Alpine drought cuts hydropower output as northern Italy faces energy crunch

Hydroelectric reservoirs in the Alps that supply roughly a third of northern Italy's electricity have fallen to levels below the seasonal average, according to Reuters reporting on energy markets across the continent. The shortfall stems from below-normal precipitation in the high Alps during spring and early summer, a pattern consistent with broader European drought conditions that have affected water availability from the Rhone valley to the Danube basin. For Piedmont, which sits at the western end of the Alpine arc and depends on mountain-fed hydropower stations in the Aosta Valley and along the Toce and Sesia rivers, the constraint is already forcing difficult choices about power supply and pricing.

Italy's grid operator, Terna, has begun drawing down strategic reserves and increasing reliance on thermal generation and imports from France and Switzerland to maintain supply during peak demand hours, according to Reuters. The shift is visible in wholesale electricity prices, which have risen across northern Italy as hydropower's contribution has declined. Power-intensive industries in Piedmont—including aluminium smelting, metalworking, and chemicals production—have begun adjusting schedules to take advantage of lower-cost off-peak hours, a sign that energy constraints are already shaping industrial planning.

The Alpine drought reflects a wider pattern of water stress across Europe that climate scientists have linked to shifting precipitation patterns and warmer temperatures at elevation. Reuters reported that similar pressures on hydropower are affecting Switzerland, Austria, and France, all of which depend on Alpine runoff for a significant share of generation. For Italy, which has limited thermal generation capacity and imports roughly 15 percent of its electricity, the squeeze on hydropower creates vulnerability to price spikes and supply disruptions, particularly if drought conditions extend into autumn.