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We could build low-head turbines to anchor across the Bay of Fundy and supply all the power North America could use for the next half dozen centuries.

If we built a large enough magnet at the Straits of Florida (something that is now feasible with carbon nano tubes) we could use magnetohydrodynamics to obtain enough electric power for the entire world for many years.

If we could put up a really neat kite/balloon somewhere over Alaska we could tap right into the magnetosphere and provide sufficient electric power to develop Northern Canada while also powering up the Lower 48.

If we......... built atomic power plants .................

Did you see any windmills in that ?

No you didn't. That's because "per kilowatt hour" windmills are too costly compared to any one of those proposals.

We could build low-head turbines to anchor across the Bay of Fundy and supply all the power North America could use for the next half dozen centuries.

Any credible links? Maybe we should build both? ;-)