To answer the original question, you have to cook a study pretty hard to show any energy gains with ethanol from corn (still ignoring aquifer and pollution issues). Ethanol subsidies are welfare for farmers, and I used to think it made more sense than paying farmers to not grow anything, but I'm not so sure now.
As for Eric's question, the correct replacement is a mix of sources. Some solar (more in certain reasons of the country), some wind (more here in the windy parts of the country), lots more nuclear and clean coal for baseline, we'll still be stuck with gas for peak loads or making up shortfalls for lack of sun or lack of wind. If we power the grid with these (especially nuke) we have enough oil to make plastic and run our cars and antique tractors for a long, long, time.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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