AmerenUE is an associate member of the Utilities Service Alliance, Inc., consisting of 14 utilities operating 31 reactors capable of producing in excess of 30,850 megawatts of electrical power. With the addition of AmerenUE's Callaway plant, Shaw provides nuclear maintenance services to seven nuclear units within the alliance, including two units operated by Southern California Edison, two units operated by South Texas Project and two units operated by Luminant.

Under the new contract, Shaw will provide routine maintenance/modifications, refueling maintenance/modifications and capital construction services. The undisclosed value of the contract will be included in the Maintenance segment's backlog of unfilled orders in the first quarter of fiscal year 2010.

"We have established a solid foundation of nuclear maintenance with other members of the Utilities Service Alliance," said Fred Buckman, president of Shaw's Power Group. "We are committed to working hand-in-hand with AmerenUE to build upon the Callaway nuclear plant's refueling outages success while upholding Shaw's core values of safety and superior operational performance."

Shaw provides systemwide maintenance and modification services to 40 of 104 U.S. nuclear reactors in the United States, including the country's two largest nuclear fleets. Shaw is a leader in nuclear refueling outage performance with significantly shorter outages than the industry average and has performed uprates and studies on 48 operating pressurized water reactor (PWR) and boiling water reactor (BWR) nuclear units, adding more than 2,265 megawatts to the U.S. grid.

With assets of approximately $23 billion, Ameren serves approximately 2.4 million electric customers and almost one million natural gas customers in a 64,000-square-mile area of Missouri and Illinois. Ameren owns a diverse mix of electric generating plants strategically located in its Midwest market with a generating capacity of more than 16,400 megawatts.

The Shaw Group Inc. is a leading global provider of technology, engineering, procurement, construction, maintenance, fabrication, manufacturing, consulting, remediation and facilities management services for government and private sector clients in the energy, chemicals, environmental, infrastructure and emergency response markets.