By: James Coleman
PDF Version: Supreme Court: EPA Should Have Considered Cost When Deciding Whether Mercury Limits for Power Plants Were Appropriate
Case Commented On: United States Supreme Court, Michigan v United States Environmental Protection Agency (June 29, 2015)
On Monday the United States Supreme Court held that the Environmental Protection Agency (EPA) improperly refused to consider costs when determining whether it was “appropriate and necessary” to regulate mercury emissions from power plants under the Clean Air Act. Ultimately, the EPA may be able to keep the same rules after going back and explaining why the cost of the regulations is justified in the circumstances. But the decision is an important victory for advocates of cost-benefit analysis and those who think environmental agencies should pay more attention to the costs of regulation.
Section 112 of the Clean Air Act directs the EPA to regulate hazardous air pollutants from power plants if it finds “regulation is appropriate and necessary” 42 U.S.C. §7412. The EPA said that regulation was “appropriate and necessary” even without considering costs because 1) power plant emissions posed risks to human health and the environment that were not eliminated by other provisions of the Clean Air Act and 2) there were controls available to reduce those dangerous emissions. So there was no need for the EPA to consider costs to make its initial decision to regulate, but it promised to consider costs when adopting the actual final regulations for power plants.