Asia Demand Note, Monday, July 06, 2026
Victoria is running 17.6 heating degree days above the seasonal normal, the sharpest thermal anomaly in either basin this morning and the clearest signal for above-trend gas-fired generation across the NEM's highest-load corridor.
Japan
The Pacific High has established its summer pattern over the western Pacific, suppressing frontal systems and channelling the season's characteristic heat southward across Honshu. Kansai leads the cooling load picture with 152.25 accumulated CDD15s against a normal of 136.66, a positive anomaly of 15.6 degree days. Chubu follows at 136.55 CDD15s against 127.08 normal (+9.5), while Tokyo tracks just 2.1 units above its seasonal baseline at 129 CDD15s, the gradient from the Kanto plain westward through the inland basins is the defining feature of the current setup.
That Kansai-Chubu corridor running warm while Tokyo sits close to normal reflects the Pacific High's current positioning: its western flank is amplifying heat over central Honshu without pushing it as forcefully into the Kanto region. The circulation background supports this structure. The Arctic Oscillation sits at +1.23, indicating a strengthened circumpolar vortex and reduced likelihood of high-latitude blocking that might otherwise displace cold air southward. The PNA index at +0.07 is near neutral, consistent with an undisturbed Pacific pattern. The El Niño signal (Niño 3.4 at +2.10) is the most significant teleconnection in play: moderate El Niño typically sustains above-normal sea-surface temperatures across the western Pacific, which in summer reinforces the Pacific High and prolongs warm, stagnant air mass episodes over urban Japan. Air-conditioning load on the JEPX Tokyo area price is most sensitive during evening peak hours when residential demand stacks with commercial drawdown; Chubu and Kansai show more persistent daytime exposure through manufacturing and commercial sectors. The overall Japan regime reads BENIGN by the tripwire system, no threshold has been crossed, but the Kansai anomaly at +15.6 is sitting in the upper tier of the current gradient.
Australia
Austral winter deepens across the NEM zones, and positive heating degree day anomalies are widespread. Victoria carries the largest departure from normal at 138.85 HDD15s against a seasonal baseline of 121.22, an anomaly of +17.6 degree days. South Australia sits at +10.8 above normal (113.5 HDD15s versus 102.71). New South Wales shows a +7.4 anomaly at 91.65 HDD15s, and Queensland, while milder at 44.65 HDD15s, is running 4.2 above its normal.
The synoptic driver is consistent with a positive Southern Annular Mode. The SAM index at +2.79 describes a state where the mid-latitude westerly belt has contracted poleward and strengthened, concentrating frontal activity and cold-air advection along the southern coastline of the continent. This mechanism fits the observed pattern: the sharpest anomalies are in Victoria and South Australia, which sit in the direct path of those amplified Tasman fronts and Southern Ocean incursions when the SAM is positive and the westerlies are tracking close to the continent's southern edge. Queensland and New South Wales, further from the frontal corridor, show smaller but still above-normal heating loads.
The IOD at -0.29 is slightly negative, a value associated with above-normal rainfall and cloud cover over southeastern Australia in the cooler months, which tends to reinforce the cold-bias signal from the positive SAM. Neither index has crossed into a regime-defining threshold, which is why the overall AU designation remains BENIGN, but the combination of a strongly positive SAM and a modestly negative IOD creates a background state that keeps the heating demand anomaly elevated across Victoria and South Australia.
The NEM gas-fired fleet in Victoria and South Australia carries the most direct demand-side exposure to the current HDD anomaly. AEMO dispatch pricing in those regions during morning and evening peak hours will reflect the heating load stacking against winter baseload commitments.
What to Watch
The SAM index is the primary lever to monitor on the Australian side. A retreat from +2.79 toward neutral would reduce the frequency and depth of frontal intrusions along the southern coastline and ease the Victoria-South Australia HDD anomaly. On the Japan side, watch for the next ensemble run's Pacific High positioning: if the centre of the anticyclone shifts further east, it could amplify the Kanto load and bring Tokyo into tighter alignment with Kansai's current positive anomaly, broadening the demand picture across more JEPX bidding zones.