Ljubljana: Renewable energy now provides half of all the electricity generated in the European Union, a milestone confirmed in the latest monitoring report from the bloc’s energy regulators’ agency. The achievement, the product of years of investment and political will, comes wrapped in a warning: the same clean-power boom that is decarbonising the grid is also making electricity prices swing more violently than at any point in recent memory.
The numbers behind the milestone are striking. Renewables supplied half of the bloc’s power last year, and solar led the charge, with generation rising sharply as new capacity came online. On its face this is exactly the transition policymakers have promised, cheaper, cleaner electrons displacing fossil fuels. But the agency’s analysts found that daily wholesale price swings were roughly five times larger than they were at the start of the decade, a side effect of leaning so heavily on a source that pours out power when the sun shines and vanishes when it sets.
The mechanism is straightforward and increasingly familiar to anyone who watches energy markets. When solar floods the grid at midday, prices can collapse, sometimes below zero, as supply overwhelms demand. As the sun fades and households switch on lights and appliances in the evening, prices spike to cover the gap. The gulf between those midday troughs and evening peaks has widened into a chasm, and that volatility carries real costs, deterring investment, complicating bills and straining a grid built for a steadier era.
The agency’s prescription is flexibility, the unglamorous companion to clean generation. It urges a faster rollout of demand response, the practice of nudging consumption toward the hours when power is cheap and plentiful, alongside a rapid build-out of storage. Batteries, electric vehicles that can feed power back to the grid and other tools that shift supply across the day are, in the regulators’ view, the missing half of the transition. Building the panels and turbines turns out to be the easier task; learning to absorb and time-shift what they produce is the harder one.
There is a geopolitical shadow over the report as well. The relative calm of recent months, the analysts caution, is already being tested by shocks early this year, a reminder that Europe’s energy security still hinges on events far beyond its control. Even a grid running half on home-grown renewables remains exposed to the price of imported gas, which often sets the marginal cost of electricity, and to the political turbulence that moves those markets.
The broader message is that the transition has entered a new and more demanding phase. The first task, generating enough clean power, is being met. The second, managing a system whose output is dictated by weather and daylight, has only begun. Without a serious investment in flexibility, the regulators warn, the very success of solar and wind could undermine confidence in the market that is supposed to deliver them. Half of Europe’s power is now clean. Keeping it affordable and reliable is the work that remains.
