yes, batteries, power to gas, ... There are many possiblities. https://en.wikipedia.org/wiki/Energy_storage https://en.wikipedia.org/wiki/Energy_storage Then

yes, batteries, power to gas, ... There are many possiblities. https://en.wikipedia.org/wiki/Energy_storage https://en.wikipedia.org/wiki/Energy_storage Then there is wind power and other sources such as geothermal energy and Bio-gas Plants, which is are independant of day time. And let's not forget the lower energy demand at night, the possibilities for supply based energy consumption, (green) gas imports from somewhere else.