With regard to the great science fiction movies, like Blade Runner and the Alien series - I don't recall ever seeing a building covered in solar panels, or great swathes of wind turbines. I do recall the cities being lit up with tonnes of neon - there seems to be no shortage of electric power in the future. How much juice does it take to make a car fly, such as in The Fifth Element? Not to mention space travel.
Given that many portray some sort of perfect society (Aeon Flux for instance), where is all the green power? Where do the robots in I, Robot get their power from? Not many seemed to have propellers sticking out of the top of their heads.
And the Death Stars were not clad in solar panels - they were covered in laser cannons instead. Ever tried destroying a planet with a wind powered death ray? Or firing a solar powered phaser at Klingons?
I know it's only fantasy, but good science fiction has some element of possibility about it. I remember when Blade Runner was released, and people gasped at the scene where Harrison Ford used a photo scanner to zoom in on bits of a photo using voice recognition. That movie came out in 1982, when digital photography was fantasy to the people watching that movie.
Just a thought.