Led by energy committee Chairman Joe Manchin (D-WV), a bipartisan group of 47 senators is pressing the Department of Energy (DOE) to rethink its proposed distribution transformer efficiency rule, claiming the regulation would impose a “meaningful cost” on grid reliability, national security, and domestic supply chains. The group’s June 1 letter , signed by 33 Republicans and 14 Democrats, is the latest twist in the debate over DOE’s January proposal that has split utilities and efficiency groups, with the former...