|Predecessor||Taranaki Energy Limited|
|Headquarters||New Plymouth, New Zealand|
|39,000 sq km|
Natural gas distribution
|Owners||Queensland Investment Corporation (58%)
AMP Limited (42%)
Number of employees
|330 full-time equivalent|
Powerco is the second-largest gas and largest electricity distributor in New Zealand. It is one of only two companies to distribute both electricity and natural gas through their network (the other being Vector Limited). Its network delivers electricity and gas to households around the North Island from the national electricity transmission network Transpower and the natural gas transmission system owned and operated by Vector Limited.
Powerco arose from the energy reforms in New Zealand in the 1990s. It can trace its history back to a number of local power boards and gas companies that operated throughout the North Island. The company is 58% owned by Queensland Investment Corporation and 42% owned by AMP Limited.
The New Zealand electricity reforms of the 1980s split the electricity industry broadly into four sections - generators, transmitters, distributors and retailers. Six main generator businesses (Contact Energy, Genesis Energy, Mercury Energy, Meridian Energy, Trustpower and Nova Energy) generate electricity and supply it to New Zealand's national grid, operated by Transpower. Transpower transmits high-voltage electricity to grid exit points (or substations) around New Zealand for transmission to households and businesses. The local distribution network (mostly consisting of underground wires and/or overhead wires) that transmit electricity to end-users like households and businesses are owned and operated by local distribution companies, mostly regionally based.
Powerco is a distributor whose business is completely separate from generation, national transmission and retail (selling delivered electricity to end-users). It operates a 30,000 km local electricity distribution network supplying 320,000 households, industries and businesses from Transpower's national grid and a 6,000 km natural gas distribution network supplying 102,000 households, industries and businesses from Vector's transmission system.
Its electricity network currently supplies the following regions:
- Tauranga and the Western Bay of Plenty District
- Thames-Coromandel, Hauraki, Matamata-Piako and South Waikato Districts
- Taranaki Region
- Wanganui and Rangitikei Districts
- Palmerston North City and Manawatu District
- Southern Tararua District (south of and including Mangatainoka)
Powerco's natural gas distribution network covers:
- Palmerston North
- Horowhenua District
- Hawke's Bay Region
- Hutt Valley
- Wellington City
- April 1993 - New Plymouth Energy (the electricity division of the New Plymouth District Council) merges with Taranaki Electricity (former Taranaki Electric Power Board) to become Taranaki Energy Limited.
- 1994 - Taranaki Energy acquired the Hawera Gas Company.
- October 1995 - Taranaki Energy Limited merges with Wanganui-based Powerco (the former Wanganui Electric Power Board) to become PowerCo Limited.
- September 1997 - Powerco acquires Hawera based Egmont Electricity.
- April 1998 - Government pass Electricity Industry Reform Act. PowerCo decided to become a "network business" (or lines company), and the following changes are made:
- Electricity Retail Business (customer base) sold to Genesis Power
- Gas Retail Business sold to Natural Gas Corporation
- Natural Gas Corporation's Taranaki gas networks sold to Powerco
- Powerco's five hydro power stations sold to TrustPower
- Powerco purchases Wairarapa Electricity's network business (formerly part of the Wairarapa Electric Power Board)
- August 2000 - Powerco merged with CentralPower (itself formed by the merger of CentralPower (for former Manawatu-Oroua Power Board) and ElectroPower, the former electricity division of Palmerston North City Council).
- June 2001 - Powerco purchases the Hutt Valley and Porirua gas networks from AGL.
- February 2002 - Powerco purchases the Electricity Assets of United Networks Limited in Tauranga, Eastern and Southern Waikato, Thames and Coromandel, plus gas networks in Wellington, Horowhenua, Manawatu and Hawke’s Bay.
- 2004 - Powerco purchased Siemens Energy Services' Tauranga based contracting division
- November 2005 - Powerco sold its New Zealand field services contracting business to Tenix Alliance
- 2008 - Divestment of Powerco Australia Group (Tasmania gas distribution) to Babcock & Brown Infrastructure
Electricity network statistics
|Total network||Eastern network
(Tauranga, Coromandel and South Waikato)
(Taranaki, Whanganui, Manawatu and Wairarapa)
|Total circuit length||27,833 km||10,384 km||17,449 km|
|66 kV||169 km||169 km||–|
|33 kV||1,484 km||456 km||1,028 km|
|22 kV||122 km||–||122 km|
|6.6/11 kV||16,587 km||5,893 km||10,694 km|
|Single wire earth return (SWER)||86 km||69 km||17 km|
|Low voltage (230/400 V)||9,384 km||3,798 km||5,587 km|
|Street lighting||2,737 km||,1394 km||1,343 km|
|System maximum demand||860 MW||440 MW||412 MW|
|System electricity delivered||4,715 GWh||2,332 GWh||2,383 GWh|
Natural gas network statistics
|Total network||Hawke's Bay, Taranaki & Manawatu||Wellington metro|
|Total pipeline length||5,883 km||3,130 km||2,753 km|
|Intermediate pressure (700–2000 kPa)||277 km||109 km||168 km|
|Medium pressure (7–700 kPa)||5,550 km||3,011 km||2,539 km|
|Low pressure (<7 kPa)||56 km||10 km||45 km|
|System maximum demand||43.01 TJ/day||20.88 TJ/day||22.77 TJ/day|
|System gas delivered||8,525 TJ||4,959 TJ||3,566 TJ|
- "Our Business". Powerco. 19 August 2011. Retrieved 20 August 2011.
- "Our People". Powerco. 14 July 2015.
- "Our Business: New Zealand's Electricity Market". Powerco. 14 July 2015.
- "Our Business: Our Networks". Powerco. 14 July 2015.
- "EDB Information Disclosure - Powerco Limited - year ending 31 March 2015" (PDF). 31 August 2015. Retrieved 4 April 2016.
- "GDB Information Disclosure - Powerco Limited - year ending 31 March 2016" (PDF). 31 August 2016. Retrieved 21 February 2017.