Negative Power Prices Double in Iberia, France and Greece as Renewables Outrun Demand
Spain logged 842 hours at or below zero in the first half, up 39% year on year, as solar buildout outpaces load and storage lags.
Negative power prices in Iberia, France and Greece roughly doubled year on year in the first half of 2026, Montel reported on Tuesday (2026-07-08), with Spain already recording more sub-zero hours to the end of June than in all of 2025.6
That is a market symptom worth pricing, not a curiosity. Spain saw 842 hours of power at zero or below in the January-June window, up 39% on the same period last year, according to Montel EnAppSys data. When a benchmark power market spends the equivalent of more than a month of hours giving electricity away, the economics of unhedged solar and must-run thermal generation start to bend.6
The driver is not subtle. Renewable capacity, solar in particular, is growing faster than demand across southern Europe, pushing midday supply past what the grid can absorb. "Spain is the best example of what happens when renewable capacity grows much faster than demand," a Montel EnAppSys analyst said.6
The pattern is regional now, not German-specific. On Sunday (2026-05-17), European markets hit record lows near EUR -500/MWh, with Germany, France and Hungary all printing intraday prices below EUR -400/MWh as renewable output surged into muted weekend demand.1 The May episode was an extreme; the H1 data shows the milder version has become routine.6
Germany remains the reference case for how far this goes. The country has spent roughly $200 billion over two decades promoting cleaner power, and negative prices there have shifted from anomaly to a recurring feature of the merit order.3 What has changed in 2026 is that Iberia and France, long insulated by nuclear baseload and interconnection, are converging on the same profile.6
The fix that traders keep circling back to is storage. Analysts told Montel in the week of 2026-05-11 that batteries could blunt the negative-price trend, but that "dozens of GW" of units would be needed to make a dent — capacity that is not yet built.5 Until that arrives, midday oversupply has nowhere to go except into negative clearing prices or curtailment.5
Grid infrastructure is the other bottleneck. EU regulator Acer has pressed southeast European TSOs to speed up grid upgrades, strengthen cross-border coordination and apply EU market rules, warning that weak interconnection leaves the region exposed.2 Thin transmission cuts both ways: it traps cheap renewable power in one zone while leaving neighbours short, so the same underbuilt grid that produces price spikes in scarcity produces negative prints in surplus.2
For power traders the read is a widening intraday and locational spread, not a directional collapse in the curve. Front-year contracts have been pulled higher by gas and carbon even as spot midday hours crater. British day-ahead prices rose nearly 19% to reach £475/MWh on Wednesday (2026-05-13), Reuters reported, and benchmark French and German power contracts had both doubled from January.4 The value is migrating out of flat baseload and into shape — the ability to move energy across hours.4
That is where the gas and carbon side still matters. TTF front-month sat near EUR 49/MWh as of Saturday's (2026-07-11) reference, and EU carbon remains firm, keeping evening and morning peak hours expensive even as solar hours go free.4 The European carbon chain still runs through gas: TTF sets the switching level, which sets the generation mix, which sets EUA demand. Negative midday prices do nothing to loosen that when the sun is down.4
There is a bearish tail here that positioning does not fully reflect. As solar penetration climbs, the number of hours where thermal plants earn nothing grows, pressuring the merit-order economics that underpin baseload forwards and, over time, thermal availability.6 The German baseload contract carries a modest bearish signal against an otherwise bullish complex, and the H1 negative-price data is the fundamental behind it.5
Watch three things into the second half. Whether Spain's sub-zero hour count keeps accelerating past its 2025 full-year total, whether any of the promised battery gigawatts actually connect before next spring's solar peak, and whether Acer's grid warnings translate into approvals rather than reports.6,52 The renewables are already built. The system to absorb them is not.