Asia Demand Note, Saturday, 1 August 2026
Issued 21:40 UTC | For JST and AEST market opens
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The dominant read across both hemispheres this morning is a Southern Hemisphere winter heating pulse anchored in Victoria and New South Wales, while Japan's heat builds unevenly inland, leaving Tokyo cooling demand running below seasonal pace even as Chubu and Kansai push materially above it.
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Japan
The Pacific High is the controlling mechanism over Honshu this week, but its grip is not uniformly tight. Tokyo's accumulated cooling degree days stand at 144.2 against a seasonal normal of 155.9, an anomaly of -11.7, a gap that has been widening incrementally, with the prior reading at 142.6 showing only modest progression. The marine layer influence and slightly displaced high-pressure axis are keeping the Kanto coastal strip cooler than the interior, and aircon load in the Tokyo service area remains subdued relative to where the calendar says it should be. JEPX Tokyo evening peak dynamics follow the aircon load closely in August, and a below-normal CDD trajectory is the relevant frame here.
The picture shifts when you move inland. Chubu's CDD accumulation sits at 178.2 against a normal of 167.1, an anomaly of +11.0 that has been building from a prior reading of 170.3, the inland basin heat is compounding. Kansai is the most striking regional signal in Japan, with CDD at 190.9 versus a normal of 175.4, an anomaly of +15.5, advancing from 189.3 the previous run. The Osaka-Kyoto corridor retains daytime heat efficiently under Pacific High conditions, and this kind of anomaly, sustained, not a single-day spike, reflects the kind of aircon persistence that pressures afternoon and evening baseload across the Kansai service area.
The teleconnection backdrop is permissive rather than forcing. The Arctic Oscillation at +1.23 keeps the polar vortex contained and reduces the chance of a cold-air intrusion disturbing the Pacific High's position. The Niño 3.4 index at +2.50 reflects a meaningful warm anomaly in the central-eastern Pacific that, through typical warm-ENSO summer pathways, tends to reinforce the western Pacific ridge and sustain heat over central and western Japan. No baiu remnant or frontal re-activation is apparent in the indices; the regime classification is benign, meaning the degree-day path is inside normal variability at the Japan aggregate level, but the regional split between a cool Tokyo and a hot Kansai-Chubu corridor is the operative detail traders should hold.
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Australia
The Southern Annular Mode at +2.79 is the key atmospheric driver for southeast Australia this winter. A strongly positive SAM shifts the westerly wind belt poleward, which generally reduces the frequency of frontal passages into the southern mainland, but it can also concentrate and amplify individual frontal events when the belt does buckle northward. The net effect for the NEM this week is a mild but persistent heating load rather than an acute cold event.
Victoria is carrying the largest absolute HDD accumulation across the NEM regions: 116.6 against a seasonal normal of 109.2, an anomaly of +7.4, building from a prior reading of 114.2. The Victorian grid's gas and dispatchable generation mix responds to this kind of steady HDD accumulation with elevated morning and evening peaks, and the trajectory here shows no sign of rolling over. South Australia sits at 96.95 against a normal of 93.0, anomaly +4.0, though down from 103.95 previously, that step-back warrants attention, as it may reflect a brief moderation ahead of a renewed push, or a smoothing artifact as the weekly accumulation resets.
New South Wales is the other region to watch. HDD accumulation stands at 82.25 against a normal of 70.3, an anomaly of +12.0, advancing from 80.9. That is the largest percentage departure from normal of any NEM region and represents sustained residential and commercial heating load above what the grid typically prices in for this time of year. Queensland's heating anomaly at +2.2 is smaller in absolute terms, though the prior reading of 42.0 pulling back to 27.7 in the current run reflects the expected sub-tropical moderation.
The IOD at +0.38 is in weakly positive territory, which in austral winter typically supports drier-than-normal conditions across southern Australia, consistent with the ridge-dominated pattern the positive SAM is sustaining. Cooling demand is negligible across all NEM regions, as expected in August; this is purely a heating-load story. The regime classification is benign at the aggregate level, but the NSW anomaly at +12.0 HDD above normal is the most elevated regional departure anywhere in this data packet.
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What to Watch
Two things deserve attention at the next model run. First, whether Kansai's CDD accumulation continues to advance at the current rate of roughly 1.6 per run, if that trajectory holds, the anomaly against normal will continue widening and the region's heat signal will move further from the benign baseline. Second, the South Australia HDD reading, which pulled back sharply from 103.95 to 96.95; the next run will clarify whether this is genuine frontal moderation or a transient smoothing effect, and the direction of that revision carries implications for the southern NEM heating stack heading into next week.