Asia Demand Note, Thursday, July 09, 2026
Japan's western and central zones are running cooling degree-day anomalies more than 19 above normal, with the HEAT_SURGE classification active and a Nino3.4 reading of +2.00 amplifying the summer heat setup.
Japan
The Pacific High is pressing firmly into central and western Honshu. Chubu's 15-day cooling degree-day accumulation has reached 154.55 against a normal of 132.28, an anomaly of +22.3. Kansai is close behind at 161.4 versus a normal of 141.96, an anomaly of +19.4. Tokyo's deviation is more moderate: CDD15 at 145.35 versus a normal of 132.63, an anomaly of +12.7. The heat centre of gravity sits west and south of the capital, in the industrial and residential belts of the Nagoya and Osaka-Kobe corridors. In aggregate, the grid-weighted 15-day CDD anomaly is running at +16.6, the level that triggers the HEAT_SURGE classification.
The El Nino signal reinforces the heat setup. The Nino3.4 index stands at +2.00, well above the +0.5 threshold for active El Nino conditions. In northern hemisphere summer, El Nino amplifies the Western Pacific subtropical high, which steers warm maritime air over Japan and suppresses the rainfall that would otherwise break heat episodes down. The Arctic Oscillation is positive at +1.23; in mid-summer, a positive AO tends to leave Japan exposed to extended ridging with limited trough development, which prolongs the heat signal rather than interrupting it.
All three zones record zero heating degree-days, consistent with the normal mid-July suspension of space heating across Japan. The grid risk is entirely on the cooling side. The Chubu and Kansai anomalies, both above +19 degree-days over 15 days, point to above-normal power demand through the central Honshu industrial corridor and the Kansai metropolitan area. These are markets where sustained heat that holds overnight temperatures above the threshold for air conditioning to shut off produces cumulative load well above what a normal summer baseline assumes. The 18:00–21:00 JST evening peak hours carry the highest exposure, when residential and commercial buildings are still radiating absorbed daytime heat.
Australia
The NEM's winter demand picture for July 9 (2026-07-09) is significantly calmer. The AU regime is BENIGN: no degree-day tripwire has been crossed. Within that benign headline, the regional dispersion is notable.
Victoria and South Australia, the two regions with the highest import dependency and the greatest exposure to wind intermittency, are both tracking below their normal heating degree-day accumulations. Victoria sits at HDD15 of 113.6, against a normal of 119.95, an anomaly of -6.4. South Australia is at 90.65 versus a normal of 100.87, an anomaly of -10.2. Both are mild for the calendar date, which means gas and coal-fired thermal dispatch in the southern NEM is not being driven by unusual heating demand. The demand-side signal is actually softer than seasonal norms would imply.
New South Wales is running slightly above normal at HDD15 of 85.55, against a normal of 84.015, an anomaly of +1.5. Queensland is tracking more noticeably above normal at HDD15 of 44.8 versus a normal of 40.295, an anomaly of +4.5. Neither deviation is large enough to place significant stress on the system, but Queensland is the region where winter cold events are running at the upper end of expectations.
The teleconnection backdrop is mixed across the Australian zones. The SAM index at +2.79 is strongly positive, which in southern hemisphere winter tends to displace the westerly storm track southward and moderate temperatures in Victoria and South Australia, consistent with the below-normal heating anomalies in those two zones. The IOD at -0.33 is weakly negative, tilting the moisture gradient toward southeastern Australia, but at this magnitude it has limited direct influence on the 15-day heating profile. The Nino3.4 at +2.00 has modest direct impact on Australian winter demand in the immediate term; its more significant AU pathway in the coming months will be through drying and warming in Queensland and New South Wales as the El Nino-influenced spring approaches.
What to Watch
For Japan, the overnight ECMWF model run for the Chubu-Kansai corridor is the next signal to track. If the +22-degree-day CDD anomaly in Chubu holds into the next 15-day window, the cumulative gap between actual and planned summer cooling load will continue to widen. The evening peak in JEPX's central regional market is where that heat deviation would show most directly.
For Australia, the demand data offers little warning of supply-side stress: the below-normal heating in VIC and SA means load is not the risk driver. Wind availability in the southern NEM over the next 48 hours carries the primary signal for those watching the interaction between intermittent generation and frequency ancillary service markets.