Tasmania's TAS1 region achieved 100% renewable penetration during the period from approximately 06:05–06:30 UTC on 18 April 2026, with generation supplied entirely by hydro (peaking at around 683 MW) and wind (approximately 50–57 MW). Spot prices were relatively stable and moderate, ranging from $88.16 to $96.20/MWh, indicating no significant supply-demand stress despite the all-renewable generation mix. Gas OCGT capacity remained offline throughout the observed interval.
Tasmania's 100% renewable outcome is a routine occurrence given the region's predominantly hydro-based generation fleet, which provides dispatchable renewable capacity capable of meeting baseload and peaking requirements without fossil fuel support. The binding constraint F_MAIN+RREG_0220, which relates to mainland raise regulation frequency control ancillary services (FCAS), carried a notable marginal value and likely reflects the Basslink interconnector configuration and Tasmania's obligations to provide frequency regulation to the broader NEM. The V_T_NIL_BL1 constraint, associated with Basslink flow limits, suggests interconnector conditions were also influencing dispatch, potentially limiting export to or import from Victoria and contributing to the modest but stable price outcome.
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.