"Un Deux Toits Soleil" is the Lyon metropolitan area's community-led renewable energy project

Energy
Objectives
We contribute to the development of renewable energy by investing in solar panel installations on the roofs of public and private buildings.

Social
We aim to raise residents’ awareness of energy conservation, energy efficiency, and renewable energy.

Key Figures

• 27 solar panel installations
• 3,500 panels, 70% of which are made in France
• 240 tons of CO2 avoided by 2025

Un Deux Toits Soleil brings together six citizen groups working as volunteers on the ground to support and champion these projects locally:

• Toits en Transition (which brings together long-time volunteers, residents of Lyon’s districts, and VivaWatt in Villeurbanne)
• Watt-Saône in the Val de Saône – Mont d’Or
• ENCOLY (Energies Nouvelles Citoyennes de l’Ouest LYonnais) in the Val d’Yzeron
• Dardilly en Transition in the town of Dardilly

New “Habitats Collectifs 2026” campaign

In 2026, Un Deux Toits Soleil will oversee the construction of two solar power plants (with capacities of 75 and 99 kWp and 160 and 220 panels, respectively) on two new collective housing developments.