American Electric Power Co Inc (AEP.N: Quote, Profile, Research, Stock Buzz) planned to shut the 690-megawatt Oklaunion coal-fired power station in Texas from May 4-7 for steam turbine and generator repairs, the company told Texas regulators in a report.

In another report, the company said it planned to work on the unit from May 4-14.

The company did not say when the unit would return.

In another report, the company said the unit would exit its annual maintenance on May 4-7. The company did not say when it shut for the annual maintenance.

Traders noted AEP planned to shut the unit from about Jan. 31 to about April 2 for annual maintenance. The traders did not know if the unit returned from that maintenance in April.

The Oklaunion plant, which entered service in 1986, is located in Oklaunion in Wilbarger County about 190 miles (305 km) northwest of Dallas.

One MW powers about 500 homes in Texas.

AEP's regulated subsidiary, AEP Public Service Co of Oklahoma, operates the station for its owners: Brownsville Public Utilities Board (18 percent), Oklahoma Municipal Power Authority (11.7 percent), AEP Public Service Co of Oklahoma (15.6 percent) and AEP Texas North Co (54.7 percent).

AEP, of Columbus, Ohio, owns and operates more than 38,000 MW of generating capacity, markets energy commodities, and transmits and distributes electricity to more than 5 million customers in 11 states. (Reporting by Scott DiSavino; Editing by Lisa Shumaker)