Unison Networks

Unison Networks Limited (Unison) is an electricity distribution and fibre optic network company, based in Hastings, New Zealand.

Unison Networks
IndustryElectricity distribution
PredecessorHawke's Bay Electric Power Board
Founded1924
Headquarters
Hastings
,
New Zealand
Area served
Hawkes Bay, Rotorua, Taupo
Key people
Kevin Atkinson (Chair)
Ken Sutherland (CEO)
Revenue$210m[1]
$27m[1]
Total assets$721m[1]
Total equity$343m[1]
ParentHawke's Bay Power Consumers' Trust
Websitewww.unison.co.nz

Unison owns and manages the electricity lines network and the fibre optic network in the Hawke's Bay, Rotorua and Taupo regions. The service area covers 12,000 km2.[2] The Unison group also provides electrical, fibre, civil, and vegetation contracting services; manufactures electrical products; and operates an insurance company.[1]

Ownership

The company is 100% owned by the Hawke's Bay Power Consumers' Trust on behalf of electricity consumers in the Hawke's Bay area. The Trust is made up of five elected Trustees and operates under a Trust Deed.[3]

Distribution network

The Unison subtransmission and distribution network is supplied from the national grid via Transpower substations. Seven Transpower grid exit points (GXPs) supply the Unison network: Redclyffe, Fernhill, and Whakatu for Napier-Hastings; Wairakei for Taupo; and Rotorua, Owhata, and Takurenga for Rotorua.

Network statistics
Unison Networks Limited network statistics as of 31 March 2015[4]
ParameterValue
Napier-HastingsRotorua & TaupoTotal
Total system length5,503 km3,500 km9,002 km
33 kV288 km198 km487 km
11 kV2,471 km2,049 km4,520 km
Single wire earth return (SWER)2 km124 km126 km
Low voltage (230/400 V)2,741 km1,128 km3,845 km
Street lighting996 km674 km1,670 km
Customer connections63,15747,888111,045
System Maximum Demand192 MW162 MW354 MW
Total Energy Delivered983 GWh693 GWh1,676 GWh

Network performance

Unison reported the normalised performance of the network for the 2014/15 year as follows:[1]

ParameterValue
Napier-HastingsRotorua & TaupoTotal
System Average Interruption Duration Index (SAIDI)89.6 mins149.2 mins115.3 mins
System Average Interruption Frequency Index (SAIFI)1.742.291.97

History

Early in the twentieth century, electricity generation and distribution was managed by local councils or municipal departments. An electricity network was established in Hastings in 1912, with a power house in Eastbourne Street. Following changes to national legislation, the Hawke's Bay Electric Power Board was formed in 1924.[5]

Subsidiaries
  • Unison Contracting Services Limited
  • Unison Energy Limited
  • Unison Fibre Limited
  • Unison Insurance Limited
  • ETEL Limited

See also

References
  1. "Annual Report 2015". Unison. 4 November 2015.
  2. "Asset Management Plan 2015" (PDF). Unison. 30 March 2015.
  3. "Hawke's Bay Power Consumers' Trust". Unison. Retrieved 21 January 2016.
  4. "EDB Information Disclosure - Unison Networks Limited - year ending 31 March 2016" (PDF). 31 August 2016. Retrieved 19 August 2017.
  5. "Unison's History". Unison.
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