A Slew of Coal Plants Get New Lease on Life—With Gas

Old U.S. coal-fired power plants, the target of new anti-pollution rules, aren't necessarily shutting down. Many are getting a second life as they're "repowered" with natural gas.   Decisions to keep running these plants—which are often more than 40 years old—have sparked court battles in New York and are raising questions about how much should be done to retain legacy fossil-fuel facilities.   Continue reading on The Great Energy Challenge.