The AEMC today started consultation on its review of the regulatory and market frameworks needed to support a reliable supply of electricity as the power system transforms to include more variable, intermittent generation and demand-side innovation.

Reliability of the power system is about having sufficient capacity to produce and transport electricity to meet consumer demand. A reliable system requires an adequate supply of dispatchable ‘on demand’ energy, as well as reliable transmission and distribution networks, and a secure operating state.

This review will focus on dispatchable energy. It will identify and recommend any changes needed to market and regulatory frameworks in the future so that electricity is available to be supplied to consumers when they need it at the least cost.

Dispatchable energy can be supplied through:

  • generation, including large-scale coal, gas and, and distributed energy resources such as battery storage
  • demand response and other demand-side mechanisms, for example when customers are paid to curtail their electricity consumption.

An adequate supply of dispatchable energy in the national electricity market is underpinned by investment decisions by market participants on the basis of market signals: expectations of future spot prices and the need for investors in new capacity to enter into contracts to hedge against future price risk.

The changing generation mix, with increasing penetration of non-dispatchable variable generation as well as the exit of thermal generators, and a decrease in the liquidity and duration of hedge contracts, has implications for maintaining reliability of the system, particularly on extreme weather days.

The review will take into account learnings from initiatives such as the demand response pilot program being trialled by Australian Renewable Energy Agency (ARENA) and AEMO. It will also consider recommendations from the Finkel review such as the Generator Reliability Obligation, day ahead markets and mechanisms to address demand response priorities.

The intervention mechanisms that AEMO has at its disposal to address potential shortfalls of supply, in case the market fails, will also be a focus of the review.

A reference group, comprising AEMO, the AEMC’s Reliability Panel, ARENA, the Clean Energy Regulator and the Clean Energy Finance Corporation and federal and state officials, is providing input into the review. We are also establishing a technical working group, including representatives from conventional and renewable generators, demand response providers, networks, retailers, large energy users and consumer groups, to provide advice.

Stakeholders are invited to comment on the issues raised in the paper. Submissions are due by 19 September 2017.

We will provide a progress report on the review to the COAG Energy Council by the end of 2017, with a final report due in mid 2018.

Media: Prudence Anderson, 0404 821 935 or (02) 8296 7817


How is reliability and security managed in the national electricity market?

To keep the lights on, the power system needs to be:

  • secure – able to operate within defined technical limits, even if there is an incident such as the loss of a major transmission line or large generator
  • reliable - have enough capacity (generation and networks) to supply customers.

The Australian Energy Market Operator (AEMO) is responsible for maintaining power system security and reliability in accordance with standards and guidelines, including those set by the AEMC’s Reliability Panel.

What is a secure power system?

The power system is in a secure and safe operating state if it is capable of withstanding the failure of a single network element or generating unit.

Security events are caused by sudden equipment failure (often associated with extreme weather or bushfires) that results in the system operating outside of defined technical limits, such as voltage and frequency.

The AEMC is undertaking a comprehensive work program on system security. In June 2017, the AEMC published a report with a package of reforms to guard against technical failures that lead to cascading blackouts, and to deliver a more stable and secure power supply to Australian homes and businesses. Work in the area of system security is continuing (see overview below).

What is a reliable power system?

A reliable power system has sufficient generation and network capacity to meet the consumer load in that region.

Reliability events are caused by insufficient generation or network capacity to meet consumer load.

Reliability events due to insufficient generation and interconnector capacity are usually predicted ahead of time by supply and demand forecasting. The associated consumer load shedding may be shared across parts of the NEM.

What is dispatchable energy?

Dispatchable energy is guaranteed to be available when consumers need it. It includes dispatchable generation (eg. coal, gas, hydro) and storage (eg. batteries, pumped hydro), as well as dispatchable load, for example when an aluminium smelter reduces its consumption, or other types of demand response.

Variable, intermittent generation sources, such as wind and solar, are not dispatchable, as they may not be available if the wind isn’t blowing or sun isn’t shining.

Reliability of the electricity system is maintained through having a certain level of dispatchable energy available at all times.

What is demand response?

Demand response is all about consumers making informed choices about the quantity and timing of their electricity use.

In the national electricity market, the supply side of the market provides electricity at the wholesale price. On the demand side, consumers have an opportunity to change their consumption of electricity if the price exceeds the value they gain from consumption.

By actively participating in the market through such options, demand for electricity services is efficiently met through the lowest cost combinations of demand and supply side options.

Reduced energy consumption at certain times can create savings in the costs of meeting Australia’s energy needs; in particular, the need for investment in peak generation and more poles and wires. Where such investments are efficiently avoided, the overall costs of supplying electricity can be reduced.