[otabdeveloper4]

"Batteries" is not an energy source.

[ben_w]

They don't need to be, they only need to be a way to get energy from when/where it's made to when/where it's needed.

Batteries are fine for shifting the "when", just like power lines are fine for shifting the "where".

[jenscow]

Until it's not windy or sunny

[TheLoafOfBread]

With this logic, hydrogen is energy source then.

[runarberg]

But with the other logic, oil is not an energy source either, it is rather an energy storage that just so happened to store energy created by the sun millions of years ago.

I think it is OK to be loose on the technicalities in this instance, we all know what was meant.