Hi,
The upper midwest of the USA and offshore, the wind blows quite steadily. The southwest has lots and lots of sunshine, and most other areas can certainly produce power from PV much of the time. The ocean tide is always shifting, and there are almost always waves offshore. Geothermal heat is definition of dependable -- drill a deep hole anywhere you choose, and pump water down there, and you'll get steam to run a generator.
With efficient grid distribution, all this power can be "moved" to where it is needed.
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