Markets Power Delivery & Generation

EDG’s industrial customer plant expansion project’s scope of work included:

• Constructed new switching station adjacent to existing plant facility. Plant serves project loads via new Systems 230 kV. Switching station now cut in to an existing 230 kV transmission line
• Raised and relocated eight integral, high-voltage transmission lines to 118 ft. above the existing highway grade, at center sag, plus electrical clearances of 69 kV, 138 kV, and 230 kV. Project consisted of 195-foot-tall, single-pole, single-circuit structures with base-plated vibratory caisson foundations
• Replaced existing 560 MVA autotransformer with new 1200 MVA autotransformer to accommodate the increased load requirement
• Built t-line cut-in on the 230 kV transmission line to interconnect the new 230 kV switching station
• Added fiber optic communications in multiple locations
• Addressed all 500 kV and 230 kV remote stations (zone 2 and zone 3) relaying and relay settings changed
• Replaced existing structures to accommodate the reconductoring of the tie line between substations

Performing extensive earth work, including rock blasting, clearing, grubbing, and grading. EDG installed gabion baskets to create retaining wall and facilitate substation’s current grade and elevation. Work also entailed cutting in access and site-specific roads—which included the installation and grading of different aggregate types.

• Installing and compacting lifts of aggregate for the finish surface/grade of the substation, within the fence
• Casted-in-place concrete foundations for all new electrical and steel structures
• Installing the following high-side and low-side equipment:
  • 33.6 MVA Conventional Transformer
  • 3700 KVA Substation Regulator
  • 2000 Amp Main Breaker
  • Five (5) Breaker Bays
  • Two (2) 1200-amp Feeder Breakers
• Creating underground exits for Distribution feeders from substation
• Establishing new 13.8 kV Distribution Line
• Clearing, grubbing, and surveying for new transmission line tie-in
• Adding new 115 kV transmission line
• Constructing chain-link fence around the immediate substation area for security
• Designing, procuring, and installing a custom, decorative fence to bring an architectural element to the project area
• Laying out and constructing concrete driveway and apron leading up to the substation

EDG provided Project and Construction Management services to raise and relocate transmission line assets to accommodate a highway widening project in Baton Rouge, LA.

Transmission Line Scope of Work:

EDG led the project from development through execution and closeout, managing a team of client and contract employees through scoping, design, and construction stages of the client’s project delivery system.

Key Project Scope Included:

• Due diligence to identify geotechnical and geographical properties of the areas for relocation
• Right of Way acquisition
• Long lead procurement
• Installation of 9 new steel structures
• Installation of direct embed, vibratory caisson, and drilled pier foundations
• Phase and sag verification
• Site restoration

Scope of Work

• 400 MW Peaker Plant to support local electrical grid
• EDG was responsible for all of the Balance of Plant (BOP) Engineering to include the HV Collector Bus

Project Highlights

• BOP Engineering Scope of Work
  • Entire site civil engineering
  • Entire site foundations and structural steel
  • Electrical including PDC and connecting all Power Units
  • P&IDs
  • Piping isometrics
  • 3D model for entire site
  • Instrumentation
  • 230kV collector bus design and engineering
  • Support for procurement of equipment
• Equipment
  • Raw water tank and pumps
  • Demin water tank and pumps
  • Wastewater pumps
  • Water treatment system
  • Backwash tank and pumps
  • Fuel gas knockout drum
  • Firewater system
  • Instrument air compressors
  • Building for water treatment, instrument air system, Demin Pumps, backwash pumps
  • PDC building