04/19/2026
Spain just completed its largest ever solar installation — a 3,000 megawatt farm in the Extremadura region that generates so much electricity during peak midday hours that it supplies the entire national grid for free, pushing electricity prices to zero or even negative values during sunny afternoons.
The Solaria Extremadura complex covers 6,000 hectares of dry Extremadura plateau with 7 million bifacial solar panels on single-axis tracking systems that rotate east to west following the sun precisely throughout the day. Located in one of Europe's sunniest regions receiving 3,000 hours of sunshine annually, the farm operates at full rated capacity for over 6 hours daily during summer months. Peak generation at midday exceeds Spanish base electricity demand, flooding the national grid with clean power that conventional gas and coal plants cannot compete with economically, triggering their automatic shutdown during solar peak hours.
Spain's electricity market already recorded 1,847 hours in 2024 when wholesale electricity prices fell to zero or below zero, paid consumers to use electricity because renewable generation exceeded demand. The Extremadura farm accelerates this trend dramatically, projecting 3,200 zero-price hours annually by 2026 — meaning Spanish industry will effectively receive free electricity for 37% of all daytime hours.
The farm connects to Portugal and France through international interconnectors, exporting surplus solar electricity across borders during peak generation and receiving conventional power at night, making Spain a net clean energy exporter to neighboring European countries for the first time in its history.
Source: Solaria Energía y Medio Ambiente Spain, Red Eléctrica de España, 2025