500-Megawatt, Combined-Cycle Power Plant

Rank #6
Cost: $245 million

In recent years blackouts have spawned the need for new power plants and work for the construction industry in New York.

In 2003, Slattery Skanska and Gottlieb Skanska began construction on a state-of-the-art combined-cycle plant in the Astoria section of Queens on a four-acre site next to the existing Charles M. Poletti Generating Station. The new plant will add 500 MW to New York's power supply.

The project team is responsible for the overall construction of the plant, including the erection of a 97,000-sq.-ft., two-story building to house all of the sophisticated plant equipment. Slattery Skanska will perform the installation, testing and commissioning of all equipment, including two dual-fuel Frame 7FA Combustion Turbine Generators and one D11 Steam Turbine Generator, all manufactured by General Electric.

The team will install, test and commission two heat-recovery steam generators manufactured by Vogt-NEM Inc. Each generator will feature a 160-ft.-tall steel stack.

The plant will burn natural gas, with low-sulfur oil as a backup, and use a sophisticated combined-cycle technology that is cleaner and more efficient than most plants. The plant will be equipped with the most advanced Selective Catalytic Reduction emission controls.

Slattery Skanska will directly perform the civil, structural and mechanical work, which includes installation of 110,000 lin. ft. of process piping; 500 monitoring instruments; a one-million-gallon water tank; and a 32-cell, air-cooled condenser.

The project team will also manage the installation of the plant's electrical systems, which include a digital control system, three step-up transformers, switch gear, 1.4 million lin. ft. of cable, 215,000 lin. ft. of conduit and 26,000 lin. ft. of cable tray.

Under a separate contract Slattery Skanska's subsidiary, Underpinning & Foundation Skanska, drove approximately 2,500 steel H-piles averaging 40 ft. long and drilled 37 24-in. and 30-in. caissons into rock.

Workers are performing some field activities in shifts around the clock. As many as 650 workers, representing 15 local labor unions, will be employed during construction.

All construction equipment and vehicles onsite will be required to use low-sulfur fuel and particulate-control technology to limit emissions and protect air quality.

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