Knowledge (XXG)

Aniwhenua Power Station

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study determined that a power station on the Rangitaiki River at its confluence with the Pokairoa Stream, midway between Murupara and Whakatane. The scheme was technically feasible and financially viable. The main identified environmental impacts were significantly reduced flows over the Aniwhenua Falls, inundation of productive farm land and the displacement of one family, as well as the long term accumulation of sediment in the lake that the project would create. The issue of the reduced flow was managed by the imposing of a minimum residual flow over the falls.
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regarding local hydro development. As a result, in 1977 the government announced that they would subsidize local power station schemes of less than 50 MW by providing grants to cover the investigation and design work, cheap loans to finance construction as well as loans from the NZED to cover operating losses in the early years of approved schemes. The government established the Committee on Local Authority Hydro Development (CLAHD) to evaluate applications for grants or loans from supply authorities.
499:. Smaller dams also divert water from the Pokairoa into Lake Aniwhenua. The lake is 4.5 km long by approximately 500 m wide and is 255 ha in area. The maximum depth of the lake is 10 metres at the dam but it is typically less than three metres deep in other locations. The dam contains two wheeled penstock intake closure gates, two radial spillway gates which can discharge 1,270 cumecs of water. As well there are three additional flap type flood gates designed to handle higher flood conditions. 53: 487: 548:
The headwaters of the Rangitaki River collect lightweight pumice sands and partly greywacke gravels which are deposited in the lake. During its first 15 years of operation the lake accumulated approximately 1.5 million m3 of sediment. Loss of storage has been managed by constructing training banks to
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Looking to raise capital to invest in other energy projects in the North Island Nova agreed to sell Aniwhenua in November 2015 to Southern Generation Partnership (a partnership between Pioneer Generation Investments and Roaring Forties) for approximately NZ$ 100 million with ownership transferring in
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After a serious leak developed in the dam during Nova's ownership. Following investigations and development of a solution by consultants Tonkin + Taylor, the contracting firm of Waiotahi Contractors commenced in February 2006 the 58 day repair of the leak which took 58 day at a cost NZ$ 2.78 million.
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The 1973–74 oil shock, nation-wide electricity shortages during the winters of 1973 and 1974, a renewed policy emphasis on regional development by central government, and increased uncertainty as to future wholesale electricity price trends lead to the New Zealand government to re-evaluate its policy
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Via two 11/33/110 kV tertiary wound step-up transformers Aniwhenua is the primary supplier of electricity to Horizon Network's distribution network in the Galatea and Kaingaroa regions via a single 33 kV feeder that runs to Snake Hill and then splits into two feeders to supply Galatea with a further
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In the late 19th century and early 20th century, numerous small local power generation stations were built by both private and local authorities. From the 1920s onward as the state electricity system expanded and the national grid was developed, development of small local power stations declined as
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For transmission pricing purposes a Prudent Discount Agreement exists for Aniwhenua that makes it part of the Edgecumbe GXP. Aniwhenua is operated to maximise injection into the Horizon network. If there is any generation in excess of local load, this is exported to the national grid. As a result,
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Operation of the power station is covered by the requirements of five resource consents, with the principal consent expiring in September 2026. The lake level operates between a normal operating range of 146.1 to 146.8 metre RL (relative to the Moturiki datum) with the emergency spillway having a
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Compensation water of a 2.5 cumecs is also released from the dam to preserve the original river channel and maintain flow over the falls. A small turbine coupled to a 100 kW generator is driven by the compensation flow and supplies power to the local distribution network via Horizon Energy's
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The Energy Companies Act was enacted in 1992, and amended later that year. This act required the corporatisation of the electricity and gas undertakings of electric power boards and municipalities with the aim of ensuring a commercial and efficient approach to electricity distribution and supply.
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Taking up this opportunity the Bay of Plenty Electric Power Board which had begun operations in 1928 and engaged consultants to investigate a local hydro scheme in mid-1973. Preparation of a feasibility report was authorised in December 1973, with the report being completed in September 1974. The
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From the dam a 2.2 km long concrete-lined canal conveys water to the Pahekeheke Headpond, which was created by damming the Pahekeheke Stream. From the headpond two penstocks transport the water down to a powerhouse containing two Escher Wyss vertical Francis turbines which are each directly
