Rarely do American Presidents display the raw willfulness that President Obama did Monday in rolling out his plan to reorganize the economy in the name of climate change. Without a vote in Congress or even much public debate, Mr. Obama is using his last 18 months to dictate U.S. energy choices for the next 20 or 30 years. This abuse of power is regulation without representation.

The so-called Clean Power Plan commands states to cut carbon emissions by 32% (from 2005 levels) by 2030. This final mandate is 9% steeper than the...