Valencia: Keeping the lights on has a price, and Madrid has just won Brussels’ blessing to pay it. On 29 May the European Commission approved, under the Union’s state-aid rules, a Spanish scheme worth up to 9 billion euro designed to guarantee that enough electricity-generating capacity is available when the country needs it most. The decision is one of the first big tests of a new rulebook that is supposed to reconcile two goals that often pull against each other: subsidising security of supply while protecting fair competition in the single market. The mechanism is what energy specialists call a capacity market. Rather than paying only for the power that plants actually produce, it pays generators and, increasingly, providers of demand flexibility and storage to stand ready, holding capacity in reserve so the grid does not buckle during a still, cold evening when wind and solar fall short. As Spain leans ever harder on renewables, those windless gaps become the system’s weak point, and a capacity payment is the insurance premium against blackouts. What makes this approval notable is the yardstick the Commission used. Officials judged the Spanish design to be broadly aligned with the best practices of the bloc’s new Clean Industrial State Aid Framework, the streamlined regime rolled out to speed public support for the green transition while keeping distortions in check. The framework is meant to let governments act faster on energy and decarbonisation without each scheme becoming a years-long negotiation. Spain’s clearance signals that the new template can move a multi-billion-euro programme through the process at workable speed. State-aid control sits at the heart of the Commission’s identity as the referee of the single market. Left unchecked, national subsidies let deep-pocketed governments tilt the playing field, rewarding their own champions and punishing rivals across the border. The capacity-market question is especially delicate because almost every member state faces the same reliability worry, and a patchwork of generous, badly designed schemes could fragment the very electricity market the Union has spent two decades stitching together. By insisting that the Spanish mechanism be technology-neutral and open, rather than a covert lifeline for ageing fossil plants, the Commission is trying to thread that needle. The approval allows payments to flow to a range of capacity providers competing to offer the cheapest reliability, which in theory holds down the cost passed to consumers and keeps the door open to batteries and demand response rather than locking in old gas. For Spanish households and industry, the practical promise is fewer worries about supply as coal and older plants retire. For the rest of the Union, the decision is a marker of how the Commission intends to police the coming wave of energy subsidies: not by saying no, but by demanding that the design serve the wider market rather than quietly carve it up.