Energy is cheapest during the day because solar is producing. In my country what happened is that hidro now works as a "battery": it's not used while the sun sh

Energy is cheapest during the day because solar is producing. In my country what happened is that hidro now works as a "battery": it's not used while the sun shines compared to what happened ten years ago, and it enters the grid inbthe afternoon. Despite not being connected like reversible dams, it allows the regular dams to save water and work paired.