Same difference with nuclear power. Starting and stopping nuke plants is very expensive/inefficient, yet energy demand is fluctuating wildy. That's why there is an international network for transmitting energy.
One example is French excess nuclear energy in the summer (in central Europe AC are very uncommon, so energy demand is low when it's hot): Germany can more easily switch off renewable plants and import French nuclear power, yet still is a net exporter.
In the summer one runs into cooling problems for the plants too. Sometimes they have to be shut off because the river is already too warm - creating problems for France.
One example is French excess nuclear energy in the summer (in central Europe AC are very uncommon, so energy demand is low when it's hot): Germany can more easily switch off renewable plants and import French nuclear power, yet still is a net exporter.