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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.
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 ...
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.
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).
[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 two pelton turbine generators of 60 megawatt are fed via a 600 m (2,000 ft) vertical pressure shaft, after passing through the long tailrace tunnel. 68,000 m 3 (2,400,000 cu ft) of earth was cleared to create the underground Uma Oya Power Station cavern. The 120 megawatt power station will generate up to 231 GWh per year. [10]
The power station was completed in 1962, and has 262.1 metres (860 ft) rated head. Water flows through the turbines at the rate of 118.9 cubic metres per second (4,200 cu ft/s). [7] The conventional gravity-fed hydroelectric power station is fed by water held in Tumut Two Pondage and from water discharged from Tumut 1 Power Station.
By 1945 only a small part of the scheme was complete, and power demand had risen during war. The SECV re-examined the scheme from 1947, and in 1948 an augmented program of work was approved. [ 4 ] The size of the main reservoirs was expanded, and the catchment area was increased though the use of open aqueducts.