Non Market Ancillary Services Annual Summary

AEMO procures several Non-Market Ancillary Services (NMAS) to support power system security and quality of supply in the National Electricity Market.

AEMO publishes this report annually to provide information about the costs and quantities of NMAS it has procured.

There are four types of NMAS AEMO can procure:

1. System Restart Ancillary Services (SRAS)
2. Network Support and Control Ancillary Services (NSCAS)
3. Transitional Services
4. Other System Security Services

There are two types of NSCAS:

1. Reliability and Security Ancillary Service (RSAS)
2. Market Benefit Ancillary Service (MBAS)

AEMO and Transmission Network Service Providers (TNSPs) can procure RSAS, and only TNSPs can procure MBAS.

Transitional Services

Transitional services may be procured by AEMO to maintain power system security during the transition to a low or zero emissions power system. Transitional services can be acquired:

• to address power system security needs or issues that cannot be met by existing frameworks; or
• for the purpose of trialling new technologies, or a new application of existing technologies.

Other System Security Services

AEMO may operationally enable system security services to achieve and maintain both minimum and efficient system security requirements under NER 4.4A.

System security services enabled by AEMO under NER 4.4A.1 and reported in this section include:

• Minimum System Strength Services
• Minimum Inertia Network Services
• Efficient System Strength Services (Stable Voltage Waveform (SVW))

Non-Market Ancillary Services Annual Summary Reports

These annual reports provide the annual costs and quantities per NMAS service per region. For more detailed information on NMAS costs (weekly) see the Ancillary Services Payments and Recovery page in this section.