I suspect solar + batteries will be dominant (but should not be the exclusive source) in places which get relatively good sun even in the winter. California and

I suspect solar + batteries will be dominant (but should not be the exclusive source) in places which get relatively good sun even in the winter. California and Hawaii, for example, will do pretty well with a mix that is heavy on those technologies. But if you're in North Dakota or Alaska and want to electrify your grid, you might not have a good time in December and January. There's arguments to be made about having more transmission so you can move electricity from one place to another, but that's also expensive and difficult to build and comes with downsides like vulnerability to natural disasters and attack along a much longer path. Or, as in California, the transmission is its own latent source of disaster that can immolate the state.