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In relation to rural development, the simplicity and low relative cost of micro hydro systems open up new opportunities for some isolated communities in need of electricity. With only a small stream needed, remote areas can access lighting and communications for homes, medical clinics, schools, and other facilities. [ 16 ]
Although the cost of small hydro projects are generally far lower than large-scale hydroelectric systems, there is a cost to construction. Considering this, if a small hydro project proves to be uneconomical it will have an outsized budget expenditure relative to large projects which run over-budget. [26]
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.
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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]
Zengamina is a small hydroelectric power generation plant near Kalene Hill, Ikelenge District in northwestern Zambia. It was built between 2004 and 2008 at a cost of about $3 million, or $4,285 per kilowatt of power.
Harangi hydroelectric project was set up by Energy Development Company Limited (EDCL) on the Left bank of Harangi Dam, parallel to left bank irrigation canal. The 9 megawatt (2×4.5 MW) project was started in April 1997, and was fully into commercial operation by July 1999. It falls under the "Small" category of hydropower projects (3-25 MW).
The hydraulic head either occurs naturally, such as a waterfall, or is created by constructing a dam in a river valley, creating a reservoir. Using a controlled release of water from the reservoir drives the turbines. The costs and environmental impacts of constructing a dam can make traditional hydroelectric projects unpopular in some countries.