TTF Surges Nearly 7% as Heatwave and Storage Shortfall Drive European Power Higher
A gas storage gap well below seasonal norms is amplifying summer heat-driven price spikes across European day-ahead power markets.
ICE Endex TTF front-month gas surged 6.78% to €55.74 per megawatt-hour as of Thursday (2026-08-06), a sharp single-session move that pulled European power prices sharply upward. German power settled at €131.16/MWh, a 5.15% gain on the session, while THE M+1 climbed 6.53% to €56.35/MWh. [live prices]
European gas prices set the marginal cost of power generation across most of the continent, and with storage running well below last year's levels, there is little room for the market to absorb weeks of sustained heat demand. The Nord Pool day-ahead complex is exposed on both sides: gas prices up, wind down.2
EU storage stood at approximately 28% — around 314 TWh, or 29 billion cubic metres — as of April 1, 2026, well below the levels recorded in each of the preceding three years, according to GIE data. Europe's LNG regasification capacity of roughly 1,600 TWh per year provides structural headroom, but competitive global demand for cargoes and constrained injection rates keep the supply gap wide.2
Vattenfall CEO Anna Borg told Montel on Friday (2026-07-17) that refilling European gas stores ahead of winter would cost more than desirable, and that cost would feed through into power prices over the heating season.7
Heatwave-driven spikes have already hit European day-ahead markets this summer. Germany's day-ahead prices jumped 29% on Wednesday (2026-05-27) as a European heatwave lifted cooling demand while wind generation dropped, LSEG data cited by Reuters showed. Wind output was expected to fall to 4.4 GW on Thursday (2026-05-28) from 9.7 GW on Wednesday (2026-05-27), while non-renewable load was set to rise 8.2 GW to 23.5 GW in the same period, the data showed.4
Flexibility is thin elsewhere. Spot prices in Denmark and other European markets surged during the week of June 22 (week of 2026-06-22), Montel reported, with a market expert at Green Power Denmark saying the spikes showed the power system lacks sufficient flexibility when wind runs low.5
Britain faced comparable pressure in early July. The National Energy System Operator issued a rare overnight warning during the heatwave week of July 6 (week of 2026-07-06), alerting that extreme temperatures could stress the grid on Thursday (2026-07-09) night as household demand from fans and air conditioning placed what it described as record overnight strain on the system.6
Not every signal aligns with the rally. Contrarian positioning on German baseload front-month has turned bearish on the weather driver, suggesting some traders expect temperatures to moderate and wind to recover, taking pressure off gas-fired generation.
Germany's wind expansion gives some basis for that view. The country added an estimated 5 GW of turbines in 2025, pushing wind generation up 27% in the first quarter of 2026 compared with a year earlier, IWR analysis showed in April.4 Power prices fell 8.9% in the first half of the year as that capacity came online. But summer heat domes cut wind output precisely when marginal costs are highest, limiting the hedge.4
Industry experts had flagged this dynamic early. Participants in the European power market told Montel on Thursday (2026-05-21) that gas uncertainty and heatwave risk amplified by the El Niño weather pattern would keep power prices volatile well into the summer months, with gas expected to remain the dominant price-setting fuel.1
British day-ahead electricity prices rose nearly 19% to £475 per megawatt-hour on Wednesday (2026-05-13), Reuters reported, during an earlier period of European energy strain.3 How quickly European storage recovers through August will shape the baseline that Nord Pool day-ahead and other forward markets carry into winter.2