At a Glance
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
The Patea Dam is too large and high to install an effective upstream fish pass, so Trustpower has an active trap and transfer programme to assist native fish migration.
The dam does include an adult eel bypass and we also time the spillway gate operations to assist with downstream migration when it is migration season and weather conditions indicate there are likely to be migrating adult eels.
In 2017, our Taranaki generation team won a Taranaki Regional Council Environmental Award, 'Te Taiao me te Pākihi – Environmental Leadership in Business' for trapping and successfully transferring migrating native fish and increasing biodiversity in the headwaters of the Patea catchment.
Lake Rotorangi is a popular recreational lake in South Taranaki, particularly over the summer months.
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
Full Hazard Survey
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.