Overcharging customers on interim rates

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%

Minnesota Power* (E)2009$32.8$36.1-10%

Otter Tail Power Co. (E)2010$6.3$2.462%

Interstate Power Co. (E)2010$17.7$14.121%

Xcel Energy (E)2010$153.7$76.850%

Minn. Energy Resources (G)2010$9.8$7.8021%

*Interim rate decision on appeal before Minnesota Supreme Court.