Key facts
- Spain has invested over €70 billion in clean energy in the last 15 years, with renewables forming 75% of its electricity mix.
- Reports indicate a surplus of solar power is devaluing solar farms and leading some investors to sell assets.
- Spain experienced a significant spike in negative electricity prices, reaching 397 hours in early 2025.
- Unlike some markets, Spain does not legally compensate generators for output reductions to prevent grid overload.
- Solutions proposed include market reforms like price floors and ceilings, and increased investment in battery storage.
Spain's significant investment in renewable energy, particularly solar power, is facing scrutiny due to concerns that an oversupply of electricity is devaluing solar farms and deterring investors. While renewables have shielded Spanish consumers from volatile fossil fuel prices, leading to some of the cheapest electricity in Europe, the low prices are impacting the profitability of solar projects.
Reports indicate that a glut of solar power has led to a surge in negative electricity prices, where generators must pay to put electricity on the grid. This is exacerbated by Spain's market rules, which do not obligate grid operators to compensate generators for curtailment, unlike in some other European countries. The solar photovoltaic sector argues that the current market mechanisms are not suited for technologies with near-zero marginal costs.
To address these challenges, proposed solutions include implementing a price floor and ceiling, similar to the "Iberian exception" used in 2022, to ensure adequate returns for renewable generators. Additionally, there is a strong push for increased investment in battery storage, which can store excess solar energy produced during the day for use during peak evening demand. Battery costs have significantly decreased, making this a more viable option, and the EU has provided state aid to support such investments in Spain. Experts believe that future solar projects will need to incorporate battery storage to remain viable.