Minnesota electric and gas customers were temporarily overcharged on interim rates in nine out of 10 cases since 2008. Interim rates are granted almost automatically to utilities during the months a rate increase request is under regulatory review. Any overcharges are refunded with interest after final rates are approved.
Note: Dollars in millions InterimApprovedPercent
CompanyYearincreaseincreaserefunded
Minnesota Power (E)2008$36.4$15.258%
Xcel Energy (E)2008$150.5$103.931%
CenterPoint Energy (G)2008$77.2$61.520%
Minn. Energy Resources (G)2008$26.2$20.821%
Xcel Energy (G)2009$14.4$9.534%
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