Clutha Upper Waitaki Lines Project FAQs

Noise performance of new conductors in Waikanae

The noise qualities of the old conductor previously installed on the transmission lines through Waikanae had improved over time due to aging. Transpower undertook extensive research to obtain a replacement conductor that provides the best achievable noise performance for a new conductor, (see factsheet at bottom of page). However, in wet conditions only, the new conductor will still initially sound different in character and level. 

Live line work

Live line work

Transpower temporarily suspended live line work on the National Grid in May 2017, while it assessed the practical implications of the new EEA Guide for the Assessment of Work Methods to Undertake High Voltage Overhead Line Work.

Following an investigation exploring the risk associated with different work activities, Transpower lifted the suspension in September 2018. Transpower has a series of live line techniques available for Service Providers, a full list is available below.

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. 

Grid capability and configuration

Interconnection asset reports: Capacity and Grid Configuration, and Availability and Reliability

This .pdf contains the grid asset capacity and configuration report published under 12.118, and the availability and reliability report published under 12.127 (refer page 37 onwards of the report below).

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.

Outage Planning

Outage Co-ordination is an essential part of managing the operation of the power system in a secure and efficient manner.

Outage Planning Policy

This policy is to clarify how, in Transpower's dual roles as system operator and owner of the national grid, we will meet our obligations around outage planning, coordination and assessment.

This policy will mean: