Spain Rooftop Solar - Market Share Analysis, Industry Trends & Statistics, Growth Forecasts (2026 - 2031)

According to Mordor Intelligence, the Spain rooftop solar market size in terms of installed base is projected to be 9.32 gigawatt in 2025, 10.37 gigawatt in 2026, and reach 15.42 gigawatt by 2031, growing at a CAGR of 8.26% from 2026 to 2031.

This report is Segmented by Capacity Range (Up To 10 KW, 10 To 100 KW, and Above 100 KW), Installation Type (New-Build and Retrofit), and End-Use (Residential, Commercial, Industrial). The Market Sizes and Forecasts are Provided in Terms of Installed Capacity (GW).

Spain Rooftop Solar Market Trends and Insights

Net-metering expansion & surplus compensation scheme

Royal Decree 244/2019 eliminated the "sun tax," allowing prosumers to credit excess power at retail rates, a windfall for multi-megawatt industrial arrays that routinely over-generate on weekends. The law also green-lights collective self-consumption within 2,000 m, enabling factory clusters to pool rooftops and share one grid interconnection. Industrial taxpayers turbo-charge returns through accelerated depreciation, lifting internal rates of return even before energy savings kick in. These mechanisms helped self-consumption capacity overtake nuclear in 2023, with 7,154 MW online versus 7,117 MW for reactors, most of it sitting on factory roofs.

Declining module & BOS costs

Panel prices slid 17% in 2023, and large orders for 600-W modules now clear customs for as little as USD 0.17/W. Commercial-grade inverters and aluminum racking fell in tandem, pulling the levelized cost of industrial rooftop electricity down to USD 0.044/kWh, on par with ground-mount projects. Spain's inverter plants, rated at 82.1 GW per year, shield supply chains from freight shocks and let EPC firms lock in fixed-price contracts despite global volatility. A EUR 750 million (USD 825 million) manufacturing grant further anchors component sourcing at home.

Grid-interactive smart-inverter mandate

Town-hall approval for a 2 MW Barcelona retrofit can exceed 14 months, as planners juggle fire-safety reports, structural affidavits, and visual-impact statements. Brussels warned Spain that such delays jeopardize REPowerEU milestones. Girona's seven-year saga to clear a mid-scale plant frightened risk-averse industrial CFOs, adding soft costs equal to 6% of total project spend.

Other drivers and restraints analyzed in the detailed report include:

1. Corporate sustainability & PPAs proliferation
2. EU Green Deal funds allocation
3. Scarce skilled rooftop-installer workforce

For complete list of drivers and restraints, kindly check the Table Of Contents.

Segment Analysis

Spain's solar rooftop market size for arrays above 100 kW reached 5.76 GW in 2025, equal to 61.8% of total installed capacity. Within this cohort, multi-megawatt industrial roofs are logging 11.1% CAGR on the back of bulk component pricing and single interconnection fees that dilute per-kilowatt soft costs. The Spain solar rooftop market size for 10-100 kW projects stood at 2.41 GW, addressing warehouses and supermarkets that value net-metering without three-year grid studies.

Economies of scale slash installed outlays to EUR 0.68/W for 5-MW rooftops, 34% below residential benchmarks. Overdimensioning modules to inverter ratings boosts yield without extra BOS hardware. Meanwhile, under-10 kW systems lose share as subsidy caps shrink, though they remain vital in suburban feed-in clusters. Continual smart-inverter firmware updates let >100 kW systems offer voltage ride-through and synthetic inertia, turning factory roofs into microgrids that double as grid assets during contingency events.

Complete Report Scope:

• By Capacity Range
  • Up to 10 kW
  • 10 to 100 kW
  • Above 100 kW
• By Installation Type
  • New-build
  • Retrofit
• By End-use
  • Residential
  • Commercial
  • Industrial

List of Companies Covered in this Report:

1. Acciona SA
2. Iberdrola SA
3. Endesa SA
4. Repsol SA
5. X-ELIO Energy
6. Solaria Energia y Medio Ambiente SA
7. Clidom SA
8. Exiom Solution SA
9. Soltec Energias Renovables SL
10. Gransolar Group
11. Avenir Energia
12. SunPower Corp.
13. SotySolar
14. SMA Solar Technology AG
15. REC Group
16. Solarpack Corporacion Tecnologica SA
17. Zelestra
18. Gestamp Solar (Univergy/Grenergy)
19. Grupotec Servicios de Ingenieria SL
20. Zytech Solar

Additional Benefits:

• The market estimate (ME) sheet in Excel format
• 3 months of analyst support