NEM Overview: Saturday 23 May 2026

NEM spot prices at 06:30 AEST sit in a tight $65–$97/MWh band across the eastern states, with Tasmania the clear outlier at $97.04/MWh against a NEM mainland range of $64.79–$78.99/MWh. Queensland leads the mainland at $78.99/MWh and NSW follows at $76.94/MWh, while Victoria ($67.47/MWh) and SA ($64.79/MWh) are the softest. The Tasmania premium reflects its isolation this interval — Basslink (T-V-MNSP1) is showing zero flow, leaving the island running on its own hydro and wind stack (1,003 MW hydro, 93 MW wind) with no mainland support. Western Australia is the priciest market on the board at $101.18/MWh, though it operates independently of the NEM. VIC-NSW interconnector is carrying 652 MW northbound, well within its 1,006 MW export limit, supporting NSW supply in the overnight period.

NEM-wide renewable penetration sits at 39.7% per the current grid score. Wind is the standout overnight contributor: SA is generating 1,250 MW of wind against a regional demand of just 1,249 MW, effectively covering its entire load from wind alone with gas OCGT (63 MW) and CCGT (41 MW) on standby. Carbon intensity reflects this starkly — SA is at 0.045 tCO2/MWh versus Queensland's 0.748 tCO2/MWh and Victoria's 1.021 tCO2/MWh, where brown coal accounts for 4,439 MW of the 5,305 MW regional output. NSW wind is contributing 735 MW and hydro 541 MW alongside 4,466 MW of black coal. Solar output is negligible across all regions at this pre-dawn hour. Grid stress is elevated at a score of 88.7, which warrants attention.

The most significant active notice is an AEMO direction issued to a participant in SA at 04:05 AEST this morning (Market Notice 144136), commencing an intervention event. This is the third SA direction in the past ten days — previous events on 14 and 15 May were voltage-related, and the pattern is consistent with system strength and synchronous inertia management during high-wind, low-demand overnight conditions. Intervention pricing does not apply to this event. A separate Queensland direction from yesterday was cancelled at 14:30 AEST after the secure operating state requirement resolved through market response. Traders should monitor SA pricing and any further market notices through the morning as the direction remains active with no cancellation notice yet issued.

Today's outlook is relatively benign on the demand side — it is Sunday, temperatures are mild across all regions (Sydney 15°C, Melbourne 9°C, Brisbane 16°C), and heating demand is modest. Queensland will see solar potential lift through the day (forecast avg 8.4), which should put downward pressure on QLD midday prices. SA cloud cover is forecast at 79% today, limiting solar uptake there. Wind potential looks moderate across SA and Victoria through today. The overnight EMMS datacentre transfer scheduled for 26 May (18:00–19:00 AEST) is worth noting for systems teams — FPP delivery and Market Portal access will be intermittently affected during that window.