Some, like Indianapolis Power and Light's plant in Indianapolis, are converting to run on natural gas.

More than 100 of Indiana's sewage systems need improvements to comply with federal standards, and the Environmental Protection Agency has sued many cities and towns over sewage overflow problems. Some cities are building new sewage overflow tunnels to fix the problem.

Sen. Rick Niemeyer, R-Lowell, says it's not fair that Lake and Porter counties are lumped in with metropolitan Chicago.

Given the amount of time it takes to go through appeals court, it is unlikely that the case will make it to the Supreme Court before Justice Scalia is replaced.

Coal industry representatives in Indiana, one of the nation's top coal-producing states, say the Supreme Court's stay of the Environmental Protection Agency's Clean Power Plan has little immediate effect on the state.

The Environmental Protection Agency announced Wednesday that Southern Indiana Gas and Electric Company has agreed to install pollution control equipment expected to reduce sulfuric acid emissions from both power plants by approximately 1,400 tons each year.

Environmental group the Sierra Club will launch digital and print ads this weekend pushing Democratic Sen. Joe Donnelly to oppose legislation curtailing the Environmental Protection Agency's new Clean Power Plan. He is being targeted as a potential swing vote in the Senate.

The keynote speaker at Saturday's event will talk about the new federal coal ash rules, and how they may impact Indiana communities.

The U.S. Environmental Protection Agency says Illinois should get a chance to publicly object to a proposed northwest Indiana quarry on the Kankakee River.

Indiana was part of an effort to block the EPA's power plant rule before it became final. The latest lawsuit - involving Indiana and 22 other states - takes aim at the regulation now that it's taken effect.