Waikato Region

The Waikato Region hosts two substantial hydroelectric schemes, the Tongariro Power Scheme and the Waikato River Hydroelectric Scheme.

Tongariro Power Scheme

Name: Tongariro Power Scheme
Consent Holder: Genesis Energy Limited
Consent Duration and Review: 1 December 2039
Fish Passage: No

The Tongariro Power Scheme (1400 GWh) diverts water from the south side of Mount Ruapehu and the west and north sides Mount Tongariro. This leads into the Tongariro River and eventually into the Waikato River. The scheme is comprised of:

  • Rangipo (underground cavern)
  • Tokaanu
  • Moawhango
Tokaanu Power Station by Ulrich Lange, Bochum, Germany - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons
Tokaanu Power Station

Waikato Hydro System Consents

Name: Waikato River Hydroelectric Scheme (from Lake Taupo Control Gates to Lake Karapiro)
Consent Holder: Mighty River Power
Consent Duration and Review: 12 April 2041
Fish Passage: Yes
Target: Eels

The Waikato is a series of hydrostations starting from Lake Taupo. The river has a series of eight dams and nine hydroelectric power stations that generate electricity for the national grid. The power scheme begins at Lake Taupo, which has control gates to regulate the flow of water into the river. Once released through the gates it takes over 18 hours for the water to flow to the last power station at Karapiro. On its journey downstream it passes through power stations at Aratiatia, Ohakuri, Atiamuri, Whakamaru, Maraetai, Waipapa, Arapuni and Karapiro. Approximately 4000 (GWh) of electricity is generated annually by the scheme, which is around 13% of New Zealand's total electrical generating capacity.

Aratiatia Rapids with opened spill gates by Pseudopanax at en.wikipedia - Own work. Licensed under Public Domain via Wikimedia Commons
Aratiatia Rapids with opened spill gates



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

Waikato Region

Tongariro Power Scheme

Waikato Hydro Systems Consents

Bay of Plenty Region

Aniwhenua Scheme

Matahina Scheme

Kaimai Scheme

Taranaki Region

Motukawa Dam

Mangorie Dam

Patea Dam

Hawkes Bay Region

Lake Waikaremoana Power Scheme

Otago Region

Clyde Dam

Roxburgh Dam

Marlborough Region

Waihopai Schemes

Branch River Schemes

West Coast Region

Lake Wahapo

Canterbury Region

Canterbury Hydro Stations

Rakaia River

Lake Tekapo

Ohau River

Lake Pukaki

Lake Benmore Dam

Lake Waitaki (Aviemore) Dam

Lake Ohau

Transpower New Zealand Global Consent

Lake Coleridge

Grehan Stream