Welcome to Trustpower. The browser that you are currently using is not supported by this site. For best results please upgrade your browser.
Retrieving Data

Motukawa Power Scheme

View Map
  • Motukawa Power Scheme
  • Branch River Power Scheme
  • Bream Bay Power Station
  • Burrinjuck Power Station
  • Cobb Power Station
  • Coleridge Power Station
  • Dillmans Power Scheme
  • Esk Power Scheme
  • Highbank Power Scheme
  • Highbank Pumping Station
  • Hinemaiaia Power Scheme
  • Hume Power Station
  • Kaimai Power Scheme
  • Keepit Power Station
  • Mangorei Power Station
  • Matahina Power Scheme
  • Kaniere Forks/McKays Creek Power Scheme
  • Arnold Power Station
  • Paerau/Patearoa Power Stations
  • Patea Power Scheme
  • Wahapo Power Scheme
  • Waihopai Power Station
  • Waipori Power Scheme
  • Wheao and Flaxy Power Scheme
  • 1910
  • 1920
  • 1930
  • 1940
  • 1950
  • 1960
  • 1970
  • 1980
  • 1990
  • 2000
  • 2010
  • 2020

Motukawa Hydroelectric Power Scheme makes use of water from the Manganui and Waitara Rivers in the North Island of New Zealand. The Scheme was commissioned in 1927 and has three generating sets with over 70 years of reliable operation, plus a modern turbine. The Scheme produces an average annual power output of 22 GWh. An upgrade project, which was completed in 2010, enhanced the efficiency of the Station by 15%.

At a Glance

LOCATION: Manganui/Waitara Rivers

Commissioned 1927

Max Capacity 5 MW

Annual output 22 GWh

The Motukawa Scheme makes use of 99 metres (m) of elevation difference between the Manganui and Waitara Rivers to drive three generating sets, the last one was added in 1938. 

In recent years, we have made significant efficiency enhancements. In 2005, we installed a 200 kW turbine in the Motukawa water race, taking advantage of the natural fall in the supply race system. In 2007, we installed pumps to lift water about 4m out of the Mangaotea Stream into the Lake Ratapiko supply race. These improvements added to the scheme’s power output — and help make better use of the natural resource. 

An upgrade project, which was completed in 2012, enhanced the efficiency of the Station by 15%. Our state-of-the-art computer fluid dynamics modelling, suggested an 8-10% efficiency gain will be achieved. The upgrade will also mean our equipment is set to perform for many years to come. 

Environment and recreation 

When there’s a lot of rain, the Scheme’s diversion canal drains an adjacent catchment so Lake Ratapiko, formed by the dam, rises to spilling level. 

Eel and fish are currently unable to pass through the Scheme. However, there’s a successful trap and transfer programme for Longfin Eel, supporting the species’ migration. We are funding extensive riparian planting in catchment areas to improve water quality and fish habitat. 

We gained new Resource Consents in 2001, consents will again be due for renewal in 2022.

Inside Motukawa Powerhouse
Inside Motukawa Powerhouse

Our stations