Spain’s electricity sector is coming under increasing pressure as the operational availability of gas-fired power stations declines, despite their growing role in maintaining grid stability, particularly in the aftermath of the widespread blackout that affected the Iberian Peninsula on April 28, 2025.
Energy sector data show that approximately 10 gigawatts of the 25 gigawatts of installed combined-cycle generation capacity are either offline or unavailable for operation, representing around 40% of the total. The figures raise concerns over the ability of these facilities to meet growing demands from the national electricity system.
The decline in availability is largely linked to the intensified use of gas-fired plants following the blackout. Since then, the grid operator has relied more heavily on combined-cycle facilities to manage fluctuations, regulate voltage levels and maintain the balance between electricity generation and demand.
Industry representatives have warned that repeatedly starting up and shutting down these plants throughout the day places additional stress on their equipment, accelerates component deterioration and increases maintenance requirements. Such conditions could lead to more frequent technical failures and extended periods of downtime.
To address these challenges, the grid operator is reviewing planned maintenance schedules for several generating units, seeking to reduce periods of unavailability and preserve sufficient generation capacity to meet electricity demand.
Meanwhile, the contribution of combined-cycle power stations to electricity generation across the Iberian Peninsula has climbed from around 8% to 19.4%, according to figures reported by economic media outlets. This increase highlights the expanding importance of natural gas within Spain’s electricity generation mix.
The situation underscores the difficult balance facing Spain as it continues to expand renewable energy while maintaining flexible conventional power sources capable of compensating for fluctuations in renewable generation, safeguarding grid stability and reducing the risk of widespread power outages.
