By Ben Geman - 01/19/12 03:21 PM EST
The rules, under a 2010 settlement with environmental groups and others, were initially slated to be proposed last summer and completed next May, but the schedule has repeatedly slipped.
McCarthy said the rules will be beneficial for the public and the power sector, which is by far the largest stationary source of carbon emissions that are contributing to global warming.
“We are trying to do this to benefit the industry for certainty as well address the issues associated with climate change,” McCarthy said.
“We think regulating greenhouse gases from power plants is a reasonable and appropriate thing to do and one that could help in terms of providing certainty to investments moving forward,” she said.