Transmission Pricing Methodology

Implementing a new TPM

On 12 April 2022, the Electricity Authority (Authority) announced its decision to adopt a new Transmission Pricing Methodology (TPM). Transpower is now working to implement the new TPM into prices that will take effect from 1 April 2023. The Authority's decision paper and the new TPM are available on the Authority's website.

The TPM determines how Transpower recovers the annual cost of running the national transmission grid from transmission customers. To help people understand the new TPM we have prepared a short Guide to the TPM. Over time, and as we work to implement the new TPM into prices, we intend to develop and share more information about how it will work in practice.

Next steps

There is a lot to do to implement the new TPM into prices that will take effect from 1 April 2023, including running several consultations with customers. 

We are now consulting on a draft assumptions book for benefit-based charges (BBC) and the proposed cost allocations for a committed benefit-based investments commissioning this year – Clutha Upper Waitaki Lines Project (CUWLP).

Further information

Please email if you have any questions about the implementation of the new TPM.  For information related to the development of the new TPM, please see our TPM Development pages. Indicative pricing updates can be found here.


You can also sign up to our TPM newsletter update here:


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