León has turned its municipal buildings into a single shared energy network, saving over €620,000 annually, cutting 860 tonnes of CO₂, and proving that collective solar power works at city scale.
FROM ENERGY DEPENDENCE TO ENERGY SOVEREIGNTY
Facing rising electricity costs and growing pressure to reduce emissions, the City Council of León launched an ambitious solar energy initiative based on collective self-consumption. The project includes 11 photovoltaic systems installed on municipal buildings, 10 of which incorporate energy storage, with intelligent energy management connecting more than 100 consumption points. For a city of León's size, this is a remarkable level of ambition: rather than isolated installations, the entire municipal infrastructure is brought together into one shared, intelligent energy network built around the principle of energy sovereignty.
WHEN THE GRID FAILS, LEÓN KEEPS RUNNING
Sports facilities, civic centres, the congress centre, and other public buildings now generate, store, and share renewable energy through a single integrated network. By combining collective self-consumption with storage at municipal scale, the project optimises available resources and adapts to real-time energy demands. Crucially, the system strengthens the resilience of essential infrastructure, ensuring critical services continue to operate safely during blackouts, natural disasters, energy crises, and price shocks - a level of preparedness that few cities of this scale have achieved.
SAVINGS, EMISSIONS AND A MODEL FOR OTHER CITIES
The project delivers significant economic, environmental, and social benefits. Annual energy savings exceed €620,000, reducing costs for taxpayers while lowering dependencies on the electricity grid. At the same time, the system prevents the emissions of around 860 tonnes of CO₂ each year, supporting climate goals and accelerating the transition to clean energy. But León's most valuable contribution is the model itself: a practical, economically sustainable blueprint for collective self-consumption that any city, regardless of size, can learn from and replicate on its own path toward energy sovereignty.
