Some say Tennesseans could face higher electric bills, power shortages and job losses when a series of new or anticipated federal regulations hits coal-fired power plants in the coming months and years. Others argue the changes could lead to a cleaner environment, fewer health problems and small increases in power rates.

Those are the two outcomes being touted as power companies warn of a “regulatory train wreck” — a combination of Environmental Protection Agency rules restricting the toxins and other pollutants they can send in the air, how their cooling systems use water and how they must dispose of waste.

One of those rules, finalized in July, requires Tennessee and 26 other states to cut power plant emissions that cause air quality problems in downwind states.