Corporate publications

Value of Lost Load (VoLL) study

We have undertaken an investigation of the Value of Lost Load (VoLL) to inform our expenditure decisions and regulatory applications.

VoLL represents the economic value, in dollars per MWh, that a consumer places on electricity they plan to consume but do not receive because of a power interruption.  It is different in concept to the price consumers pay in the wholesale and retail markets for electricity.  Both the wholesale and retail prices reflect consumers’ demand for electricity, whereas VoLL reflects consumers’ demand to avoid power interruptions and its consequences. 

Auckland Strategy Final Report

Auckland is changing. Rapidly. Roads, housing, technology, industry and electricity.

Our Auckland Strategy looks specifically at the importance of electricity transmission into and across Auckland today and into the future.

Our capacity for meeting Auckland’s future electricity needs is very good, and we can meet all demand and growth projections for the next 30 years.

We also need to keep the grid in great shape and we have an extensive maintenance programme on our existing 220kV lines over the next 30 years. We are planning for this work now.

Securing our energy future - RCP3 consultation document

Shaping our draft proposal to the Commerce Commission for our third Regulatory Control Period (RCP3) depends on input from our stakeholders. We appreciate that many of you have shaped our consultation document through the extensive engagement processes we have undertaken to date.

This consultation document includes 20 questions on which we are seeking your input and feedback. We will be collecting your views prior to our formal proposal submission to the Commerce Commission on 3 December 2018.

Statement of Corporate Intent 2017/18

This Statement of Corporate Intent (SCI) is submitted by the Board of Directors of Transpower New Zealand Limited, in accordance with Section 14 of the State-Owned Enterprises Act 1986. It sets out the Board’s overall intentions and objectives for Transpower New Zealand Limited and its subsidiary companies for the year commencing 1 July 2017 and the following two financial years.

Transmission Planning Report - July 2017

Transpower regularly publishes a Transmission Planning Report (TPR) which details the grid asset capability over the next 15 years.

We have evolved our TPR this year to include a Grid Enhancement Approach. These new sections, in each regional chapter, provide more detail on active and potential investment investigations, linking the current investigation status to our planning processes and portfolio funding.

Market impact assessment from changes to HVDC cost allocation

The methodology to allocate the HVDC costs to South Island (SI) generators was changed in 2015. This change involved transitioning from the peak-based metric (HAMI) to an average-based metric (SIMI) from the 2017/18 pricing year (PY). The allocation based on HAMI resulted in a strong incentive for SI generators to maintain generation below established HAMI levels (HAMI limits) thus avoiding increased allocation of HVDC costs. The change to SIMI was intended to reduce this incentive, thus increasing the availability of SI generation capacity.

The Development Guide

This guide provides information on the types of issues that development near National Grid lines can have on the lines and, conversely, the issues National Grid lines can have on development.  It works through the different types of development and suggests ways of addressing the issues identified and provides some ideas on how land can be used and developed in ways that are safe and compatible with the existing National Grid lines.