Solargis, a Slovakia-based solar data and software firm, compared this summer's solar irradiation with historical baselines and found sharp deviations tied to more frequent extreme weather. That volatility raises forecasting difficulty for wind and solar output, which in turn can unsettle investors who set return targets using past models and grid operators that count on variable renewables.
The company's takeaway is not that renewables are broken, but that risk management needs to evolve. More detailed weather information is increasingly essential to hedge exposure and keep supply and demand balanced. It is no coincidence hedge funds such as Jane Street Group LLC and Millennium Management LLC have been bringing weather specialists on board in recent years.
Solargis Chief Executive Officer Marcel Suri put it plainly: "Summer 2026 has demonstrated the extent to which solar resource conditions can diverge from historical averages across major markets."
Western Europe logged a summer that ranks among its hottest and least rainy on record, and it showed. Southern England and western France came in at more than 20% above their normal solar irradiance. In Southeast Asia, Malaysia, Indonesia and the southern Philippines also punched well above trend, around 30% higher than historical levels.
The flip side: eastern India, hit hard by monsoon rains, saw irradiation as much as 20% below average. Fortunately for India's build-out, most solar projects are concentrated in India's west and north, and those areas experienced average or above-average conditions. Parts of the U.S. Midwest also recorded notable deficits.
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Northern Europe faced shortfalls up to 25% below norms, linked to higher than usual precipitation. And in Southern South America, southern Brazil, northern Argentina and Uruguay all registered irradiation more than 20% under average.
The analysis includes regional maps comparing this summer's irradiation with long-term norms, including a dedicated view for India, all credited to Solargis. The drivers range from cloud cover and monsoon patterns to smog and wildfires, all of which can swing how much sunlight actually reaches panels on the ground.
If you own anything tied to renewable generation, the headline here is simple: weather is moving the goalposts faster than historical datasets can keep up. That can shift cash flows, stress grid planning and make "average year" assumptions feel a lot less average. Watching how operators and investors adapt with better data and hedging will matter for the reliability of returns, not just the reliability of the grid.
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