The USA hosts several manufacturers of medium and large power transformers, including domestic OEMs and U.S. subsidiaries of global companies. They provide HV/MV transformers for utilities, industrial plants, and renewables. Plants focus on North American standards (IEEE/ANSI), DOE efficiency rules, and grid resiliency requirements. Manufacturers offer engineered-to-order units, refurbishment, and long-term service, often supported by regional test and repair facilities.