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Aniwhenua began generating on 3 October 1980. The 1982 annual report for the board showed that the total cost of the station to 31 March 1982 was $ 27,767,203 of which $ 24,628,809 was financed by government loan. The book value of the scheme as at 31 March 1992 was $ 21,109,000. By the 1985/86
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In July 1998 the New Zealand Government passed the Electricity Industry Reform Act which was intended to change the structure of the electricity industry to encourage competition. This Act required the operational separation of distribution and generation business activities by 1 July 1999 and
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As a result, the power board was forced in August 1994 to vest all of its assets including Aniwhenua and associated water rights to the Bay of Plenty Electricity Limited. Bay of Plenty Electricity subsequently became the first electricity company to be listed on the New Zealand stock exchange.
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coupled to an ASEA 11 kV 12.5 MW synchronous generator. The station produces on average 127 GWh per annum. The output from the generating units is discharged back to the river just below the falls. The generator size was based on the desire to meet the power board's load factor of 65%.
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financial year, the scheme was breaking even financially and was able to trade its way into long-run profit without any write-offs of debt. Over the period from 1989 to 1992 as its trading activities were making a loss the profits from Aniwhenua kept the power board in the black.
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The civil works which commenced by the end of 1977 constructed by Downer and Company which involved the excavation of one million tons of material and the placing of 270,000 cubic metres of fill, 20,000 cubic metres of concrete and 884 tonnes of reinforcing steel.
382:. Water is drawn from behind a dam above the Aniwhenua Falls and diverted through a canal and a headpond to the power station before being discharged back into the river. The power station is named after the falls which are adjacent to the power station. 494:
A 200-metre-long, 10-metre-high dam located upstream of the eight-metre-high Aniwhenua Falls impounds the Rangitaiki River and Pokairoa Stream at their confluence at Black Road, Galatea, approximately 65 km upstream from the river mouth to create
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level of 148.6 metre RL. The power station operates as a run of river scheme as the lake is small in terms of river flow. Low overnight demand allows refilling of the lake and drawdown to provide increased generation over the daytime peaks. and
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single feeder from Galatea to Kaingaroa. Any surplus above this local demand is exported via a 110 kV circuit to the Matahina Power Station where the two power stations combine to export electricity to the national grid via two 110 kV circuits to
1450: 457:. On 1 April 1999, the remaining distribution assets were transferred to a new company, Horizon Energy Distribution Limited (which operates these assets under the name of Horizon Networks). 961: 863: 1445: 415:
Following the obtaining of water rights, government consent and other necessary approval, construction and equipment supply contracts were let in the second half of 1977.
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At the beginning of December 2018 Pioneer Energy took over the services agreement with the Southern Generation Partnership to operate and maintain the power station.
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The power station typically generates at least 8 MW, as below this value it will be necessary to spill water which will impact on the river downstream.
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As a result, in 1998 Bay of Plenty Electricity sold its retail and generation business, together with its name to Nova Energy, which was owned by the
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There is an ongoing programme to transfer migrating elvers and eels both upstream and downstream from the lake, to maintain eel stocks.
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In addition, it has been necessary to undertake limited dredging operations to remove sedimentation with 30,000 m3 removed in 2002.
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Compensation water is also released from the headpond through a draw off pipe into the original course of the Pahekeheke Stream.
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encourage the sediment to settle in the deeper areas of the lake as well as lowering of the lake and flushing during floods.
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Duder, J. N. (11–14 September 1996). "Reservoir Sedimentation- Some Aspects of Reservoir Asset Management".
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April 2016. The Roaring Forties is a partnership between The Power Company and Electricity Invercargill.
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Transactions of the Institution of Professional Engineers New Zealand: Civil Engineering Section
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Pickens, G.A.; Leyland, B. W.; Duder, J. N. (March 1984). "The Aniwhenua Hydroelectric Scheme".
