Self-consumption of photovoltaic (PV) energy in Spain has established itself as a structural driver of the energy transition, even though the sector has faced three consecutive years of contraction and is currently lagging behind the pace required to meet the targets of the National Integrated Energy and Climate Plan (PNIEC). This is according to the fourth edition of the Annual Report on Self-Consumption of Photovoltaics and Storage 2025, prepared by APPA Renovables.

In 2025, 1,214 MW of new self-consumption capacity was installed, comprising 846 MW in the industrial and commercial segment and 368 MW in the residential segment. Specifically, there were 66,909 residential installations and 4,700 industrial installations, with average capacities of 5.5 kW and 180 kW, respectively.

This brings total installed self-consumption capacity to 9,590 MW, equivalent to approximately 24% of Spain’s annual peak electricity demand (around 40 GW). In energy terms, these installations delivered 10,550 GWh during the year, representing 4.1% of national electricity demand.

However, the report identifies an additional 2,183 GWh of untapped generation due to network limitations and operational constraints, which would raise potential contribution to 5% of demand. This gap highlights a structural issue linked to grid integration capacity and insufficient regulatory tools, rather than technological limitations. The energy not fed into the grid in 2025 is estimated to have an economic value of €82 million, underscoring the need to optimize grid access and utilization, including effective use of the 10% of capacity reserved for self-consumption in distribution networks.

Economic and Payback Metrics

The report estimates average savings in 2025 at €189/kW for residential installations and €133/kW for business installations, influenced by hourly consumption patterns, the share of renewables in the energy mix, and average electricity market prices. Typical payback periods are 6–7 years for a 5.5 kW residential installation and 5–6 years for a 180 kW industrial installation, excluding additional tax incentives.

Storage: Accelerated Growth

Energy storage associated with self-consumption was a major growth driver in 2025. 339 MWh of batteries were installed – a 119% increase over 2024 – across residential, commercial, and industrial sectors. The residential sector installed 158 MWh, and the commercial/industrial sector 181 MWh. By sector, battery installations increased 155% in residential and 95% in commercial/industrial.

Storage is no longer a complementary element; it has become strategic for managing peak demand, optimizing self-consumed energy, enhancing operational resilience, and supporting industrial electrification in areas with network constraints.

Planning Deficit: Absence of an Integrated National Registry

Despite nearly 10 GW installed, Spain still lacks a fully operational, standardized, and up-to-date National Self-Consumption Registry that integrates storage facilities. This limitation reduces visibility of distributed generation, complicates system planning, and constrains operational foresight amid rising renewable penetration.

Taxation and Next Generation Funds

APPA Renovables emphasizes that sector recovery requires stable fiscal measures, including: reinstatement of tax deductions on Personal Income Tax (IRPF) or Corporate Income Tax of at least 25% of installation costs and accelerated depreciation for electrification and energy efficiency investments. These tools are critical for sustaining household and SME investment, stimulating demand, and preventing further contraction.

The sector also calls for administrative simplification, improved grid access, effective mechanisms for managing surpluses, and regulatory signals enabling self-consumption and storage to fully contribute flexibility to the electricity system.

The report warns of the Next Generation EU fund disbursement risk, with an average payout of only 40% nationwide. Without extended deadlines and streamlined administration, these funds – crucial to record installation figures in 2022–2023 – could erode investor confidence.

Overall, self-consumption is consolidating as a structural component of Spain’s electricity system, demonstrating tangible benefits in generation, savings, and competitiveness. Its future contribution will depend on fiscal stability, enhanced grid integration, and regulatory planning aligned with the growing role of distributed generation and behind-the-meter storage.