One of three standby diesel generators at STP Unit 2 fails during routine test

HOUSTON, Dec. 12, 2003 — Texas Genco Holdings Inc., announced that on Dec. 9, one of three standby diesel generators at Unit 2 of the South Texas Project (STP) nuclear facility experienced a failure during a routine monthly surveillance test.

Texas Genco owns a 30.8 percent interest in STP.

STP Nuclear Operating Company personnel have informed the Nuclear Regulatory Commission and are completing the analysis to determine the cause of the failure and are developing a repair plan. The unit continues to operate at full power and has two operational standby diesel generators.

At this time, the company cannot predict the cost of repairs or if this event would require an outage.

CenterPoint Energy, Inc., headquartered in Houston, Texas, is a domestic energy delivery company that includes electric transmission and distribution, natural gas distribution and sales, interstate pipeline and gathering operations, and more than 14,000 megawatts of power generation in Texas.

The company serves nearly five million customers primarily in Arkansas, Louisiana, Minnesota, Mississippi, Missouri, Oklahoma, and Texas. Assets total approximately $20 billion. CenterPoint Energy became the new holding company for the regulated operations of the former Reliant Energy, Incorporated in August 2002. With more than 11,000 employees, CenterPoint Energy and its predecessor companies have been in business for more than 130 years. For more information, visit the Web site at .