Network support and control ancillary services procedures and guidelines

Network Support and Control Ancillary Services (NSCAS) are non-market ancillary services that may be delivered to maintain power system security and reliability of supply of the transmission network, or to maintain or increase the power transfer capability of the transmission network. 

AEMO is required to assess NSCAS needs in the National Electricity Market for the upcoming five-year period. When AEMO identifies a NSCAS gap, the National Electricity Rules give transmission network service providers the primary responsibility for having arrangements in place to address the gap. 

AEMO may be required to acquire NSCAS only to ensure power system security and reliability of supply of the transmission network in cases where AEMO considers that the gap will remain after receiving advice from the transmission network services provider about its proposed arrangements to address the gap. 

This page provides the NSCAS procedures and guidelines. AEMO’s NSCAS assessments can be found at the Planning for operability page.