How do i contact sioux valley energy? For billing questions, contact a Member Service Representative at 1-800-234-1960 or email at [email protected]. To contact the Member Services Supervisor, here. The Energy Services department can help answer your questions about heating systems, rebates, energy audits and many other service related issues.What is the address for lake region energy services? Lake Region Electric Cooperative & Lake Region Energy Services 1401 South Broadway Pelican Rapids, MN 56572 Mailing Address for Correspondence:What is the mailing address for midamerican energy services? Corporate Mailing Address MidAmerican Energy Services, LLC 320 LeClaire P.O. Box 4290