From Mondaq:

Implications of the Court’s Decision

The court’s holding in West Virginia v. EPA can be seen as fairly limited in the sense that it only affects EPA’s authority under a relatively obscure provision of the Clean Air Act. Moreover, as a result of market forces, the U.S. electric power sector has already reduced greenhouse gas emissions well below the Clean Power Plan’s original targets.3 So one could conclude that at the end of the day the court’s decision will have a more limited effect than either its proponents or its detractors might think.

[3] https://www.rstreet.org/2022/06/30/epa-decision-has-major-legal-ramifications-but-minor-climate-impact/