Our power plants play a key role in black start service. In the event of a blackout in the national grid, the power plants in Valpelline, Avise, Perrères, Maën, Covalou, Pont-Saint-Martin, Gressoney, Sendren, and Zuino are fit to restore power to a portion of the grid, thus contributing to the process of reactivating the national service. In addition, some of our hydroelectric power plants, operating in "island" mode, can guarantee the supply of electricity to the side valleys in the event of a grid outage.