Submission to AEMO’s Market Ancillary Services Specification (MASS) stage 3

Publication date:
18 November 2021
Resource type:

PIAC responded to the Australian Energy Market Operator’s (AEMO) consultation on amendments to the Market Ancillary Service Specification (MASS). We supported the second draft determination to require a minimum measurement time resolution for fast Frequency Control Ancillary Services (FCAS) providers of:  

  • 200 ms for aggregated facilities with no inertial response (5% error applies if number of sites is less than 200); and 
  • 50 ms for all other facilities.  

We commended AEMO for taking extra time to consider the issue of measurement resolution and propose a solution that better serves the interests of consumers.  


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