South Australia (SA1) experienced high renewable penetration of 88.9%, driven predominantly by wind generation (657.73 MW) and solar output (272.21 MW combined), with minimal thermal generation. Regional reference prices exhibited volatility during the settlement period, ranging from $23.14/MWh to $93.44/MWh, reflecting the variable renewable generation profile.
The high renewable penetration reflects abundant wind and solar resources available during the settlement window. Price volatility appears linked to multiple binding constraints with marginal values, particularly the F_S+TBTU_R1 constraint (marginal values $31.29 and $15.48) and F_TASCAP_RREG_0220 constraint (marginal values $12.19 and $8.98), which suggest network or system capability limitations were restricting renewable export or constraining system operation, requiring supplementary generation dispatch and creating price spikes at settlement intervals 23:35 and 23:45.
Causal analysis generated by gridIQ's synthesis model from live AEMO market data: dispatch prices, generation mix, interconnector flows and market notices in the interval surrounding the event.