In Spain the debate over the impact of a lack of storage in the electricity system is intensifying in late September 2026. High solar production at midday meets limited flexibility, leading to very low or even negative wholesale prices. This is putting small and medium-sized operators of photovoltaicsfacilities under economic pressure, because revenues are lost during key hours and hedging is often unavailable.
The government points to recent steps to counter the problem. The Ministry for the Ecological Transition and the Demographic Challenge (MITECO) presented a package of measures in summer 2026. The key elements include a capacity market to remunerate firm capacity, targeted support schemes for storage, and regulatory changes intended to reward flexibility and shifting demand. The aim is to Security of supply to strengthen it into the next decade and improve investment signals for storage technologies.
Industry reports and market analyses describe a growing mismatch between solar generation and demand patterns. Photovoltaic power feeds large volumes into the grid mainly at midday, while consumption rises in the evening, when other generators or storage are needed. When storage is insufficient, prices come under downward pressure; when feed-in is high, there are more negative hourly prices. As a result, finance executives at affected companies report strained liquidity and, in some cases, initiated or impending insolvency proceedings.
The interests at stake are complex. Generators are calling for reliable revenue streams for flexibility and faster grid connections for storage. Industry and commerce are seeking incentives for self-consumption and for shifting energy-intensive processes to periods of surplus electricity. Grid and market operators stress that, alongside storage, demand response, dispatchable generation and grid expansion will remain necessary to ensure system stability and security of supply.
Officially announced measures such as the capacity market and additional support programmes are changing the framework, but their effectiveness depends on how they are designed and how quickly they are implemented. Transparent auctions, bankable contract terms and clear rules on participation and availability are crucial. Observers also point out that complementary measures—such as a faster permitting process for battery storage, more precise grid-charging arrangements and better price signals in shorter market periods—could make it easier to integrate flexibility.
Spain has a growing renewable capacity, but market design must cushion the resulting price fluctuations. Whether the announced reforms will significantly reduce negative price spikes and stabilise investment in photovoltaics and storage will only become clear with the first auctions and the roll-out of new projects.
Editor: Daniel Mayer (Article created with AI assistance).