Recent Overhead Transmission Line Projects

Sargent & Lundy performed complete engineering and design for 31 miles of double-circuit and 12 miles of single-circuit 260-kV transmission line located in Alberta, Canada. This line was constructed on steel lattice towers, with a 5-mile single-circuit section on wood H-frames. The project involved the design of foundations in muskeg, using multi-helix screw anchors to support the tower legs. The line also included a 2,000-foot river-crossing span. Completed in 2002.

The River Mountains Project consists of two 230-kV transmission lines in the vicinity of Boulder City, Nevada. The project was developed jointly by the Colorado River Commission (CRC), Nevada Power Company (NPC) and the Southern Nevada Water Authority (SNWA). The transmission lines, which extend approximately 30 miles from the Western Area Power Administration Mead Substation to CRC's Newport Substation and NPC's future Equestrian Substation, include rebuilds of two of NPC's existing 69-kV transmission lines as underbuilt circuits. The lines were constructed on lattice steel towers and tubular steel poles. Sargent & Lundy performed construction inspection services for this project. Completed in 2001.

Sargent & Lundy performed engineering for the interconnection of the Horizon Wind Energy Twin Groves Wind Farm to the Commonwealth Edison transmission network. Our engineering and design included the 34.5/345 kV substation at the termination of the wind generator collection system, 16 miles of 345-kV transmission line, a 345 kV substation, a 3-breaker ring bus adjacent to the existing transmission line, and coordinating the interface of the protection and control systems. The project was constructed in two phases, each generating 200 MW of power. Phase II was completed at the end of 2007. The facility includes 267 wind turbine generators, with a rated capacity of 1.5-1.65 megawatts each.

Sargent & Lundy is performing complete project services for this downtown 138/13.8-kV substation including related underground and overhead transmission lines. An existing open-air substation is being demolished and replaced by a multilevel, enclosed GIS facility with a cable vault area housing 138-kV transmission lines and 15-kV distribution feeders. The project includes reconductoring a 69-kV underground line and replacing four 138-kV oil-filled underground transmission cables with XLPE cable and high-pressure gas-filled cable. Our scope includes overall program management, engineering and design, procurement support, construction management, and commissioning. Engineering was initiated in September 2006, and the substation is scheduled to be energized mid-2008.

Project Profile: Waterside West 138/13.8 kV Project

Sargent & Lundy is providing engineering for this 138/12-kV substation adjacent to the Las Vegas resort "Strip" and designing the associated overhead and underground transmission and distribution lines. Segments of the 5 miles of line are being designed to accommodate a future, overbuilt 230-kV circuit and the 138-kV circuit and future 230-kV circuit to be installed underground. Engineering was initiated in August 2007 and the project is planned to be in service by June 2009. Sargent & Lundy's team includes Arcadis, Finley Engineering, and USi/GAI.

Project Profile: Collman 138/12 kV Project

As part of an EPC team, Sargent & Lundy is performing complete engineering construction quality assurance and commissioning services for a major upgrade of the transmission and distribution system in the PacifiCorp Salt Lake City region. The prime contractor is Kenny Construction Company of Chicago, IL. The scope of work includes 7 transmission projects involving a total of approximately 50 miles of 138 kV line, plus an additional 15 miles of line to accommodate the new and upgraded substation projects. The majority of the projects were completed to meet summer peak loads in 2003 and 2004 and the remaining projects completed in 2005.

To provide a satellite switchyard at the Palo Verde Nuclear Power Plant, Sargent & Lundy performed engineering for a 3-mile 500 kV tie line between the existing switchyard and the new Hassayampa 500 kV Switchyard and for the modification of two existing 500 kV lines that were looped into the new switchyard. These lines were built on lattice steel towers with steel pole structures for phase transpositions.

Sargent & Lundy has been performing continuing engineering for SDG&E under the terms of a general services agreement. Recent assignments have included the engineering for uprating the Miguel-Mission, S. Bay - Main Street and San Onofre-Encina transmission lines and evaluation of existing 138-kV and 230-kV double-circuit towers for the installation of optic fiber ground wire.

Sargent & Lundy is leading a team that is providing a wide range of services to support SDG&E on their proposed major, new transmission interconnection from the east side of their service territory-the Sunrise Powerlink. The project is proposed to include approximately 100 miles of new 500-kV transmission line, approximately 30 miles of new 230-kV line, a new 500/230-kV substation, and upgrades to a number of existing lines and substations. The scope of work is divided into three phases: I - Route evaluations, public outreach, environmental licensing, and preliminary engineering: II - Detailed engineering, procurement support, and land acquisition support, and III - Construction management. The current plan is to file the environmental permit applications by mid-2006, start construction in the 3rd quarter of 2008, and place the line in-service in 2010.

Sargent & Lundy performs a substantial amount of engineering for the TVA transmission system. TVA has awarded long-term engineering alliance contracts to Sargent & Lundy on the basis of comprehensive technical and commercial evaluation processes that have provided the basis for a continuous working relationship. The current contract extends to mid-2009, with options to extend for 5 additional years. Projects have included new 69-kV and 161-kV transmission lines, upgrades to existing lines, retrofits of lightning arrestors and assessment of existing lines for increased operating temperatures.