Whakamaru Power Station
| Whakamaru Power Station | |
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 Location of Whakamaru Power Station in New Zealand
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| Country | New Zealand |
| Location | Lake Whakamaru |
| Coordinates | 38°25′11″S 175°48′30″E / 38.41972°S 175.80833°ECoordinates: 38°25′11″S 175°48′30″E / 38.41972°S 175.80833°E |
| Status | Operational |
| Opening date | 1949 |
| Owner(s) | Mercury Energy |
| Dam and spillways | |
| Impounds | Waikato River |
| Power station | |
| Turbines | 4 |
| Installed capacity | 100 MW |
Whakamaru Power Station is a hydroelectric power station on the Waikato River, in the North Island of New Zealand. It is the fourth hydroelectric power station on the Waikato River.
Lake Whakamaru is one of the larger hydro reservoirs on the Waikato river. The power station is owned and operated by Mercury Energy. The adjacent Whakamaru switching station is operated by Transpower and is one of eight reference nodes on the New Zealand national grid.
Development work started in 1949 with the construction on 10 kilometres (6.2 mi) of road from Mangakino which at the time was the operational centre of the Waikato hydroelectric scheme. Firstly a diversion channel 259 metres (850 ft) long, 31 metres (102 ft) deep and 7 metres (23 ft) wide was built taking 3 years to complete.
The foundation rock turned out to be deeply cracked and filled with clays rendering it partially porous. Shafts were sunk into the rock and this allowed the clay to be cleared and cement grout was later forced into the rock which was then back-filled with concrete.
Whakamaru is a major node in the North Island electricity grid. Electricity generated by Whakamaru, as well as the other five Waikato hydroelectric power stations, and from the geothermal power stations in the area converges at the Whakamaru substation on the western side of the dam. Power from Whakamaru is then transmitted via 220 kV lines to the Bay of Plenty, Hawke's Bay, Manawatu and Hamililton. The largest transmission route is to New Zealand's largest city, Auckland, approximately 200 kilometres (120 mi) to the north - three 220 kV circuits connect Whakamaru to Otahuhu in southern Auckland, with an additional circuit serving Otahuhu via Hamilton.
The main control centre for the electricity generation and transmission system for the entire North Island was established at Whakamaru in 1964. The facility continued to operate as the North Island System Control Centre until a replacement facility was established at Hamilton in 1992.
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