Tasmania achieved 100% renewable energy penetration on 15 May 2026 during the evening peak period, with hydroelectric generation (approximately 1,512 MW combined) and wind generation (approximately 708 MW combined) meeting all electricity demand. Regional reference prices remained stable around $95–96/MWh for most of the period, before rising sharply to $105.92/MWh in the final 5-minute settlement interval.
The 100% renewable penetration reflects Tasmania's abundant hydro and wind resources operating simultaneously during favourable conditions. The price spike at 18:05 was likely driven by binding transmission constraints (F_TASCAP_RREG_0220 with an $8.55/MWh marginal value and F_T+RREG_0050 with a $4.02/MWh marginal value), which constrained the ability to export excess renewable generation to other regions in the NEM, causing localised congestion pricing despite abundant available supply.
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.