Here’s why Europe’s heatwave is bad news for renewables - even solar

illuminem summarises for you the essential news of the day, reviewed by our editorial team. Read the full piece on Euronews or enjoy below:

🗞️ Driving the news: Europe’s heatwave has driven solar power output to record highs, causing negative electricity prices in parts of the EU
• While solar generation is peaking, meeting almost half of UK electricity demand at midday, excess supply is outstripping consumption, and heat is slightly reducing efficiency across photovoltaics and slowing wind output

🔭 The context: Negative electricity prices occur when supply exceeds demand. Grid constraints, especially for remote solar and wind farms, exacerbate the problem
• The EU’s battery storage expansion, now over 77 GWh, is insufficient to fully absorb excess renewable energy
• France, Germany, Italy, and Spain have already reported curtailed output for wind and hydro due to heat

🌍 Why it matters for the planet: The heatwave highlights the limits of renewable integration without robust grid and storage infrastructure
• Solar efficiency declines with rising temperatures, and low wind speeds and hot river water for hydro/nuclear cooling reduce renewable reliability
• Effective storage and transmission are critical to ensure climate-friendly energy is fully utilized rather than wasted

⏭️ What’s next: Europe aims to scale battery energy storage to 750 GWh by 2030 to handle surges
• Grid modernization, demand-side management, and incentives to consume excess energy (like discounted electricity) will be key to stabilizing prices and maximizing renewable use during heat events.

💬 One quote: “It’s a common misconception that more sun always equals more power. Photovoltaic cells lose efficiency as temperature rises.” – Ioanna Vergini, founder of wfy24.com

📈 One stat: Solar panel efficiency drops roughly 0.4–0.5% for every degree Celsius above 25°C.

Track the real‑world impact behind the sustainability headlines. Illuminem’s Data Hub™ offers transparent performance data and climate targets of companies driving the transition.

Click for more news covering the latest on energy transition and subscribe to our newsletter for the stories shaping the future of sustainability.