Utility companies argue the EPA rules will increase electricity bills, but the EPA predicts Americans will actually save money in the long-term.
The majority opinion states the Environmental Protection Agency failed to account for the costs of implementation of its emission regulations.
The ruling would require 28 states including Indiana to reduce their emissions that impact other states.
In 2012 the Environmental Protection Agency put emission standards in place for coal fired power plants, and Indiana is one state appealing the new rules.
Indiana, along with 12 other states, is suing the Environment Protection Agency over new regulations for power plant emissions.
Carmel mayor Jim Brainard is part of a White House task force to improve air quality across the country.
The Environmental Protection Agency says the standards will help combat climate change, but Governor Mike Pence says the proposal could hurt Indiana's economy.
Researchers from Purdue University and other institutions have found a way to pinpoint emissions down to the level of a building or a street.
Energy industry representatives who testified before state lawmakers today say the proposed EPA regulations could negatively impact the Indiana economy.
Indiana has been identified as one of the ten worst states for carbon dioxide pollution.