Tekapo A Power Station

Last updated

Tekapo A Power Station
Power plant Tekapo A.jpg
Tekapo A Power Plant pictured in 2016, with the surge tank visible above it
CountryNew Zealand
Location Canterbury
Coordinates 44°00′50″S170°27′38″E / 44.01382°S 170.46045°E / -44.01382; 170.46045
Purpose Power
StatusOperational
Construction began1938 (1938)
Owner(s) Genesis Energy Limited [1]
Power Station
Commission date1951
Type Conventional
Turbines 1
Installed capacity 30 MW (40,000 hp) [1]
1981 net generation 160 GW·h

The Tekapo A Power Station is a hydroelectric facility at the southern end of Lake Tekapo in the Mackenzie Basin, Canterbury, New Zealand. It is a short distance south of the township. The power station is owned and operated by Genesis Energy Limited.

Contents

History

The station was the second to be built as part of the Upper Waitaki hydroelectric scheme. [2] Construction on the Tekapo A Power Station began in 1938. Construction was interrupted by World War II due to shortages of labour and material. The original turbine, generator and transformer were manufactured by English Electric. [3] The facility finally opened in 1951. [1]

Lake George Scott was created to divert water from the Tekapo River to the Tekapo B Power Station Tekapo River & Lake George Scott - Overflow Spillway.jpg
Lake George Scott was created to divert water from the Tekapo River to the Tekapo B Power Station

The facility was expanded in 1970 with the addition of a 25.5 kilometres (15.8 mi) canal to take outflow water to Lake Pukaki and the Tekapo B Power Station. [1] Just to the east is the artificially-created Lake George Scott, which is part of the diversion of additional lakewater from the Tekapo River into the canal. Due to the diversion into the canal, the river is usually dry south of the power plant. When the lake level is high, gates can be opened to dump water back into the original bed of the river.

The penstock tunnel was dug through glacial moraine, which required the use of a "shield" held up by hydraulic supports, with reinforced concrete blocks inserted behind the tunnel-face to form the tunnel lining. [3]

In 1986, three of the seven turbine blades broke off, destroying the turbine. A new turbine, manufactured in Finland, was installed to replace it. [2]

The plant was owned by Meridian Energy until 2011, when it was purchased by Genesis Energy Limited under the direction of the New Zealand Government. [4]

In 2021 earthquake engineering work was completed at the facility, including the installation of a new 50-tonne intake gate. [5] The work cost NZ$ 25,600,000. [6]

Technical details

Water is taken from Lake Tekapo using an inlet structure at the southern end of the lake. The water then flows 1.4 kilometres (0.87 mi) south through a tunnel underneath the township to the power station. The tunnel has a diameter of 6.1 metres (20 ft). The water enters a surge tank, that is 18.3 metres (60 ft) high and has a diameter of 48.8 metres (160 ft). The surge tank is 30.5 metres (100 ft) above the powerhouse, which creates the effective head of the station. [3]

The station features a single generator unit with an output of 30 megawatts (40,000 hp). It uses a vertical Kaplan turbine. [2] Generated power is fed into the grid via an eastward 110 kilovolt overhead line to Timaru, managed by Transpower New Zealand. An additional 33kV overhead line managed by Alpine Energy goes westward to feed Mount Cook Village. The Tekapo A station can be isolated from the rest of the grid, creating a power "island" that contains only Tekapo, Fairlie, Albury and Mt Cook areas. [1]

See also

Related Research Articles

<span class="mw-page-title-main">Benmore Dam</span> Dam in Canterbury Region, New Zealand

Benmore Dam is the largest dam within the Waitaki power scheme, located in the Canterbury Region of New Zealand's South Island. There are eight other power stations in the Waitaki Power Scheme.

Meridian Energy Limited is a New Zealand electricity generator and retailer. The company generates the largest proportion of New Zealand's electricity, generating 35 percent of the country's electricity in the year ending December 2014, and is the fourth largest retailer, with 14 percent of market share in terms of customers as of December 2015.

