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.

To manage voltages in these regions, Transpower may need to invest in the grid or procure non-transmission solutions from third parties.

On 1 July 2016, Transpower and the Commission agreed to a consultation programme, approval timeframe and approach to considering non-Transpower solutions.

Key processes and timeframes



Long-list consultation

July–August 2016

Issue RFP for non-transmission solution

October 2016

Short list consultation

February–March 2018

MCP submission

June 2018

Commission decision

November 2018

Project timeline

Type Description Indicative date/s
Completed Transpower and Commission agree on consultation programme 01/07/2016
Draft Draft decision due 01/09/2018 - 30/09/2018
Final Final decision due 01/11/2018 - 30/11/2018


These dates are not official and may change. Please see the Terms and Conditions for further limitations.