Reliability Panel invites submissions on the definition of unserved energy

The Reliability Panel today started a review of the definition of unserved energy used in evaluating whether the reliability standard has been met.

The reliability standard, which guides how much electricity capacity is needed, is expressed in terms of wholesale unserved energy – that is, the maximum expected unserved energy from generation and interconnectors must not be more than 0.002 per cent of the total energy demanded in a given year.

The Panel is seeking to clarify and simplify the definition of unserved energy used in post-event analysis of wholesale supply interruptions. This will involve examining what should be included or excluded from the calculation of unserved energy. This could provide clearer and more accurate information to the market about whether the reliability standard was met, and hence if and where more capacity may be needed.

The Panel is seeking feedback on key issues including: 

  • whether or not the current definition, based on a contingency-based framework, remains fit for purpose given the changes occurring in the power system
  • the clarity of the existing definition
  • the types of events that should be included or excluded from the calculation. 

Submissions to the consultation paper are due by 02 May 2019.

Media: Prudence Anderson, Communication Director, 0404 821 935 or (02) 8296 7817