Collecting energy margin information
Decision
Thanks to everyone who provided feedback in this consultation.
We have decided to introduce a requirement for electricity generators to provide financial information, so we can calculate energy margins on an ongoing basis.
We will publish aggregated, averaged energy margin data on a monthly basis alongside the average weekly spot price to improve transparency, strengthen our monitoring of market outcomes, and support confidence in the wholesale electricity market.
Energy margin data helps us better understand what is happening in the wholesale electricity market and how profitable generation is, particularly during periods of high prices. We will use this information alongside our existing monitoring to better understand market outcomes and support our assessment of whether the market is working well.
The notice applies from 5 July 2026 and the first publication will be in September 2026.
Consultation
This consultation sought feedback on a proposal to collect and publish information on generators’ energy margins.
We want to regularly collect financial information from large generators to calculate energy margins to provide insights into generator profitability in various market conditions.
The data will help us to monitor competition in the wholesale electricity market, particularly during periods of scarcity.
Submissions
-
2degrees2 pages
-
350 Aotearoa6 pages
-
Contact Energy2 pages
-
Edward Miller Cictar2 pages
-
ERGANZ5 pages
-
Genesis20 pages
-
Meridian5 pages
-
MEUG1 page
-
Nova4 pages