> Not on the scale of "we need to move the bulk of the energy from Texas to New York for 3 hours, then when the sun sets shift state-level power supply routing from the cornbelt to cover the drop."

Sure, but that's why you favor a regionally balanced mix of renewables, with regional peaker plants (which may not be clean/renewable, but are better than relying on dirty sources for your core needs) not geographic concentration of single sources.