Lee Zeldin, the E.P.A. administrator, said erasing regulations would produce jobs and lower electricity costs. He called efforts to fight climate change “a cult.”

The announcement is a key step in Trump’s broader efforts to unwind environmental regulations he views as unnecessary barriers to industrial development

The Trump administration will propose scrapping Biden-era climate mandates requiring the nation’s power plants to curb planet-warming greenhouse gas emissions as soon as Wednesday, according to people familiar with the matter.