Aside from trans-atlantic or pacific power lines (to buy and sell energy on the market), you'll never have enough capacity to provide base-load when the sun isn't shining. People think in terms of residential power usage, but there's a metric fuck-ton of power used in industrial that you simple haven't wrapped your head around yet.
Locally generated base-load has to come from somewhere. Nuclear fission and fusion are the only viable "clean" forms of energy. Well, not unless you're fortunate enough to live near hydroelectric.