Industry

Distributed BESS in New Zealand – Power System Operational Implications – Technical Report

Advances in battery technology are expected to play an important role in enabling our energy future. Distributed Battery Energy Storage Systems (BESS) in New Zealand examines the operational impact on the power system of the widespread adoption of these systems in conjunction with the large-scale uptake of solar PV and electric vehicle charging and identifies what is required to enable a successful integration and ensure a reliable fit-for-purpose power system.

2018 Transmission Planning Report

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.

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. 

Report on 2 March 2017 South Island AUFLS Event

On 2 March 2017, New Zealand experienced a major and complex power system event. The event resulted in the South Island power system splitting into two separate systems. Approximately 120 MW (16%) of electricity used by consumers in the upper part of the South Island was disconnected for up to 90 minutes.  

This report provides the findings from the System Operator's investigation into the event.

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.

Ten Year Forecast of Fault Levels

This publication presents an update to the ten year forecast fault levels report. The Connection Code contained in Schedule 8 to the Benchmark Agreement requires Transpower to publish a ten year forecast of the expected fault levels at each customer point of service annually.

Transpower last published the Ten Year Forecast of Fault Levels in September 2015.