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Patea Power Scheme

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  • Patea Power Scheme
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  • Branch River Power Scheme
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  • Coleridge Power Station
  • Dillmans Power Scheme
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  • Highbank Power Scheme
  • Highbank Pumping Station
  • Hinemaiaia Power Scheme
  • Kaimai Power Scheme
  • Mangorei Power Station
  • Matahina Power Scheme
  • Kaniere Forks/McKays Creek Power Scheme
  • Motukawa Power Scheme
  • Paerau/Patearoa Power Stations
  • Arnold Power Station
  • Wahapo Power Scheme
  • Waihopai Power Station
  • Waipori Power Scheme
  • Wheao and Flaxy Power Scheme
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Trustpower’s Patea Hydroelectric Power Scheme is on Patea River in the central North Island of New Zealand. The 82 metre (m) high compacted earth fill dam is New Zealand’s fourth highest dam; while the dam creates Lake Rotorangi, New Zealand’s longest man-made lake. Patea Station has an average annual power output of 108 GWh.

At a Glance

LOCATION: Lake Rotorangi

Commissioned 1984

Max Capacity 32 MW

Annual output 108 GWh

The Patea Scheme began producing power in 1984. The dam was the first to be built in New Zealand using tertiary sandstone and siltstone as fill materials. Behind the dam, Lake Rotorangi is approximately 46 kilometres long. 

The Scheme has three vertical Francis turbine and generator sets and one residual flow generator. Total capacity is 32 MW and the average annual output is 108 GWh. 

Environment and recreation 

There’s a significant Longfin Eel fishery upstream and downstream of Patea Dam. There’s no fish pass, so we fund an active trap and transfer programme. We also time the spillway gate operations to assist downstream migration of eels. 

Please refer to the attached Hazard Maps below, which show the Lake's areas hazardous for boating. These maps identify areas of shallow water depth and submerged hazards considered dangerous to recreational lake users during times of low lake levels. This survey was undertaken in 2011, as required by Trustpower's resource consent.

Lake Rotorangi Hazard Map 1
Lake Rotorangi Hazard Map 2

New Resource Consents for the Patea Scheme were gained in 2008 and will expire in the year 2040.

Patea Lake Level 

Please click here to view Patea Lake levels.

Patea Powerhouse and Spillway
Patea Powerhouse and Spillway

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