Transpower major capital proposal

Transpower uses a major capital proposal to seek regulatory approval for a major capital investment in the national grid or the high-voltage electricity transmission network.

The Capital Expenditure Input Methodology sets out the requirements Transpower follows when preparing major capital proposals and the criteria the Commission uses to review and approve a major capital proposal.

Grid upgrade proposals

A grid upgrade proposal (GUP) is a proposal for major capital investment in the national grid that Transpower prepared under the Electricity Governance Rules and submitted to the Commerce Commission or the former Electricity Commission for approval. After 31 January 2012, Transpower submits major capital proposals instead of the grid upgrade proposals.

Individual major capital proposals

Potential capital proposals under development

 Name Estimated cost ($millions) Indicative application  date Indicative decision date
Waikato and Upper North Island voltage management TBA Mid 2018 2018
       

Major capex proposals being reviewed by the Commission

 Name

 Proposed cost ($millions)

 Application date  Indicative decision date  
       
       

Decisions on major capex proposals

Name Maximum approved cost ($millions)
Application date Decision date
HVDC – increase in interim grid expenditure $8 14-Jun-11 25-Aug-11  
Kaitaia Capacitor Bank Project Overspend $2.848 29-Mar-11 21-Jun-11
Kawerau generation export enhancement investment proposal $9.5 23-Dec-11 18-Apr-12
Upper South Island Grid reliability stage 1 $4.99 29-Jun-12 11-Feb-13
Otahuhu Substation Diversity project MCA Amendment Application $7.1 27-Sept-12 12-Apr-13
Amending Transpower's demand response initiatives in the upper North Island - 13-Aug-13 28-Nov-13 
Amending the outputs for Transpower's Bombay 110 kV bus security project - 30-Sept-13 01-Nov-13 
Bunnythorpe Haywards A and B lines conductor replacement investment proposal $161 08-Nov-13 09-May-14
Amendment to Upper South Island Grid reliability stage 1 $7.99 18-Nov-14 26-Feb-15
Amending the allowance and outputs for the North Island Grid Upgrade Project $876.3  30-Sept-13  6-Aug-15

Approved grid upgrade plans are available in the online archive.

Historic grid upgrade plans assessed by the Electricity Commission

Grid upgrade plans assessed by the Electricity Commission prior to 1 November 2010 are held on the Electricity Authority website.

Waikato and Upper North Island voltage management

The closure of Southdown and Otahuhu Power stations in Auckland and the proposed closure of the Huntly Power Station in Waikato are expected to cause voltage management issues in the Auckland and Waitako regions as peak electricity demand increases.

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Bunnythorpe-Haywards A and B lines conductor replacement investment proposal

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Timaru Substation Development

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Otahuhu Substation Diversity project MCA Amendment application

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Upper South Island Grid Upgrade Stage 1

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Amending the allowance and outputs for the North Island Grid Upgrade Project

On 30 September 2013 Transpower submitted an application to the Commission to amend the allowance for the North Island Grid Upgrade project. On 6 August 2015 we published our final decision.

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Amending the outputs of Transpower’s demand response initiatives in the upper North Island

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Amending the outputs for Transpower's Bombay 110 kV bus security project

On 30 September 2013, Transpower submitted to the Commission a proposal to amend the outputs of the Bombay 110 kV bus security project.

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Amending the allowance and outputs for the Upper South Island Stage 1 project

On the 27 August 2014 Transpower submitted a proposal to the Commission to amend the allowance for the Upper South Island Grid Upgrade Stage 1 project.

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