Power plant Ohau A
| Power plant Ohau A | ||
|---|---|---|
 |
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| location | ||
|
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| Coordinates | 44 ° 15 '52 " S , 170 ° 1' 57" E | |
| country |
 New Zealand
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| place | Canterbury region | |
| Waters | Lake Ohau , Lake Pukaki | |
| power plant | ||
| owner | Meridian Energy Limited | |
| operator | Meridian Energy | |
| construction time | 1971 to 1979 | |
| Start of operation | 1979 | |
| technology | ||
| Bottleneck performance | 264 megawatts | |
| Average height of fall |
59 m | |
| Standard work capacity | 1,140 million kWh / year | |
| Turbines | Francis turbines 4 × 66 | |
| Others | ||
The power plant Ohau A ( English Ohau A power station ) is a hydroelectric plant on the South Island of New Zealand in the region Canterbury . The municipality of Twizel is about three kilometers east of the power plant. The Ohau B power plant is located approximately six kilometers southeast of Ohau A.
Construction work began in 1971. The power plant went into operation in 1979. It is owned and operated by Meridian Energy Limited .
Lakes and canals
The Ohau A power plant uses the water from Lake Ohau and Lake Pukaki to generate electricity. From Lake Pukaki, an approximately twelve-kilometer-long canal leads in a south-westerly direction to the power station. From Lake Ohau a canal about eight kilometers long goes off in an easterly direction, which joins the Pukaki Canal about one kilometer from the power station.
The water from the canal is then fed through four penstocks to the power plant's machine house. The height of fall is 59 m. After the water has passed the power plant, it flows into Lake Ruataniwha .
Lake Ohau
The normal storage target of the lake is 520.25 m (maximum 524.15 m at high water), the minimum at 519.45 m. At the lake there is a weir about 1 km south of the Ohau Canal . The weir can drain water into the otherwise dry Ohau River .
Lake Pukaki
The normal storage target of the lake is 532.5 m (maximum 534.1 m at high tide), the minimum at 518 m. In the 1940s the water level of the lake was raised by 9 m by a dam. In the 1970s, the dam was expanded and the water level of the lake was raised by another 37 m.
The flood relief is located on the lake, approx. 1 km east of the Pukaki Canal. A maximum of 3400 m³ / s can be discharged via the flood discharge, which is then diverted into the otherwise dry Pukaki River . The design flood is 2000 m³ / s; the probability of this event occurring has been determined to be once every 1,000 years.
power plant
The Ohau A power plant has an installed capacity of 264 MW . The average annual generation is 1.142 (or 1.150) billion kWh. The 4 Francis turbines have a maximum output of 66 MW each. The generators have a nominal voltage of 11 (or 13.2) kV .
See also
Web links
Individual evidence
- ↑ a b Ōhau A hydro station. Meridian Energy, accessed April 24, 2019 .
- ↑ a b Lake levels and snow storage. Meridian Energy, accessed June 10, 2015 .
- ↑ a b c d Waitaki Power Stations - Appendix A - Extracts of Waitaki Operating Rules. (PDF 185 kB) Ministry of Business, Innovation & Employment , November 9, 1990, pp. 5–8 , archived from the original on February 23, 2013 ; accessed on April 24, 2019 (English, original website no longer available).
- ↑ a b Discover Waitaki. (PDF 986 kB) Meridian Energy, archived from the original on March 4, 2016 ; accessed on June 14, 2015 (English, original website no longer available).
- ^ Ohau-A Hydroelectric Power Plant New Zealand. Global Energy Observatory, accessed June 14, 2015 .