Old Power Plants Need New Rules

 The Environmental Protection Agency’s proposal earlier this week to reduce greenhouse gases from new power plants was hailed by many environmentalists, but unless steps are taken quickly to bring existing plants under the rule, it will create a perverse incentive for companies to keep running older, more heavily polluting power plants. That’s bad economics that could lead to dirtier air. The proposal would regulate carbon emissions from future power plants but leave existing sources untouched. This is yet another instance in a more than 40-year pattern under the Clean Air Act in which old and outdated technology has avoided new environmental standards. The result is continuing unhealthy levels of pollution.