<span class="mw-page-title-main">Manapouri Power Station</span> Dam in Fiordland National Park, Southland

Manapōuri Power Station is an underground hydroelectric power station on the western arm of Lake Manapouri in Fiordland National Park, in the South Island of New Zealand. At 854 MW installed capacity, it is the largest hydroelectric power station in New Zealand, and the second largest power station in New Zealand. The station is noted for the controversy and environmental protests by the Save Manapouri Campaign against raising the level of Lake Manapouri to increase the station's hydraulic head, which galvanised New Zealanders and was one of the foundations of the New Zealand environmental movement.

<span class="mw-page-title-main">Waitaki River</span> River in the South Island of New Zealand

The Waitaki River is a large braided river in the South Island of New Zealand. It drains the Mackenzie Basin and runs 209 kilometres (130 mi) south-east to enter the Pacific Ocean between Timaru and Oamaru on the east coast. It starts at the confluence of the Ōhau and Tekapo rivers, now at the head of the artificial Lake Benmore, these rivers being fed by three large glacial lakes, Pukaki, Tekapo, and Ōhau at the base of the Southern Alps. The Waitaki flows through Lake Benmore, Lake Aviemore and Lake Waitaki, these lakes being contained by hydroelectric dams, Benmore Dam, Aviemore Dam and Waitaki Dam. The Waitaki has several tributaries, notably the Ahuriri River and the Hakataramea River. It passes Kurow and Glenavy before entering the Pacific Ocean. The River lends its name the Waitaki District on the south side of the river bank.

<span class="mw-page-title-main">Twizel</span> Town in the South Island of New Zealand

Twizel is the largest town in the Mackenzie District, in the Canterbury Region of the South Island of New Zealand. The town was founded in 1968 to house construction workers on the Upper Waitaki Hydroelectric Scheme. Today, Twizel is a service and tourist town for visitors to the area. It has a resident population of 1,890 ; during the summer, holidaymakers nearly triple the town's population.

<span class="mw-page-title-main">Lake Benmore</span> Lake in the South Island of New Zealand

Lake Benmore is New Zealand's largest artificial lake. Located in the South Island of New Zealand and part of the Waitaki River, it was created in the 1960s by construction of Benmore Dam.

<span class="mw-page-title-main">Lake Pukaki</span> Lake in Canterbury Region, New Zealand

Lake Pukaki is the largest of three roughly parallel alpine lakes running north–south along the northern edge of the Mackenzie Basin on New Zealand's South Island. The others are Lakes Tekapo and Ōhau. All three lakes were formed when the terminal moraines of receding glaciers blocked their respective valleys, forming moraine-dammed lakes. The Alps2Ocean mountain bike trail follows the edge of Lake Pukaki for part of its length.

<span class="mw-page-title-main">Lake Tekapo</span> Lake in the South Island of New Zealand

Lake Tekapo is the second-largest of three roughly parallel lakes running north–south along the northern edge of the Mackenzie Basin in the South Island of New Zealand. It covers an area of 83 km2 (32 sq mi) and is at an altitude of 710 m (2,330 ft) above sea level.

<span class="mw-page-title-main">Pukaki River</span> River in New Zealand

The Pukaki River flows through the Mackenzie Basin, Canterbury, in New Zealand's South Island.

Project Aqua was a hydroelectric scheme proposed for the lower Waitaki River in New Zealand. Although the scheme had considerable support from some locals, it met with opposition from many other groups, and Meridian Energy decided in March 2004 not to go ahead with the project.

<span class="mw-page-title-main">Aviemore Dam</span> Dam in Canterbury/Otago, New Zealand

The Aviemore Dam is a dam on the Waitaki River in New Zealand. The dam is a composite dam, with an embankment section, and a concrete section. Built in the 1960s it impounds Lake Aviemore.

