Tasmania's TAS1 region achieved 100% renewable energy penetration on 1 June 2026 at 20:05–20:30 UTC, driven by combined hydro generation (approximately 1,114–812 MW) and wind output (198–213 MW) with no thermal generation required. Regional electricity prices remained stable at approximately $79.90–$79.95/MWh across the settlement period, indicating a well-balanced supply-demand equilibrium.
The 100% renewable outcome reflects Tasmania's abundant hydroelectric capacity and favourable wind conditions during the evening period, eliminating the need for fossil fuel generation. The binding constraint F_T+RREG_0050 (marginal value $5–$5.80/MWh) suggests network or ramping limitations were active, likely related to Basslink interconnector management or intra-regional transmission constraints, which prevented further price suppression despite zero-marginal-cost renewable generation dominating the mix.
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.