least 1,000 MW upon completion in 1936. Since then numerous other hydroelectric power stations have surpassed the 1,000 MW threshold, most often through the expansion of existing hydroelectric facilities.
Previous upstream dams and reservoirs were part of the 1980s James Bay Project. There are also small and somewhat-mobile forms of a run-of-the-river power plants. One example is the so-called electricity buoy, a small floating hydroelectric power plant. Like most buoys, it is anchored to the ground, in this case in a river.
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At the time it was by far the largest hydroelectric plant in the state. [1] In 1924 it was rebuilt as a 60 cycle plant with 15,000 kilowatts (up from the original 10,500 kW). [2] In 1957 it was raised to regulate the flow from the larger Buford Dam, 36 miles (58 km) upstream, in order to give Atlanta water during the hours it was needed most. [3]
The power station is a run of river, hydropower installation, with capacity of 90 Megawatts. The design calls for the waters of River Tana to be diverted through a "dug-out channel" and then delivered to the power-generation site, thereby reducing the "displacement of communities".
A pico hydro system made by the Sustainable Vision project from Baylor University [1]. Pico hydro is a term used for hydroelectric power generation of under 5 kW. These generators have proven to be useful in small, remote communities that require only a small amount of electricity – for example, to power one or two fluorescent light bulbs and a TV or radio in 50 or so homes. [2]
A small station was also installed on Lake Tekapo, but although it has a small dam to raise the pre-existing lake, water was taken through a 1.6 km (1 mi) tunnel to a powerstation below the level of the lake. In the 1960s, work was started on the Upper Waitaki project.