Shell-Type and Core-Type Power Transformers up to 650 MVA are designed, manufactured and tested at the group's IEM Plant in Tlalnepantla, Mexico. IEM's technology and expertise stems from more than 50 years of experience and previous associations with Westinghouse and ABB. Contact us with your power transformer inquiries. for additional information please look at the official web-site of IEM at www.iem.com.mx