Saharan dust set to cut Italian solar output up to 37%, lifting day-ahead power prices
Italy faces a simultaneous supply and demand shock as desert dust crushes solar generation while a heatwave drives cooling load higher.
Italy's spot power jumped for Thursday (2026-07-16) delivery as Saharan dust hit the country, reducing solar output during the same hours that the heatwave was pushing cooling demand higher, with effects forecast to persist through the week of 2026-07-20, experts told Montel.6
Italy added significant renewable capacity under a €23bn state aid scheme cleared by the European Commission, a package aimed at adding 37.15 GW of generation from wind, solar, hydro and sewer gas. The more solar embedded in the system, the more exposed the grid becomes when atmospheric particulates turn panels into near-useless assets during peak demand hours.4
The scale of the solar hit varies sharply with cloud cover. Paolo Guerrieri, energy economist at the Paris School of International Affairs, told Montel that solar output in Italy could drop by 12-18% on Monday (2026-05-18) and Tuesday (2026-05-19), equivalent to 20-35 GWh/day. In a severe scenario with added cloud cover, the cut could reach more than 20%, or 40-50 GWh/day, he added.2
Those May figures offer a template for what traders should expect now, though the July dust event was forecast to be more intense. On the earlier occasion, analysts estimated the dust could lift Italian day-ahead power prices by EUR 4-15/MWh, a range reflecting the uncertainty in dust-load modelling and its interaction with the concurrent heatwave.2
Dust events hit supply and demand simultaneously, in the same direction. Solar collapses while air-conditioning load climbs, so the gap must be filled by gas-fired generation, hydro where available, or imports from neighbours that are equally under heat stress. That is a direct gas-burn signal.6,2
EU gas demand has fallen roughly 10% this year compared with previous years, a trend that has capped prices despite the storage build. But heatwaves can reverse that trend quickly, and dust events compound the effect by forcing gas-fired plant to cover generation that solar would otherwise have provided.3
The European carbon market adds a second layer. Lower solar output pushes more gas into the generation mix, raising demand for emissions allowances. Analysts have cut EU carbon price forecasts for the next two years on policy uncertainty, reported Reuters, but short-term weather-driven gas burn can still move the ICE EUA Dec-rolling contract on days when the Italian grid is genuinely tight.5
Italy's market structure amplifies the price response. Analysts told Montel during the week of 2026-08-17 that Rome should reclaim control of its decentralised power system as a way of curbing soaring energy prices, with some calling for a national emergency declaration. The dust event is a live demonstration of why: a high-renewable grid with limited dispatchable backup has less cushion against supply shocks.7
The government is simultaneously negotiating an ETS reform proposal with the European Commission, with almost daily exchanges underway, a government source told Montel. The source said there has been no negative feedback so far, and that the Clean Industrial Deal State Aid Framework appeared to allow for case-by-case assessment and faster procedures.1
Analysts have warned the reform could clash with the EU's updated state aid framework, a risk that sits directly above the €23bn renewables package already approved. If Rome's carbon-market changes undercut the economics of the new capacity, the system loses some of the flexibility needed to absorb dust events without sustained price spikes.1,4
France, by contrast, has capped the price of gas at last year's level and power just 4% higher, a policy choice that shifts the burden of scarcity onto Italy's more market-exposed consumers.3
The day-to-day read from traders is that the dust cuts are a short-term problem, not a structural one. Gas storage is building and EU demand is down year-on-year. The duration of the heatwave beyond the week of 2026-07-20 is what matters: if temperatures hold, the dust event becomes the opening act of a longer, more expensive summer for Italian power buyers. Italian day-ahead prices will be the tell — if they hold above the analysts' EUR 15/MWh upper bound for multiple consecutive days, the forecast has become the market reality.6,32