Northland Region

Wairua Hydro Station

Name: Wairua Hydro Station
Consent Holder: Northland Limited
Consent Duration and Review: Expires 31 May 2020
Fish Passage: Yes
Target: Upstream migrating fish and downstream migration of eels

The Wairua power station owned by Northpower was first built in the early 1900’s with this first of the generators installed in 1916. The water canal intake was upgraded in 2009. The new weir flap gates allow better water management of the river in flood situations and reduced maintenance costs. The power station’s aging control system has also been replaced to maximise output and reduce outages.

A 4th generator was installed at the site in 2007 and with the latest improvements to the canal walls, control systems and increased capacity (5MW or 50,000 100 watt light bulbs) the power station can now run at its optimum level. This work has also resulted in a station that is now a solid robust structure and the life of the asset has also been extended well into the future. The maximum half hourly system demand on Northpower’s network is approximately 147 MW drawing supply from Transpower’s national grid at five main substations:

  • Maungatapere - 45 MW
  • Bream Bay - 45 MW
  • Dargaville - 12 MW
  • Maungaturoto - 18 MW
  • Kensington - 65 MW












Report Prepared for
Wai Maori Trustee Limited
By LMK Consulting Ltd
10 October 2014

Download full report. (PDF - 1.4MB)




In April 2013, the Parliamentary Commissioner for the Environment released a report into the status of long-fin eel in New Zealand. This was followed up by an independent review from the Ministry for Primary Industries. These and other related documents can be found on our website. Click here.


Northland Region

Wairua Hydro Station

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