HYDROELECTRIC DAMS IN NEW ZEALAND AND FISH PASSAGE

Canterbury Region

 

The river was developed in multiple stages. The Waitaki dam was built first, without earthmoving machinery, followed by the development of the Aviemore Dam on Lake Aviemore and Benmore Dam on Lake Benmore. Lake Pukaki was initially dammed at this stage to provide storage and flow control. A small station was also installed on Lake Tekapo, but although it has a small dam to raise the pre-existing lake, water was taken through a 1.6 km (1 mi) tunnel to a powerstation below the level of the lake.

In the 1960s, work was started on the Upper Waitaki project. This project consisted of taking the discharge from the original Tekapo (A) station through a power canal, the Tekapo Canal, to Tekapo B station at the edge of Lake Pukaki. The dam at Pukaki was increased in height. Water from Pukaki is then transferred into a the Pukaki Canal which meets the Ohau Canal from Lake Ohau into Ohau A station and Lake Ruataniwha. The Ohau Canal continues beyond Lake Ruataniwha to Ohau B midway along, before emptying through Ohau C into Lake Benmore.

The stations are:

Power Stations Capacity (MW) Anuual Output (GWh) Year Commissioned
Tekapo A 25 160 1955
Tekapo B 160 800 1977
Ohau A 264 1150 1980
Ohau B 212 970 1984/85
Ohau C 212 910 1984/85

The original Waitaki power stations discharge water back into the Waitaki River which then forms a storage lake for the next station in the chain. The three power stations are:

Power Stations Capacity (MW) Anuual Output (GWh) Year Commissioned
Benmore 540 2200 1965
Aviemore 220 940 1968
Waitaki 105 500 1935

Project Aqua was a proposed scheme of 6 dams on a manmade canal running from the Waitaki Dam to the sea. It was cancelled by Meridian Energy on 29 March 2004.

 

Name: Rakaia River
Consent Holder: Electricity Ashburton Limited (known as Barhill Chertsey Irrigation Scheme)
Consent Duration and Review: 28 January 2035
Fish Passage: Yes
Target: Does not specify

 

Name: Lake Tekapo
Consent Holder: Genesis Power Limited
Consent Duration and Review: 30 April 2025
Fish Passage: No

 

Name: Ohau River
Consent Holder: Meridian Energy Limited
Location: Upper Ohau River, Mackenzie
Consent Duration and Review: 30 April 2025
Fish Passage: Yes
Target: Does not specify

 

Name: Lake Pukaki
Consent Holder: Meridian Energy Limited
Consent Duration and Review: 30 April 2025
Fish Passage: No

 

Name: Lake Benmore Dam
Consent Holder: Meridian Energy Limited
Consent Duration and Review: 30 April 2025
Fish Passage: Yes
Target: Native Fish

 

Name: Lake Waitaki (Aviemore) Dam
Consent Holder: Meridian Energy Limited
Consent Duration and Review: 30 April 2025
Fish Passage: Yes
Target: Native Fish

 

Name: Lake Ohau
Consent Holder: Ohau Snow Holdings Limited
Consent Duration and Review: 31 July 2028
Fish Passage: No

 

Name: Transpower New Zealand Global Consent
(rivers within the Canterbury region)
Consent Holder: Transpower New Zealand Limited
Consent Duration and Review: 26 August 2040
Fish Passage: Yes
Target: Native Fish

 

Name: Lake Coleridge
Consent Holder: Trust Power Limited
Consent Duration and Review: 19 December 2031
Fish Passage: No

 

Name: Grehan Stream
Consent Holder: Christchurch City Council
Consent Duration and Review: 31 July 2028
Fish Passage: No



HYDROELECTRIC DAMS IN NZ & FISH PASSAGE

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

Download full report. (PDF - 1.4MB)

 

 

EEL REPORTS

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