Power system operation

Security of supply is a measure of the power system's capacity to continue operating within defined technical limits, even in the event of the disconnection of a major power system element such as an interconnector or large generator.

Reliability is a measure of the power system's capacity to continue to supply sufficient power to satisfy customer demand, allowing for the loss of generation capacity.

AEMO's system operating procedures are developed primarily for AEMO to provide information related to the management of the National Electricity Market (NEM) and security of the power system.

Guidelines for preparing Local Black System Procedures

Clause 4.8.12 (e) of the National Electricity Rules requires AEMO to develop and publish guidelines for preparation of local black system procedures in consultation with Generators and network service providers.

Scope of Delegations to TNSPs

AEMO has the power to delegate to TNSPs some of the AEMO power system security responsibilities under clause 4.3.3 of the National electricity Rules. The linked page below has details of the delegations made to a number of TNSPs in the NEM.

Reserve Level Declaration Guidelines

An LOR declaration alerts Registered Participants to a probability of capacity reserves being insufficient to avoid load shedding (other than interruptible load) given reasonably foreseeable conditions and events.

These are the reserve level declaration guidelines made under clause 4.8.4A of the National Electricity Rules (Guidelines).

These Guidelines  describe the considerations and methodology AEMO applies in deciding to declare an LOR condition, and the levels of LOR conditions that may be declared.

Power System Operating Procedures

Power System Operating Standards

Distributed Photovoltaics (DPV) Contingency and / or Minimum System Load market notice framework

AEMO has implemented a market notification framework to increase transparency on actions taken to maintain power system security, and seek a market response where possible, during challenging system operating conditions coupled with high rooftop solar PV exports.

These new market notifications will support market development and better communicate power system risks and the operational response, while industry also works on future solutions to better integrate Distributed Energy Resources and drive consumer participation in emerging and new markets.

AEMO’s new framework, similar in concept to the Lock of Reserve (LOR) process, consists of three Distributed Photovoltaics (DPV) Contingency and / or Minimum System Load market notices:

  1. Forecast potential Contingency or Minimum System Load event and seeking a market response.
  2. Advise action has been taken to maintain system security.
  3. Notify that curtailment of rooftop solar PV is occurring as a last resort because preceding actions have not been sufficient to maintain power system security.
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