ABB Successfully Implements Turbine Retrofit Project in New Mexico

Four Corners Power Plant places second order for Unit 4 with increased scope

Chicago, Illinois, May 12, 2009 - ABB, the leading power and automation technology company, has successfully completed commissioning the Turbine Control Retrofit project at the Four Corners power plant near Farmington, New Mexico. Based on the success of the above project, the Four Corners plant has recently placed an additional order for an identical unit known as Unit 4, with increased scope.

The scope of the project included a retrofit for one of the turbine rotors, as well as the mechanical-hydraulic controls for the 750 MW main steam turbine. The project involved removing the original mechanical governor and retrofitting the 'wet box' actuator and interface to the steam valves, as well as a new 'overspeed trip system.' In addition to the traditional base speed and load control, the control solution included an automatic turbine start-up program and rotor stress monitoring.

On completion of the Unit 5 turbine retrofit project, the unit ramped up smoothly and adjusted to lower loads than it has with the new ABB turbine controls. ABB has worked closely with the plant operations team at Four Corners for more than two decades leveraging their combined experience in power generation technologies.

"We are delighted with the success of this retrofit and pleased with the life extension, energy efficiency and optimization benefits it will bring to the plant", said Kevin McAllister, Head of ABB's Power Generation division in North America.

As part of the Unit 4 order, the scope of work has been enhanced to include the replacement of low pressure pilot valve actuators on the boiler feed-pumps with the final element high pressure actuators supplied by the new hydraulic skid to be installed for the main unit. The existing vibration monitoring system will also be replaced with ABB's turbine vibration monitoring system. Installation and start-up of Unit 4 is scheduled for the spring of 2010.

About ABB

ABB ( is a leader in power and automation technologies that enable utility and industry customers to improve their performance while lowering environmental impact. The ABB Group of companies operates in around 100 countries and employs about 120,000 people. The company's North American operations, headquartered in Cary, North Carolina, employ about 15,000 people in 20 manufacturing and other major facilities.

For more information, please contact:
ABB Media Relations
Bill Rose
919.807.5743 - office
919.244.4879 - mobile

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