Save for later Print Download Share LinkedIn Twitter The US Supreme Court is weighing the extent of the federal government’s authority to write greenhouse gas (GHG) regulations that could reshape the power sector. During oral arguments, the court’s conservative justices made clear they are considering constraints on how far the Environmental Protection Agency (EPA) can go under the Clean Air Act to regulate the power sector. The litigation carries implications for US President Joe Biden’s climate and energy agenda, as an adverse ruling could run roughshod over the administration’s efforts to curb carbon emissions from the power sector. But legal sources have said a ruling may not necessarily curtail other GHG regulations, such as methane rules for oil and natural gas operations.