Closing date for submissions, is 5pm on Monday 24 November 2025.
Transpower, in its role as System Operator, is seeking feedback on the proposed assumptions and sensitivities for the 2026 Security of Supply Assessment (SOSA). The SOSA is an annual publication that provides a 10-year outlook on the balance between electricity supply and demand in New Zealand. It supports risk management and investment decisions by market participants, policy makers, and other stakeholders.
This consultation invites stakeholders to provide feedback on:
- The proposed Reference case assumptions, which represent expected resources available to the power system over the next decade.
- The proposed supply and demand side sensitivities, which explore plausible variations from the Reference case under different future scenarios.
- Our proposal to introduce an Expected Future case that would represent the combination of Reference case sensitivities we think (at the time of publishing SOSA 2026) reflect our current view of a most likely outcome for the 10-year modelled period (2026-2035). We could then report on how the market is actually tracking against this expected future case through our quarterly Security of Supply Outlook updates
Consultation Document
Submit Your Feedback
Please prepare your submission in electronic format (in Microsoft Word), using the template above. Submissions and cross submissions should be emailed to [email protected] by 5 pm on Monday 24 November 2025. Please include the phrase “2026 Reference Case and Sensitivities” in the email subject line.
All submissions will be acknowledged and published on our website, subject to confidentiality requirements. If your submission contains confidential material, please clearly identify it and provide a version suitable for publication. We intend to publish all submissions. Note that all information provided to Transpower is subject to potential disclosure under the Official Information Act 1982.
If you have any questions about this consultation, please contact us at [email protected].