Eidsiva Energi is a Norwegian energy company based in Hamar with large sections of Oppland and Hedmark as core market and is the largest producer distributor and trader of electricity in both counties. The corporation had a revenue of NOK 3.5 billion and market capitalization of NOK 9 billion in 2006. It is owned by Hedmark county municipality Hedmark county municipality as well as by 25 municipalities.
Key people are Ingeborg Moen Borgerud and Ola Mørkved Rinnan.