I'm going to guess if net energy use goes up, due to a glut of renewable energy, the gaps on cloudy, windless days will result in greater fossil fuel use than before.

There need to be assurances renewables are replacing fossil fuels rather than just adding capacity.

> the gaps on cloudy, windless days will result in greater fossil fuel use than before

How can it possibly, when ""before"" (what dates and countries are we talking about?) was mostly fossil fuel anyway?

Remember that Germany, France, Spain and Poland look completely different in terms of energy mix!