Tasmania's electricity grid reached 100% renewable penetration on 2 June 2026 at 20:05–20:35 AEST, with hydroelectric generation (650–787 MW) and wind (21–41 MW) meeting all demand. Regional reference prices (RRPs) remained stable at approximately $77/MWh for the first three intervals before rising to $80.16–80.20/MWh from 20:20 onwards.
The 100% renewable mix reflects Tasmania's abundant hydroelectric capacity and favourable wind conditions during the evening period, eliminating the need for thermal generation. The subsequent price step-up of ~$3/MWh at 20:20 was likely driven by binding transmission constraints (F_TASCAP_RREG_0220 and F_T+RREG_0050), which reduced effective supply capacity and increased the marginal value of constrained energy to approximately $4.93–4.96/MWh, reflecting physical network limitations rather than generation scarcity.
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.