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Ecological impacts of water net (Hydrodictyon reticulatum) in Lake Aniwhenua, New Zealand
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The Reservoir as an Asset: Proceedings of the Ninth Conference of the British Dam Society
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People, Power and Power Stations: Electric Power Generation in New Zealand 1880 – 1990
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the centralisation of electricity supply under state control increased.
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Waitangi Tribunal Report WAI 212: Te Ika Whenua – Energy Assets Report
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Lakes in catchment (upstream to downstream by location or tributary)
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Connecting the Country: New Zealand's National Grid 1886 - 2007
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Hydro-Electric Schemes Compliance Report June 2010 – June 2013
864:"Report on Hydroelectric Dams in New Zealand and Fish Passage" 697:. Ministry of Business, Innovation and Employment. August 2015 897:
Compliance Report Hydro Electric Schemes in the Bay of Plenty
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Trapping the adult eel migration at Aniwhenua Power Station
967:. Rangitāiki River Scheme Review Panel. 18 September 2017 990:. London: Thomas Tetford Publishing. pp. 242–243. 600:, Wellington: Brooker $ Friend, 1996, pp. 16–21, 869:. LMK Consulting Ltd. 10 October 2014. Archived from 1451:
Buildings and structures in the Bay of Plenty Region
914:"Horizon Networks Asset Management Plan 2018 – 2028" 1343: 1312: 1281: 1251: 1200: 1164: 333: 323: 313: 303: 293: 285: 277: 240: 232: 224: 216: 208: 200: 195: 185: 180: 172: 164: 156: 148: 140: 132: 124: 86: 76: 68: 34: 1065:. Wellington: Steele Roberts. pp. 376 pages. 642:. London: Taylor & Francis. pp. 201–202. 60:Location of Aniwhenua Power Station in New Zealand 767:"Bay of Plenty projects up for national awards" 450:separation of the ownership by 1 January 2004. 52: 1201:Towns and settlements (upstream to downstream) 692:"Chronology of New Zealand Electricity Reform" 1252:Major tributaries (upstream to downstream by 1123: 810:Mack, Ben; McCarthy, Phil (3 December 2015). 8: 490:Lake Aniwhenua, the lake created by the dam. 1446:Hydroelectric power stations in New Zealand 530:the power station is effectively embedded. 506:The power station has a head of 38 metres. 470:Purchase by Southern Generation Partnership 1130: 1116: 1108: 908: 906: 31: 633: 631: 629: 627: 625: 623: 407:The estimated cost was NZ$ 12.5 million. 719:. New Zealand Government. 29 August 1994 640:Small Hydroelectric Engineering Practice 587: 585: 583: 581: 579: 577: 1313:Other features (upstream to downstream) 791:. Bay of Plenty Times. 11 November 2017 667:. Auckland: Downer NZ Ltd. p. 96. 663:Wolfe, Richard; Barnett, Steve (2014). 573: 858: 856: 854: 686: 684: 738: 736: 734: 7: 789:"Accolades flow for daring dam work" 562:Hydroelectric power in New Zealand 25: 51: 44: 1441:Hydroelectricity in New Zealand 168:Southern Generation Partnership 938:Jonker, Fraser (3 July 2018). 1: 1320:North Island Volcanic Plateau 1015:Martin, John E., ed. (1991). 765:O'Leary, Tom (25 July 2017). 233:Maximum water depth 895:Bruere, Andy (August 2003), 899:, Environment Bay of Plenty 329:25 MW (34,000 hp) 1472: 1345:Longest New Zealand rivers 339:127 GWh (460 TJ) 1145: 744:"Aniwhenua Hydro Station" 521:'s Edgecumbe Substation. 343: 39: 919:. Horizon Networks. 2014 262:38.293694°S 176.792361°E 108:38.308417°S 176.791028°E 1087:Aniwhenua Hydro Station 942:. Electricity Authority 638:Leyland, Bryan (2014). 445:Purchase by Nova Energy 360:Aniwhenua power station 350:Aniwhenua Hydro Station 325:Installed capacity 141:Construction began 35:Aniwhenua Power Station 1061:Reilly, Helen (2008). 839:. Pioneer Energy. 2017 746:. Pioneer Energy. 2019 491: 380:Matahina Power Station 335:Annual generation 267:-38.293694; 176.792361 157:Construction cost 113:-38.308417; 176.791028 769:. Bay of Plenty Times 489: 1456:Bay of Plenty Region 1396:Waiau Toa / Clarence 1177:Bay of Plenty region 1165:Administrative areas 834:"2017 Annual Report" 286:Commission date 29:Dam in Bay of Plenty 1182:Rangitikei District 364:hydroelectric power 258: /  228:Approximately 500 m 217:Maximum length 104: /  1192:Whakatāne District 1172:Hawke's Bay region 876:on 26 January 2018 492: 225:Maximum width 1428: 1427: 1072:978-1-877448-40-9 674:978-0-473-28950-8 649:978-1-138-00098-8 356: 355: 209:Surface area 181:Dam and spillways 149:Opening date 16:(Redirected from 1463: 1360:Clutha / Mata-Au 1325:Kaingaroa Forest 1139:Rangitaiki River 1132: 1125: 1118: 1109: 1076: 1057: 1030: 1002: 1001: 983: 977: 976: 974: 972: 966: 958: 952: 951: 949: 947: 935: 929: 928: 926: 924: 918: 910: 901: 900: 892: 886: 885: 883: 881: 875: 868: 860: 849: 848: 846: 844: 838: 830: 824: 823: 821: 819: 807: 801: 800: 798: 796: 785: 779: 778: 776: 774: 762: 756: 755: 753: 751: 740: 729: 728: 726: 724: 713: 707: 706: 704: 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Index

Aniwhenua Dam
Aniwhenua Power Station is located in New Zealand
Bay of Plenty
38°18′30.3″S 176°47′27.7″E / 38.308417°S 176.791028°E / -38.308417; 176.791028
Rangitaiki River
38°17′37.3″S 176°47′32.5″E / 38.293694°S 176.792361°E / -38.293694; 176.792361
Type
Hydraulic head
Turbines
Installed capacity
Annual generation
Aniwhenua Hydro Station
hydroelectric power
Bay of Plenty
New Zealand
Rangitaiki River
Matahina Power Station
Todd Corporation

Lake Aniwhenua
Transpower
Hydroelectric power in New Zealand






Waitangi Tribunal Report WAI 212: Te Ika Whenua – Energy Assets Report
ISBN

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