Transmission pricing methodology

TPM technical amendments: regulatory asset base indexation and simple method benefit-based charge cap

Upcoming Open Closed Decision
View submissions Submissions closed 29 August 2025
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Decision

Thanks to everyone who provided feedback on two proposed technical amendments to the transmission pricing methodology (TPM).

A decision has been made and we have opted to make two technical amendments to the TPM to:

  • implement indexation to reflect the Commerce Commission’s decision to index Transpower’s regulatory asset base (RAB), and
  • clarify the formula for the simple method benefit-based charge cap (SMBC) to ensure consistent treatment of new customers.

These proposed changes will help ensure the transmission pricing methodology continues to function as intended.

A well-functioning transmission pricing methodology supports timely, well-placed investment and use of the grid, and the electrification of the economy for the benefit of all New Zealanders.

Decision paper

TPM technical amendments - Decision paper

TPM technical amendments - Decision paper

Consultation paper

TPM technical amendments: Implementing regulatory asset base indexation and clarifying the simple method benefit-based charge cap - Consultation paper

TPM technical amendments: Implementing regulatory asset base indexation and clarifying the simple method benefit-based charge cap - Consultation paper

Submissions