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Award of Merit: Special Projects Category

Keys Energy Services Transmission Line Structural Repairs Project
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Key West, Florida

Submitted by Power Engineers/Anchor Structural


Keys Energy

Owner
Keys Energy Services
Key West, Florida

Project Engineer/
Designer

Power Engineers
Norcross, Georgia

Repair Contractor
STRUCTURAL
Pompano Beach, Florida

Material Suppliers/
Manufacturers

Fox Industries
Baltimore, Maryland

Monroe Concrete Products
Rockland Key, Florida

This project consisted of the structural concrete restoration of 138 KV transmission line support structures located in the marine environment of Monroe County (Florida Keys), FL. The repairs were completed between November 16, 2009, and February 28, 2011. The structures were deteriorated due to immersion and contact with a high-chloride marine environment and were constructed between the early 1960s and late 1980s. The structures support the sole continuous power source between the east end of the Seven Mile Bridge at Marathon Florida (Mile Marker No. 47) and the southernmost point of the U.S. at Key West, FL, at Mile Marker No. 0.

The project site spans approximately 50 miles (80.5 km) in the environmentally sensitive Florida Keys. The entire area is part of the Florida Marine Sanctuary and is highly regulated by numerous agencies, including the U.S. Army Corps of Engineers, the Florida Marine Sanctuary, the Florida Fish and Wildlife Conservation Commission, the U.S. Coast Guard, and numerous other state and federal agencies. Water depths range from 0 to 25 ft (0 to 7.62 m) at mean low water. Protected coral reefs, sea grass beds, and estuaries abound in and around the project structures.

The nature of this project was inherently critical, as it directly impacted the client’s ability to provide electrical power to its 28,000 customers from Marathon to Key West, FL, on its sole transmission tie line. The failure of even one of the transmission structures within the project scope would have resulted in power outage to a large portion of its service area, likely measured in days or weeks until a new structure could be acquired and installed, making the successful completion of this project particularly important.

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