Asia Demand Note, Monday, 7 July 2026
Victoria's heating degree-day accumulation running 17.6 units above normal is the dominant signal across both markets this morning, marking the sharpest positive anomaly in the packet and confirming that southeastern Australia's winter heating load is the load story of the week.
Japan
The synoptic picture across Japan is summer-typical and stable. A strengthening Pacific High is dominating the circulation over Honshu and suppressing any meaningful cold-air intrusion from the north, with the Siberian High well to the northwest and not yet organised enough to push cold surges into the region. The baiu (plum-front) season is over, and the transition into full summer suppression is progressing on schedule.
Cooling degree-day accumulation tells a differentiated story by zone. Tokyo's CDD15 sits at 129, which is 2.1 units above the seasonal normal, a modest positive anomaly that reflects above-average night-time temperatures compounding into the 15-day accumulation. Chubu is running harder: 136.55 against a normal of 127.08, an anomaly of +9.5, suggesting the Pacific High's suppression effect is more pronounced across the central Honshu mountain corridor where valley heat retention amplifies the signal. Kansai is the outlier, with CDD15 at 152.25 against a normal of 136.655, a +15.6 anomaly that places the Osaka-Kobe corridor firmly in elevated aircon demand territory. The spread between Tokyo (+2.1) and Kansai (+15.6) is a regional structure worth watching: it suggests the western Pacific High ridge is positioned to warm Kansai disproportionately, while the Kanto plain retains slightly more maritime influence.
On the teleconnection side, the Arctic Oscillation is positive at +1.23, which supports a persistent westerly regime that keeps cold air bottled at high latitudes, consistent with the absence of heating degree-days across all three Japanese zones. El Niño conditions remain in play with Niño-3.4 at +2.10, tending to reinforce the Pacific High and extend the warm bias into the summer peak. The JP regime is flagged BENIGN, with no tripwire cleared, the degree-day path is tracking within normal variability despite the Kansai anomaly.
The demand-side read for JEPX and JKM markets is one of moderate-to-elevated cooling load, concentrated in the Kansai and Chubu zones, with Tokyo close to normal. All three zone CDD15 readings are stable from the prior run, no flip, no acceleration, which means the run-to-run signal is one of confirmation rather than a new forcing event.
Australia
The Southern Hemisphere winter pattern is asserting itself across the NEM with unusual force. All four NEM regions are showing positive HDD15 anomalies, and the ensemble is not softening: every zone is unchanged from the prior run, which signals a stable, deepening cold signal rather than a transient cold pool that models are eroding.
Victoria is the headline: HDD15 at 138.85 against a normal of 121.22, a +17.6 anomaly. This is a meaningful departure from seasonal normal and reflects a succession of northwest-tracking cold fronts crossing the Bight and sweeping across Victoria's Bass Strait corridor. The SAM index is elevated at +2.79, which shifts the westerly storm track equatorward toward southern Australia, exactly the mechanism driving the front sequence into southeastern NEM regions. A positive SAM in winter tends to deliver colder-than-normal temperatures to Victoria and South Australia while the enhanced westerlies maintain active frontal passages.
South Australia confirms the picture with HDD15 at 113.5, an anomaly of +10.8 above a normal of 102.71. New South Wales is running at 91.65, +7.4 above its normal of 84.205, which reflects the northern reach of the frontal activity and the cold air mass pooling over the ranges. Queensland is the most sheltered, with HDD15 at 44.65, +4.2 above normal, a positive but smaller anomaly consistent with the sub-tropical latitude moderating the southern cold air.
The IOD is slightly negative at -0.29, a modest signal that tends to reduce moisture advection into southeastern Australia but is not at a magnitude to reshape the pattern materially. The dominant forcing is the SAM-driven storm track, not the Indian Ocean dipole.
AEMO's NEM is operating in an elevated heating demand environment across four regions simultaneously. The grid operator's overnight periods are seeing sustained residential and commercial heating load, and the flat run-to-run reading, no zone moved, means the cold anomaly is not about to relax. AEMO dispatch price sensitivity on cold mornings and evenings in Victoria and South Australia is the demand-side implication; how gas dispatch responds to clearing heat load will be the operational variable.
What to Watch
The next ECMWF ensemble run should be watched for any shift in the SAM-driven frontal track across southeastern Australia, if the storm-track ridge backs and the SAM signal weakens, the Victoria and South Australia anomalies are the first to erode. In Japan, watch whether the Kansai CDD anomaly continues to widen relative to Tokyo in the next run: if the Pacific High extends its ridge eastward toward Kanto, the Tokyo anomaly could close the gap, broadening the cooling load uniformly across Honshu rather than concentrating it in the west.