Spain installed 1.14 GW of solar capacity for self-use in 2025, bringing the cumulative capacity to 9.3 GW, as residential and commercial installations declined while the industrial and off-grid segments showed greater resilience, according to data from the Spanish Photovoltaic Union.
According to data from the Spanish Photovoltaic Union (UNEF), solar self-consumption capacity in Spain reached a cumulative 9.3 GW in 2025.
Spain added 1,139 MW of new self-consumption capacity during the year, representing a slowdown of 3.7% compared to 2024. According to UNEF, the slowdown signals a phase of market stabilization after several years of rapid growth.
The residential segment accounted for 229 MW across 36,330 new installations, a year-on-year decline of 17%. UNEF attributed the contraction to the phasing out of tax incentives linked to energy-efficient home renovations and lower compensation for excess electricity exported to the grid under deregulated market contracts.
UNEF said falling prices for surplus compensation reduce the attractiveness of oversized systems designed primarily for grid injection. As a result, demand is shifting to installations optimized for immediate self-consumption. The association calls for a revision of the simplified regulated compensation mechanism to enable broader settlement of excess energy and improve economic signals for small-scale systems.
The commercial segment installed 176 MW in 2025, a decrease of 15% from the previous year. Collective self-consumption remains limited despite its potential to optimize shared generation and demand. Industry representatives said future regulatory updates are needed to enable aggregated management models, dynamic energy allocation and an expansion of eligible areas for self-consumption.
Self-consumption industrial installations totaled 679 MW, which represents a slight increase compared to 2024. UNEF said growth in this segment is driven by larger medium-voltage systems aimed at reducing electricity costs and partially covering electrified thermal demand. The viability of projects increasingly depends on tariff structures with a higher variable component and more streamlined permitting for medium-sized installations.
Off-grid installations reached 55 MW in 2025, reflecting the growing adoption of hybrid solar-plus-storage systems in rural areas and locations without access to the electricity grid. Battery integration into grid-connected installations also continued to increase, improving controllability of generation and supporting system flexibility.
UNEF said Spain will need to deploy an average of around 2 GW of self-consumption capacity per year to meet the 19 GW target set in the country’s National Integrated Energy and Climate Plan. Reaching that level requires regulatory stability, administrative simplification and more effective integration of distributed energy storage.
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