Dynegy wants to buy the plants, including one in Bartonville, from Ameren Corp. But company officials said the deal hinged on getting a waiver allowing it to delay installing soot-control equipment until 2020. The Illinois Pollution Control Board granted that waiver Thursday. Dynegy cited financial hardship as a reason to get the variance.
Environmental groups had filed formal objections. They say the upgrades are needed and Dynegy is a willing buyer. Officials with the Environmental Law and Policy Center say Thursday's decision will damage public health and the environment.