Idaho Power Co. filed for a decrease of approximately $19.3 million for residential and small general service customers for its annual fixed cost adjustment, or FCA.

The IDACORP Inc. subsidiary on March 15 submitted an application with the Idaho Public Utilities Commission requesting FCA rates resulting in an overall decrease of 3.6% annually from current billed revenue for the affected customers.

The proposed FCA rates are approximately $14.9 million for the residential class and approximately $820,771.46 for the small general service class, totaling to $15.7 million.

Idaho Power said it saved 191,471 MWh in "incremental" electricity through energy efficiency programs in 2017. Despite the increase in energy efficiency, the utility said customers will experience a reduction in the surcharge because because usage per customer was greater than in 2016.

If approved by the commission, a typical residential customer using 950 kWh of electricity monthly would see a decrease of about $3.60 each month.

The company requested the commission to implement these rates from June 1 through May 31, 2019.