Long distance high voltage DC inter ties are a thing (there is one running from Washington to southern california), but very costly to build.

If you have a truly ridiculous amount of free or almost free photovoltaics somewhere, you could theoretically crack hydrogen from seawater and compress it into tanks, ship it elsewhere (using hydrogen powered ships, hopefully) to be run through giant proton exchange membrane fuel cells. Right now its economics are prohibitively bad. But do the math if the electricity to run the cracking process was far under 1 cent per kWh...