Constellation N.Y. Nine Mile 1 reactor at full power

NEW YORK, Oct 29 (Reuters) - Constellation Energy Group Inc's CEG.N 621-megawatt Unit 1 at the Nine Mile Point nuclear power station in New York returned to full power by early Wednesday, the U.S. Nuclear Regulatory Commission said in a report.

On Tuesday, the unit was operating at 74 percent power after exiting an outage earlier in the week.

The company shut the unit on Oct. 23 due to the loss of the electronic pressure regulator.

The 1,761 MW Nine Mile Point station is located in Scriba in Oswego County, about 90 miles east of Rochester New York. There are two units at the station, the 621 MW Unit 1 and 1,140 MW Unit 2, which entered service in 1969 and 1988.

Unit 2 continued to operate at full power.

One MW powers about 800 homes in New York.

In 2006, the NRC renewed the plant’s original 40-year operating licenses for both units for another 20 years until 2029 and 2046.

Earlier this month, UniStar Nuclear Energy LLC, a venture between Constellation and France's EDF EDF.PA, filed with the NRC for permission to build one of Areva SA's CEPFi.PA 1,600 MW U.S. Evolutionary Power Reactors (EPR) at the site.

Using an industry estimate of $4,000 per kilowatt, the new reactor would cost about $6.4 billion. Other nuclear operators considering the EPR however have estimated the total cost as high as $10 billion.

Constellation, which owns all of Unit 1, operates the station for its owners. Constellation (82 percent) and Long Island Power Authority (18 percent) own Unit 2.

Constellation, of Baltimore, owns and operates about 9,000 MW of generating capacity, markets energy commodities in North America, and transmits and distributes electricity to 1.2 million customers and natural gas to 630,000 customers in Maryland. (Reporting by Scott DiSavino; Editing by John Picinich)