Transmission Loop Conversion to Underground

Location: San Juan, Puerto Rico

Client: Puerto Rico Power Authority

Completion Date: 2006

To increase system reliability, Puerto Rico Power Authority (PREPA) is putting its 25.4 mile 115-kV overhead transmission loop around San Juan underground. The project was divided into five phases; Burns & McDonnell assisted in the engineering of Phase I and Phase IV.

Phase I of this project spans 5.4 miles from Monacillos Substation to Hato Rey Substation and Phase IV spans 5.9 miles from Bayamon Substation to Monacillos Substation. The system includes a new 115-kV circuit, a future 115-kV tie in, and a future 38-kV circuit.

Burns & McDonnell worked in conjunction with the turnkey team to provide a seamless and cost effective design through weekly conference calls and periodic design conferences. Engineering services included providing: final routing of duct bank, a complete set of plans and profiles, pulling tension calculations, cross bonding calculations, duct bank design, ampacity calculations, and construction support.

  • Technical Routing & Layout
    • Detailed Engineering
    • Pulling Calculations
    • Trenchless Crossing
    • Layout
    • Construction Drawings and Specifications
  • Construction Support