On the other hand, solar technologies may have almost zero capacity credit if the peak demand occurs in the evenings during winter, as in several north European countries, especially those relying heavily on electric heating such as France. Dispatchable plants for instance are weakly correlated and their capacity credit can thus be higher than their respective load and availability factors: their planned outages are scheduled during periods of weak electricity demand, while they are supposed to be available during high demand periods. On the contrary, variable renewables relying on the same natural resource are closely correlated (one wind turbine is likely to stop turning the very moment that other turbines stop turning). Thus, the capacity credit of variable renewable power plants decreases with the penetration level, reflecting the increased correlation with the rest of the generating system.