Project Progress
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OVERVIEW

Stratford Mountain House (Pembroke Rd) undergrounding

The challenge

To strengthen security of power supply from the edge of the Egmont National Park to the Stratford Mountain House, while maintaining power supply to customers during the project.

This was supported by further influencing factors including:

  • The 4.4km of power line was due for complete rebuild
  • Annual tree trimming to keep vegetation clear of the existing power line was costly and intrusive
  • Winter snow storms exposed the lines to undue risk
  • The Department of Conservation (DOC) was keen to have all overhead lines removed in national parks.
  • The mountain house and mountain club were the two main users of power with Airways NZ, Vodafone, Spark, Team Talk Ltd and Two Degrees all operating key communication equipment at high altitude

The solution

A decision to place the overhead electricity supply underground from the park gates on Pembroke Rd, to the Stratford Mountain House.

  1. Install an underground cable while the overline was still in service, with a short-planned power outage to connect the cable at each end, and convert from an overhead to underground supply.
  2. Removal of the 66 old poles and 4.4km overhead conductor cable was designed to enhance the aesthetics of the park, while strengthening the security of supply.  These were removed once the new underground cable was in operation.

The project’s success was supported by collaboration across Powerco, the Department of Conservation, the Stratford District Council, Ngati Ruanui (the Stratford Mountain House owner), and the Stratford Mountain Club (the Manganui ski field operator).

The benefit

  • An end to unwelcomed power disruptions from trees across lines, snow build up collapsing lines, and windblown debris damaging lines
  • The last of the overhead electricity network in the Egmont National Park was removed – power supply was placed underground resulting in an impressive visual impact

Milestones

Construct new substation building

The first part of the South Waikato Grid Connection project is to replace the building - which doesn’t meet earthquake resilience standards - and upgrade the equipment at the Putaruru substation.

Route for new circuit between Arapuni and Putaruru confirmed

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Planned power cut during this period

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Construction of the circuit and new transformer at Putaruru substation

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2020
2020
June 2020
July 2020

UPDATES

Find out the latest updates about this project

FAQ

We strive to minimise impact in the design and placement of network infrastructure and we’re still planning and consulting on the route for the new circuit. The circuit will be a mix of overhead lines – which you will see, and underground cable – which you won’t see. You’ll also see a new building at our Putaruru substation, replacing the ageing existing building there.

We can never guarantee supply 100% of the time, however, the number and length of outages you experience will be reduced.  

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Gallery

Downloads

2020

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