Market reviews
We monitor all aspects of the energy sector and carry out market reviews into out of the ordinary events or outcomes to understand the causes and if something can, or should, be done to prevent it occurring again.
Our findings may result in suggestions for Code amendments, market facilitation measures or no action.
| Date published | Title & Description | |
|---|---|---|
|
25 August 2025 |
Post implementation review of multiple frequency keeping in the North Island
A change to multiple frequency keepers in the frequency keeping market was introduced to the North Island in July 2013. |
View pdf
51 pages
|
|
8 April 2025 |
Review of winter 2024
The factors that coincided to push up wholesale electricity prices - in early August 2024, the average daily spot price reached $820/MWh. |
View pdf
54 pages
|
|
13 September 2024 |
Northland tower collapse 20 June 2024
A report on the Northland tower collapse, conducted by the Electricity Authority under section 18 of the Electricity Industry Act 2010. |
View pdf
152 pages
|
|
30 November 2023 |
Review of price separation and instances of high spot market prices in November 2022
Our understanding of the underlying conditions in November which contributed to the high energy and reserve prices and the price separation. |
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9 pages
|
|
18 May 2023 |
Review of off-peak prices on 18 May 2023
Review of the off-peak power prices in May 2023. |
View pdf
10 pages
|
|
27 April 2022 |
9 August 2021 demand management event
Approximately 34,000 customers, with over 17,000 in the Waikato region, experienced an electricity cut without warning. |
View pdf
57 pages
|
|
31 January 2022 |
January 2022 prices were due to high demand and constrained generation
This report looked at why we we’re seeing unusually high prices for this time of year. |
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13 pages
|
|
15 November 2021 |
Review of structure, conduct and performance in the wholesale electricity market
Persistently high spot prices after the 2018 Pohokura outage prompted a review of market competitiveness - this paper adds a new finding that investment may have been constrained. |
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156 pages
|
|
27 October 2021 |
Review of structure, conduct and performance in the wholesale electricity market
After the 2018 Pohokura outage, a review was carried out into whether high spot prices were determined in a competitive environment. |
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11 pages
|
|
10 September 2021 |
Immediate assurance review of the 9 August 2021 demand management event
Any problematic tools and processes used by the system operator were urgently corrected after 34,000 customers experienced a power cut. |
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37 pages
|