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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.
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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 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.
Manapōuri 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 ...
[5]: 222 The headrace tunnel, completed in 1980, and the access tunnel to the power station, completed in 1976, were both built by Codelfa-Cogefa. [5]: 232 After passing through Rangipō Power Station, the water flows through the 3-kilometre (1.9 mi) Rangipō Tailrace Tunnel to the Poutū Intake at Beggs Pool on the Tongariro River.
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]
The tailrace feeds back into the Allt Mor. A buried cable carries the generated power away to a transformer, connecting the scheme to the 33 kV network on Arran. The cost of the project was around £315,000, and it had to be completed by 19 December 2015 in order to qualify for the feed-in tariffs negotiated at the beginning of the project. The ...