You must be thinking of the Heinlein story "Let There Be Light"
<http://en.wikipedia.org/wiki/Let_There_Be_Light_(short_story)> The Ursula K. Le Guin story, “The New Atlantis” was also about the discovery of a cheap and easy way to capture energy, only in this case the enemy was a pseudo-communist state that used energy scarcity to control its populace. That story felt more realistic to me than most of Heinlein's stuff does.
Recently I've been remembering an early Robert Heinlein story ... I bet lots of folks on this list know it... the one where they discover a way to capture energy from the sun at no or very little cost... (and fight big companies that don't want this information made public) ... the usual Heinlein interplay between a smart scientist guy and an equally smart wise-cracking woman... I can't recall the name of the story, or find it on my shelves. But I find myself remembering it these days, and thinking "if that is ever going to become a reality, now would be a real good time."
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