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Ōhau B hydro station

Ōhau B is a hydro station located in the Mackenzie Basin, New Zealand.

It has four 55.5 megawatt generating units, and a generation output of up to 212 megawatts.

Ōhau B generates enough electricity each year for about 115,000 average New Zealand homes.

Ōhau B is a twin station with Ōhau C, and both hydro stations have the same generating capacity and use similar equipment.

Water from Lake Ruataniwha flows through Ōhau B, then goes into the Ōhau C canal, which takes it to the Ōhau C power station and out into Lake Benmore.

Building Ōhau B

Ōhau B was built as part of the Upper Waitaki hydro scheme, which began in 1968.

The Upper Waitaki hydro scheme involved building four hydro stations, along with two dams and six canals totalling 56 kilometres.

Ōhau B and C were the last hydro stations to complete the Waitaki hydro scheme.

Key dates

  • 1977 Construction begins
  • 1984 Ōhau B fully operational

Meridian Power Up community fund

Our Power Up community fund supports local projects in the areas where we have wind farms and hydro stations. It’s one of the ways that we recognise the importance of local communities to our operations.  

If you’re based near a Meridian hydro station and have a project you’d like to get off the ground, apply now!