Interconnector Watch

At 17:30 AEST, VIC-NSW (VIC1-NSW1) is the sole binding interconnector, exporting 820 MW from Victoria into NSW at its export limit. This is the critical market signal this interval: Victoria is clearing at $10.22/MWh against NSW at $56.98/MWh — a $46.76/MWh spread that is fully explained by this constraint. The interconnector is physically saturated northbound; no additional Victorian generation can arbitrage into NSW, leaving NSW price formation effectively decoupled from the cheaper southern surplus.

Heywood (V-SA) is moving 492 MW from SA into Victoria, running at 77% of its import limit of 640 MW — firm flow but not binding. SA is the cheapest region on the board at $8.70/MWh, and that excess is being absorbed into Victoria's already-soft dispatch stack. Murraylink (V-S-MNSP1) is also flowing SA-to-VIC at 95 MW, pinned exactly at its export limit of -95.08 MW — effectively at capacity in that direction, though not flagged as formally binding. Combined, SA is pushing roughly 587 MW net into Victoria this interval.

Basslink (T-V-MNSP1) is exporting 125 MW from Tasmania into Victoria, operating at 37% of its 337 MW import capacity — well short of binding. Tasmania is the most expensive region at $96.14/MWh against Victoria's $10.22/MWh, a spread of $85.92/MWh. The relatively modest Basslink flow suggests Tasmania's high price is driven by constrained local supply rather than an inability to export; the link has significant headroom but Tasmania is likely facing intra-regional or hydro dispatch limitations. QNI (NSW1-QLD1) is carrying 493 MW northbound into Queensland at 61% of its 809 MW import limit — not binding, but a substantial flow consistent with the tight $4.24/MWh NSW-QLD spread. N-Q-MNSP1 (Directlink) is moving 25 MW northbound at 24% utilisation, marginal. No constraint notices are active across the NEM this interval.

The dominant market structure right now is a two-bloc split: a soft southern bloc (SA, VIC) with excess renewable generation clearing below $11/MWh, pushing hard against a saturated VIC-NSW seam, while NSW and QLD hold in the $53–$57/MWh range with inter-regional arbitrage capped by that binding constraint. Traders long in NSW or short in VIC are benefiting directly from this congestion. The binding VIC-NSW limit is the single most important variable to watch for the morning session.