text: By the end of 2013, and despite having spent $2.5 billion, Michigan??s nine oldest coal plants will continue to operate while having their emissions trimmed by no more than 5 percent. But had we chosen to build gas plants instead of wind plants, that same $2.5 billion could build 2,500 MW of gas generating capacity instead of only 225 MW. This is enough to permanently close half of the nine ???dirty coal?? plants in question.