This review is about enhancing transparency and future-proofing transmission prices for the future as Aotearoa New Zealand becomes increasingly electrified.
Purpose of the review
The TPM determines how Transpower recovers the annual cost of running the national electricity grid from our transmission customers.
We want to make sure the TPM continues to meet its intended objectives and that customers can easily understand and manage their transmission charges.
Since the EA introduced the new TPM in 2023, we’ve listened to feedback from customers and investors about how it could work better, particularly around reducing uncertainty, volatility, and complexity.
After engaging with stakeholders, we’ve decided that a focused operational review is the best way to address these challenges with the TPM.
What we’ve done so far
Earlier in 2025, we worked with Concept Consulting to complete a two-stage Post-Implementation Review (PIR) of the TPM.
The PIR gave us valuable insights into how well the TPM is meeting its intended objectives, what’s working and where improvements could be made.
The review included:
- Stage 1: An online survey of stakeholders, including electricity distribution businesses, grid-connected customers, and electricity generators.
- Stage 2: Workshops to explore the key themes and ideas raised in the survey.
You can read the full PIR report here.
Next steps
We’re working closely with the EA and will set up an industry working group to support the review, with work to commence early next year.
This group will ensure voices from across the sector are part of the conversation and help shape any proposed changes. We will share updates about our work on this page and in our TPM newsletters. You can sign up to receive these here.
More information
For more information about the operational review, please contact us at [email protected].
You can find more information about the TPM here on our website.
The TPM itself is available on the EA’s website.