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%

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%

Note: (E) electric rates; (G) gas rates

*Interim rate decision on appeal before Minnesota Supreme Court.

Source: Minnesota attorney general