Upper South Island Grid Upgrade Stage 1

Transpower has established that the 220 kV transmission grid supplying the Islington substation will not be able to supply the expected upper South Island peak demand from 2016.

Transpower is therefore planning to upgrade the Upper South Island grid to increase the transmission capacity of the 220 kV circuits connected to Islington Substation.

On 29 June 2012, Transpower submitted to the Commission a major capex proposal for stage one of the South Island Reliability Upgrade. The proposal includes the following work packages:

  1. A 220 kV bus coupler at Islington that will improve the reliability of electricity transmission to the Upper South Island.
  2. Install load monitoring equipment in Transpower substations located in the Upper South Island.
  3. Preliminary works for stage two of the Upper South Island reliability upgrade.

Transpower's application and supporting documents are available below.

The Commission made its decision to approve the major investment proposal on 11 February 2013. Our decision and reasons paper and other documentation are available below.

In late 2014 Transpower applied for an amendment to the project outputs and major capex allowance for the Upper South Island grid reliability stage 1 project. We approved Transpower’s application for an amendment in February 2015 – read more at Amending the allowance and outputs for the Upper South Island Stage 1 project.

Documents

Decision and Reasons Paper Upper South Island Reliability Stage 1 Major Capex Proposal

14/02/2013 (2 documents)

Commerce Commission letter to Transpower USI Stage 1 MCP approval PDF (381 KB)
Published on 14 February 2013
Decision and reasons paper for USI Grid upgrade Reliability Stage 1 MCP PDF (1.1 MB)
Published on 14 February 2013

Cross submissions on Transpower's Upper South Island Reliability Stage 1 Major Capex Proposal

13/02/2013 (2 documents)

Genesis Energy cross submission on Transpowers USI Reliability Stage 1 MCP 5 February 2013 PDF (44 KB)
Published on 13 February 2013
Vector cross submission on Transpowers USI Reliability Stage 1 MCP 5 February 2013 PDF (164 KB)
Published on 14 February 2013

Draft decisions and reasons paper USI Stage 1 MCP

(1 documents)

Draft decision and reasons paper Upper South Island Grid Upgrade stage 1 MCP 13 December 2012 PDF (1.1 MB)
Published on 13 December 2012