Tasmania achieved 100% renewable energy penetration on 26 May 2026 during the evening peak period (20:05–20:40 UTC), with hydro generation (approximately 3,093 MW across multiple units) and wind generation (approximately 275 MW) supplying all demand. Regional reference prices (RRP) remained relatively stable in the $87–$88 range for most of the period, with a notable spike to $95.99 in the final settlement interval.
The 100% renewable penetration reflects Tasmania's abundant hydroelectric capacity and moderate wind generation during this period, enabling zero reliance on fossil fuel generation (GAS_OCGT). The binding constraint T_BLINK_TV_NGZ—representing interconnector flow limitations between Tasmania and Victoria—carried a substantial marginal value of $7.31 million, suggesting tight transmission capacity was a critical constraint limiting power transfer out of the region; this constraint likely drove the price spike in the final interval (20:40) as demand fluctuated and interconnector congestion forced marginal pricing upwards despite dominant renewable 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.