coal power plants in the U.S., with an average size of 667 megawatts (MW) and an average age of 40 years. 2. One 500 MW coal-fired power plant produces about 3 million tons/year of CO. 2. If 60% of the CO. 2. from all these plants were captured and compressed to a liquid for underground injection, its volume would equal the U.S. oil consumption of 20 million barrels/day. 3