Closing date for submissions 5pm Tuesday 3 June 2025
Transpower, as the system operator, is responsible for publishing the medium-term security of supply assessment (SOSA) annually. This assessment provides a 10-year assessment (2025 to 2034) of the balance between supply and demand in the New Zealand electricity system.
Its purpose is to inform risk management and investment decisions by generators, other market participants, and investors.
It forms part of New Zealand’s electricity security of supply framework. The system operator performs other security of supply-related functions described in the Security of Supply Forecasting and Information Policy (SOSFIP) and the Emergency Management Policy (EMP).
We are seeking feedback on the draft 2025 SOSA to consider prior to the final publication which will be no later than 30 June 2025.
Consultation Documents
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2025 SOSA - Draft Cover Note - Consultation Version.pdf (PDF 155.71 KB)
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2025 SOSA - Draft Report.pdf (PDF 5.49 MB)
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2025 SOSA - Draft Appendices.pdf (PDF 2.01 MB)
Providing feedback
Consultation submissions for this year’s assessment should be emailed to [email protected] by 5 pm on 3 June 2025. Submissions received after this date are unlikely to be considered. Please include the phrase “2025 Security of Supply Assessment Submission” in the email subject line.