On 7 April 2011, the Commission gave notice under sections 102 and 103 of the National Electricity Law (NEL) to make the Network Support and Control Ancillary Services final Rule determination and Rule as Made.

The AEMC has made the Rule as Made to introduce the term NSCAS to replace the term network control ancillary service. The Rule also clarifies that transmission network service providers (TNSPs) have the primary responsibility for procuring NSCAS but the Rule as Made provides a safety net by giving the Australian Energy Market Operator (AEMO) the ability to acquire NSCAS for system security and reliability purposes. AEMO, following consultation with the relevant TNSPs, would be able to tender to procure NSCAS from any party, including non-Registered Participants and TNSPs. The new arrangements for NSCAS will commence on 5 April 2012.