Associated Press: The push for more power from renewable fuels has renewed interest in one of the oldest energy sources: wood. While airwaves have been permeated by advertisements for solar and wind power, last year wood generated more net electricity in the U.S. than those two up-and-comers combined. New wood-burning electricity plants are again being proposed from Massachusetts to New Mexico as the nation deals with a volatile energy market. Using wood for electric power generation grew …