<span class="mw-page-title-main">Hydroelectric power in New Zealand</span>

Hydroelectric power in New Zealand has been a part of the country's energy system for over 100 years and continues to provide more than half of the country's electricity needs. Hydroelectricity is the primary source of renewable energy in New Zealand. Power is generated the most in the South Island and is used most in the North Island.

<span class="mw-page-title-main">Coleridge Power Station</span> Dam in Canterbury, New Zealand

The Coleridge Power Station is a hydroelectric facility at Lake Coleridge on the Rakaia River in Canterbury, New Zealand. The power station is owned and operated by Manawa Energy.

The North Bank tunnel concept was a hydroelectric scheme being developed by Meridian Energy on the Waitaki River in Canterbury, New Zealand. The $993 million project was expected to produce an additional 1,100 to 1,400 gigawatt-hours per annum, and take up to 260 cubic metres per second (9,200 cu ft/s) of water from Lake Waitaki. The project would have resulted in a 275 gigawatt-hours (990 TJ) per annum reduction in output from the Waitaki hydro station.

<span class="mw-page-title-main">Tongariro Power Scheme</span> New Zealand hydroelectricity scheme

The Tongariro Power Scheme is a 360 MW hydroelectricity scheme in the central North Island of New Zealand. The scheme diverts water from tributaries of the Rangitikei, Whangaehu, Whanganui, and Tongariro rivers. These rivers drain a 2,600-square-kilometre (1,000 sq mi) area including Ruapehu, Ngauruhoe, Tongariro and the western Kaimanawa Ranges. The water diverted from these rivers is sent through canals and tunnels to generate electricity at three hydro power stations, Rangipo (120 MW), Tokaanu (240 MW) and Mangaio (2 MW). The water is then discharged into Lake Taupō where it adds to the water storage in the lake and enables additional electricity generation in the succession of power stations down the Waikato River.

<span class="mw-page-title-main">Maraetai Power Station</span> Dam in near Mangakino, Waikato

Maraetai Power Station is a hydroelectric power station on the Waikato River, in the North Island of New Zealand. It is the fifth of the eight hydroelectric power stations on the Waikato River, and at 360 MW, is the largest hydroelectric station on the Waikato.

The Mangorei Power Station is a hydroelectric power facility near Mangorei in Taranaki in New Zealand which makes use of water from the Waiwhakaiho River and the Mangamahoe Stream catchments.

<span class="mw-page-title-main">Waitaki Dam</span> Dam in South Canterbury, New Zealand

The Waitaki Dam is one of eight hydroelectric power stations which form the Waitaki hydroelectric scheme on the Waitaki River in the Canterbury Region of New Zealand. The dam was the first of three to be built on the Waitaki River and was constructed without earthmoving machinery; over half a million cubic metres of material was excavated, almost entirely by pick-and-shovel. The Waitaki Dam's construction was followed by the development of Aviemore Dam and Benmore Dam, and importantly, every dam built in New Zealand since the Waitaki has benefited from lessons learned during its construction.

References

  1. 1 2 3 4 5 "Tekapo Power Scheme", Genesis NZ, retrieved 12 June 2024
  2. 1 2 3 Discover the Waitaki Hydro Scheme (PDF), Meridian Energy, archived from the original (PDF) on 2 February 2022
  3. 1 2 3 Electricity Division, Ministry of Energy (1981). "Tekapo A Power Station". Wellington: New Zealand Government Printer. Retrieved 12 June 2024.
  4. "Genesis Energy set to acquire Tekapo A and B power stations", Genesis Energy, 13 May 2011, archived from the original on 13 October 2011, retrieved 12 June 2024
  5. Hedley, Mark; Parfitt, Alex (October 2022), "Construction of Tekapo A New Intake Gate and Shaft" (PDF), Concrete NZ Conference 2022, archived from the original (PDF) on 23 June 2024, retrieved 24 June 2024
  6. "$26.5 million earthquake-strengthening work at Tekapo power station completed", Stuff, 22 February 2021, archived from the original on 27 March 2023, retrieved 12 June 2024