Monticello Nuclear Generating Plant

Operator: Xcel Energy/Northern States Power Company - Minnesota
Location: 40 miles northwest of of Minneapolis-St. Paul, Minn.
2807 West County Road 75
Monticello, MN 55362
Operating License Unit 1: AEC Prov. Lic Issued – September 08, 1970, NRC Facil Op Lic (OL) Issued January 09, 1981, Expires September 08, 2030
Reactor Type: Boiling Water Reactor (BWR)
Electrical Output Unit 1: 600 Megawatts Electrical (MWe)
Monticello Extended Power Uprate

• Extended Power Uprate (EPU) refers to an increase in thermal output from the reactor greater than 7 percent of the thermalpower when the plant was originally licensed by the Nuclear Regulatory Commission.

• The Minnesota Public Utilities Commission in January 2009 approved Xcel Energy’s request to increase electricity generating capacity at Monticello through an extended power uprate from 600 to 671 megawatts. The commission agreed that the company had shown the additional generating was needed to serve its customers.

• Monticello completed a nine-year process of virtually rebuilding the its plant to increase its generation from 600 to 671 megawatts. Major equipment was installed during the refueling/uprate outages in 2009, 2011 and 2013.

• The major components included a high pressure turbine rotor, reactor steam dryer, condensate demineralizer system, 13.8kV electrical distribution system with new transformers powering feedwater pumpsand motors, condensate pumps and motors, new feedwater heaters and new heat exchangers. The final pieces of equipment were replaced in the 2013 outage in which more than 3,000 workers were on site to complete the work. Life cycle management upgrades included a new main transformer and generator rewind—both original equipment when the plant was commissioned for operation in 1971,a 40-year run. To request a speaker on nuclear power issues, go to and click on Speakers Bureau in the Company/Community section.
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