Important! Rocky Mountain Power's planned changes to the energy efficiency program will become effective September 3, 2018. Changes include streamlining incentive tables to only include measure offerings and maximum incentive levels. Qualifications for energy efficiency measures going forward will be maintained on the wattsmart Homes program website. For questions or additional clarification, please email [email protected].

Modified Energy Factor (MEF)

Modified Energy Factor, or MEF, is a calculation used to compare the relative efficiency of different clothes washers. The higher the value, the more efficient the clothes washer. To find your clothes washer's MEF, go to the ENERGY STAR® website.

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