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Inside the Robert-Bourassa generating station, in northern Quebec, the world's largest underground power station, with an installed capacity of 5,616 MW.. An underground power station is a type of hydroelectric power station constructed by excavating the major components (e.g. machine hall, penstocks, and tailrace) from rock, rather than the more common surface-based construction methods.
Stoplogs of a hydro power plant which can close the water flow to the turbine. Stoplogs are modular in nature, giving the operator of a gated structure the ability to control the water level in a channel by adding or removing individual stoplogs. A gate may make use of one or more logs.
But in the case of reaction turbines, if the net head is low and if the turbine is installed above the tail race, there can be appreciable loss in available pressure head to power the turbine. Also, if the pressure of the fluid in the tail race is higher than at the exit of the turbine, a back flow of liquid into the turbine can result in ...
The flow is transferred to Madi River at the tailrace. The powerhouse is semi-underground type located on the bank of the Madi River. [1] The plant is owned and developed by Butwal Power Company Limited, an IPP of Nepal in technical help from UMN. [2] The plant started generating electricity since 2052-01-25 BS.
ManapÅuri Power Station is an underground hydroelectric power station on the western arm of Lake Manapouri in Fiordland National Park, in the South Island of New Zealand. At 854 MW installed capacity (although limited to 800 MW due to resource consent limits [ 3 ] ), it is the largest hydroelectric power station in New Zealand, and the second ...
The flow from Mai Khola is used to generate 6.1 MW electricity. [1] Upper Mai C is a cascade project that uses the discharge from the tailrace of the Upper Mai Hydropower Station and additional discharge from streams that flow into the Mai river. [2] The catchment area at the intake is 70 square kilometres (27 sq mi).
The power plant will contain four Francis pump-turbines which are rated at 260 MW each for power generation and 275 MW for pumping. The upper reservoir will lie at maximum elevation of 796 m (2,612 ft) and the lower at 499 m (1,637 ft). This difference in elevation will afford the power plant a rated hydraulic head of 276 m (906 ft). [10]
In total, the plant has a catchment area of 172.58km2. The project comprises a diversion weir, intake, headrace channel, forebay, penstocks, powerhouse, tailrace, and switchyard. The intake structure is on the right bank of the river and the waterway continues for 1,800 meters in a channel with a box section up to the forebay tank.