Bartow-Northeast 230 kV UG Line

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Client: Progress Energy Florida
Location: Florida, USA 

The expansion of the Bartow Power Plant required the installation of three additional 230 kV underground circuits and one future circuit connecting the power plant and the Northeast Substation. POWER was contracted to provide design and construction inspection for the project. In Phase I POWER determined the best cable system for the project through investigation and comparison of high pressurize fluid-filled and solid dielectric systems. In Phase II POWER provided complete engineering for installation of the selected 230 kV XLPE system. The project is over four miles in length and consists of four circuits with 5,000 kcmil conductors – the largest in the U.S. at the time of installation. The work scope included survey coordination, layout, utility coordination, permit drawings and system design, including design of substation structures and concrete duct bank. Installation involved standard jack and bore, microtunneling, and a double 42-inch diameter, 1,700-foot horizontal directional drill.

Construction Inspection

During construction, POWER provided the services of a full-time construction manager and inspection staff to address contractor Requests For Information and to inspect and approve of all phases of the civil work through complete testing and commissioning. Work included civil inspection of the duct bank installation, termination structure inspection during construction, cable pulling oversight, and splice/termination installation review. The project tied into the Bartow power plant and required significant coordination to minimize disruption in service.