A return to shadow puppets?

I'm not trying to be cute here, just wonderin' aloud.

We have fossil fuels ("clean" coal, petroleum, natural gas), unproven tidal and wind energy, unproven geothermal, and woefully inefficient photovoltaic solar. Until 500% efficient variations of the above-mentioned, green technologies are invented and implemented in a dirt-cheap manner (and there's no doubt that we need a cleaner way to generate electricity), I'm doubtful that Nuclear Power will be off the table altogether. Unless of course we somehow ween ourselves off electricity...