The company seeks an increase in its Oregon jurisdictional revenue of about $5.8m per year, or a 14.7% overall average increase.

Idaho Power vice president of regulatory affairs Greg Said told that it is important for the company to achieve fair and timely recovery of its costs to provide customers with reliable electric service, which the current rates do not fully provide.

"Since our last Oregon general rate case in 2009, we have added over $316m in infrastructure needed to continue to provide safe and reliable electric service to our customers," Said added.

According to the company, any resulting rate change will not become effective until on or after 1 June 2012.