Idaho Power bills could soon be going up Idaho Power has filed for cost adjustments that could cost the average residential customer nearly $3 more per month starting in June. Author: KTVB Staff Updated: 1:51 PM MDT April 19, 2021 BOISE, Idaho — Idaho Power customers may notice a slight bump in their electric bill this summer. Idaho Power recently filed for an annual spring cost adjustment with the Idaho Public Utilities Commission. The company also filed for a fixed cost adjustment in March. If both are approved, Idaho Power residential customers could see their bill increase by about $2.94 each month starting June 1, 2021. Neither Idaho Power nor its shareholders receive any financial return from this filing.