- {Winfield, West Virginia}...During a speech at the John Amos Power Plant near Winfield Tuesday, Senator Joe Manchin, D-W.Va., said he will vigorously oppose new greenhouse-gas rules proposed last week by the U.S. Environmental Protection Agency. Manchin said, coal generates 45 percent of all energy used in the United States and "is projected to produce the lion's share of energy decades into the future." Manchin also said, between 2006 and 2011, AEP had as many as 3,200 construction workers at its John Amos plant, now one of the world's cleanest coal plants, and those workers installed more than $1 billion worth of scrubbers and other equipment to reduce nitrogen oxide emissions by up to 90 percent.