If one cooked ethanol from a synthetic sugar that was self replenishing, like yeast, used solar to produce the heat and the steam from the cooking was forced through a turbine in a closed system so as not to lose water, that'd be pretty damn efficient I'd imagine. They key and the part that I don't believe exists, is the magic sugar.

Would make a hell of a home setup though if it could be scaled. While the sun is up you're producing power through the turbine and when it goes down you burn the ethanol that was produced to spin a generator.

Eh... just pondering. I don't have TV.