Five economic impacts to watch from the 2026 heatwaves

• Power – higher demand, combined with lower output. Cooling demands rose as heat reduced the output of nuclear, gas, hydro and wind generation across Europe and the US. German day-ahead electricity reached €210/MWh on 23 June, French nuclear output was cut by more than 9GW across 12 reactors, and Britain issued its first summer electricity-margin notice. By late July, low water on the Danube had forced both reactors at Romania’s Cernavodă plant offline; together they normally supply around one-fifth of the country’s electricity. Austrian utility Verbund estimated that poor hydrology reduced first-half earnings by €370m, while EDF expects 2026 EBITDA to fall by 10%, citing low prices and heat-related constraints on nuclear and hydro output. Investor capital is required for stronger grids, storage, reserve generation and plant cooling to preserve existing capacity. Then there is the political challenge to build new capacity to power energy-intensive data centres.
• Freight – falling river levels reduce industrial capacity. Cargo vessels on the Rhine were often sailing at around 20% of normal capacity to avoid grounding. Thyssenkrupp reduced blast-furnace production at Duisburg after raw-material deliveries were disrupted and suspended its own barge operations. On the Danube, grain barges were left idle and several ports became inaccessible. Freight between Rotterdam and the Rhine was running about 10% below normal by the end of July. Smaller loads require more journeys or a switch to road and rail, raising freight rates, fuel use and inventory requirements. These effects pass quickly into the price of fuel, chemicals, metals, grain and manufactured goods. Looking to the US – Mississippi freight – Lower river levels have already cut tow sizes by 13%; although the Memphis gauge should remain above its low-water threshold over August, St Louis barge rates could rise from $26 a ton towards the $53 seen in 2023—or $106 if the low waters of 2022 repeat, with September and October the key months if rainfall remains weak.
• Food – heat and drought are now affecting crop forecasts and traded prices. Britain’s wheat harvest was 54% complete by 27 July, with yields averaging 6.8 tonnes per hectare, 14% below the ten-year average. France’s maize crop may be its smallest in 50 years. Coceral cut its forecast for EU production by nearly 8% to 52.7m tonnes, the lowest since 2007. Looking globally: wheat prices have risen by about 20% since the start of the year on drought concerns in the United States, while rice prices at Southeast Asian export hubs rose by around 15% in a month as El Niño developed. JPMorgan estimates that El Niño combined with higher energy, fertiliser and packaging costs could add 0.3 percentage points to global inflation next year. Emerging markets are more exposed because food carries a larger weight in consumer spending and agriculture accounts for more employment and output.
• Labour and health – fewer hours were available for productive work. Spain allowed working hours to be reduced or shifted during severe heat alerts, while Barcelona equipped 1,400 outdoor workers with monitors requiring them to stop when body temperatures became unsafe. More than 10,000 excess deaths were recorded across Europe during the late-June heatwave, with over 9,000 among people aged 65 or above. Germany estimates that each day above 30°C costs its economy €430m in lost productivity. Employers face lower output, changed shift patterns, more sickness absence and higher cooling costs. In addition, governments face additional healthcare and income-support expenditure.
• Insurance and public finances – less cover, higher premiums. Wildfires forced about 220,000 people to evacuate in France and 100,000 in Spain. In the French camping sector, 62 sites were evacuated and cancellations extended into August, which normally accounts for around 40% of annual revenue. Swiss Re noted that national insurance pools in southern Europe often exclude wildfire losses and that global insured wildfire losses have risen by around 12% a year in real terms since 1970. Climate change made the fire weather twice as likely in south-western France and 20 times as likely in central Spain. Higher premiums, narrower cover and greater spending on firefighting, water, forest management and reconstruction transfer more risk to households, lenders and governments. More focus on land management and unpopular “firebreak burning” will be required in European and UK national parks to reduce the biomass of dry-tinder.