Adapting and managing Under Frequency Load Shedding at times of low demand

The following reports outline analysis on adapting and managing under frequency load shedding (UFLS) in the NEM at times of low demand:

South Australia

  • Appendix A of the Final 2020 Power System Frequency Risk Review – Stage 1 explores the impacts of distributed PV on the operation of emergency frequency control schemes in South Australia in periods with high distributed PV generation.
  • An update on the progress to address issues identified with the UFLS in South Australia is outlined in section 6 of the Power System Frequency Risk Review – Stage 2 Final Report. This section also includes the proposed scope of the submission to the Reliability Panel for a new protected event relating to the separation of South Australia from the rest of the NEM.
  • An updated and expanded constraint set has been implemented to keep imports into South Australia across the Heywood interconnector within limits that reduce the risk of cascading failure and a black system if South Australia separates from the rest of the NEM.
  • AEMO is working with SA Power Networks to introduce dynamic arming of the UFLS scheme in South Australia. Dynamic arming, which enables UFLS circuits to be automatically disarmed when they are in reverse flows, is one of a suite of recommendations by AEMO to address issues with UFLS due to the high distributed DPV generation in the region.


  • AEMO has delivered a report to Network Service Providers in Victoria, outlining analysis on the amount of net load in the Victoria UFLS scheme and impacts of distributed PV. The report highlights areas where action is required to manage growing levels of distributed PV while maintaining an adequate emergency under-frequency response in Victoria.


  • Analysis is underway, and AEMO is engaging with Network Service Providers.

New South Wales

  • Analysis is underway, and AEMO is engaging with Network Service Providers.
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