Market ancillary services specification and FCAS verification tool

The market ancillary services specification ( MASS) contains:

  • A detailed description of each kind of market ancillary service.
  • The performance parameters and requirements which must be satisfied for a service to qualify as the relevant market ancillary service, and also when a market participant provides the relevant kind of market ancillary service.
  • Verification procedures for market ancillary services.

The FCAS verification tool (FCASVT) is an Excel spreadsheet that has been made available to NEM participants to calculate FCAS delivered by their plant.

The FCASVT will calculate fast raise (R6), slow raise (R60), delayed raise (R5), fast lower (L6), slow lower (L60), and delayed lower (L5), delivered in accordance with the MASS. The FCASVT also allows the user to inspect in detail how the MASS is applied in processing data to arrive at a result.

The new VT implements the changes made in V7.0 of the MASS and feedback provided by interested parties. It has undergone internal testing by AEMO however it is provided ‘as-is’ and AEMO makes no guarantees about the completeness or correctness of the VT. AEMO seeks to regularly improve the tool, and feedback can be provided to Freq_Event.Data@aemo.com.au. Note that in the event of any inconsistency between the VT and the MASS, the MASS prevails.

The wind and solar contingency FCAS testing requirements have been developed by AEMO for operators looking to classify wind and solar generation as ancillary services generating units for contingency FCAS.

The Battery Energy Storage System (BESS) requirements for contingency FCAS registration have been developed by AEMO to assist market participants in the NEM looking to register a BESS to provide contingency FCAS.

MASS Consultation

The Australian Energy Market Operator (AEMO) has initiated consultation on the Market Ancillary Service Specification (MASS) with regards to incorporation of very fast frequency control ancillary services (very fast FCAS).
More information is available at the MASS Consultation webpage

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