Spain offers 3,000+ hours of sunshine per year, making solar energy a smart investment for property owners. From installation costs and self-consumption laws to battery storage and IBI tax deductions, here's everything UK buyers need to know. MUNDO Research Team · Vetted by Costa del Sol property. Spain solar panels 2026: €1,400–€1,800/kWp, IDAE grants up to 40%, 5–13 year payback. Full guide with regional subsidies, net metering, and comunidad solar. IDAE grants cover up to 40% of costs (60–80% for vulnerable households). A 5 kWh battery typically costs around €4,000-5,000. But if you are considering solar for your home, you probably have lots of questions: How much do solar.