Response to 9 August 2021 Grid Emergency

On 9 Aug 2021 the country faced the largest demand peak in response to one of the coldest nights of the year. As system operator, we called a Grid Emergency when insufficient generation was available to meet demand, leading to some customers being disconnected. A number of reviews of this event are underway including an independent review commissioned by Transpower to help us understand the event and industry’s response on the night, to identify where we need to make changes. As system operator, we have a programme of work underway to address recommendations from each of the reports, which includes industry engagement.

Event reviews 

Date Description Link
12 Oct 2021 Transpower-commissioned review, PBA Consulting Independent Investigation Report [ pdf 2.19 MB ]
12 Oct 2021 Transpower-commissioned review, Thompson Lewis Independent Investigation ­‑ Stakeholder Communications Report [ pdf 178.12 KB ]
24 Sep 2021 Transpower response to immediate assurance review (letter and attachment)



10 Sep 2021 Electricity Authority, Phase 1 Immediate Assurance Review Report

Revision of operational notices

Please see revised draft operational notices (CAN, WRN and GEN) for industry review.

A full explanation of proposed changes and how to provide feedback are contained in the document. Please provide your feedback by 20 November.

Draft notices document for industry comment.pdf [ pdf 504.71 KB ]


Industry briefings and presentations

On 20 October 2021, the System Operator held a sector briefing on follow up actions on the events of 9 August 2021.


20 Oct sector briefing on 9 Aug actions PDF for website.pdf [ pdf 1.37 MB ]