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The Waikato River is the longest river in New Zealand, running for 425 kilometres (264 mi) through the North Island. It rises on the eastern slopes of Mount Ruapehu , joining the Tongariro River system and flowing through Lake Taupō , New Zealand's largest lake.
The power house is in a cavern, while two tailrace tunnels take the water from the power house 10 km (6 mi) to Deep Cove and the sea. The Manapouri Control Structure (Mararoa dam) downstream from the original outlet of Lake Manapouri controls the lake level, and feeds water from the Mararoa river back up the river into the Lake.
The Ōhakuri Dam is a dam and hydroelectric power station on the Waikato River, central North Island, New Zealand, midway between Taupō, Rotorua and Hamilton. Its dam is about 5 kilometres (3.1 mi) upstream of the Atiamuri Dam. It was commissioned in 1961 and construction was organised from the 'hydro town' of Mangakino. [2]
It is the fifth of the eight hydroelectric power stations on the Waikato River, and at 360 MW, is the largest hydroelectric station on the Waikato. The station has two powerhouses - Maraetai I powerhouse is directly in front of the Maraetai Dam, while Maraetai II powerhouse is located 550 metres (1,800 ft) downstream of Maraetai I.
Before construction of the dam and hydro station, the Aratiatia Rapids were a prominent feature on the Waikato River, and became a scenic reserve in 1906. [1] The dam construction meant that no water flowed over the rapids. However, several times a day, the Aratiatia dam gates are opened, which restores the rapids to their normal operation. [2]
Construction of the dam and power station began in 1940, but a materials and labour shortage due to World War II meant progress was slow. The station was completed in 1947, four years behind schedule. [3] The creation of Lake Karapiro behind the dam flooded the Horahora Power Station, the first power station built on the Waikato River.
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It is the first hydroelectric power station on the Waikato River, and is located 13 kilometres (8.1 mi) downstream of Lake Taupō. Aratiatia is owned and operated by Mercury Energy. [1] [2] Aratiatia is a largely run-of-the-river station, as it generates electricity from water from the Lake Taupō control gates and to the Ōhakuri Power Station ...