Turnkey Power Delivery and Maintenance Solutions

Expanse provides Engineering, Procurement, and Construction of electrical substations and switchyards. We are a single-source provider for the lifecycle of our clients’ systems – from site preparation to energization, and beyond. We have a long and successful history in the High Voltage market delivering value to the Utility and Industrial markets. Our significant experience can be mobilized for successful project execution.

Why Expanse

Providing Turnkey Solutions for Greenfield and Brownfield Power Delivery

Expanse provides complete transmission and substation EPC services for construction projects from 34.5kV up to 345kV safely and on schedule. Whether constructing greenfield projects from the ground up and/or brownfield expansion and upgrades, we provide turnkey power solutions from site preparation through energizing with an emphasis on:

  • Human performance advancements in safety, quality and construction accuracy
  • Meeting timeline and budgets through proper project and program management
  • Using design engineering controls to remove barriers and eliminate unnecessary project pressures and safety risk
  • Developing project-specific tactics to eradicate job site complacency
Why Expanse

Ensuring Safe Power System Operations Through Planned Maintenance

Expanse delivers predictive and preventative maintenance services to ensure continual safe operation of power transmission and electrical substations. Our solutions include equipment testing, inspection, repair and replacement, facility maintenance inspections and emergency restoration.

  • Verify the security of existing systems and equipment
  • Discover issues prior to negative outcomes
  • Correct any deficiencies before they impact high voltage, medium voltage and low voltage transmission, distribution and electrical substations
  • Set ongoing plan to maximize maintenance efficiencies
Why Expanse

Verifying Power Equipment Integrity and Security

Expanse’s testing solutions verify the integrity and security of new and existing systems and equipment. Our goal is to proactively support our clients to avoid outages and unnecessary damage.

  • Verify electrical equipment was installed safely as designed and intended per applicable codes and standards
  • Establish a baseline of equipment operations for future reference
  • Verify the integrity of new and existing equipment
Contact Us

Connect with an Expanse Expert


Power Delivery Engineering and Design

  • Conceptual/Preliminary Engineering
  • Standard and Specification Development
  • Drafting
  • Routing Studies
  • Grounding System Survey
  • New Line Design
  • Structural Analysis
  • Equipment and Material Procurement/Expediting
  • Feasibility Studies
  • HV, MV, and LV Switchgear Services
  • Uprating Analysis and Design
  • Storm Hardening
  • Program Management
  • Human Performance Tool Design
power design

EPC Services

  • Right of Way Services
  • Site Optimization
  • Lifecycle Cost Analysis
  • Environmental Studies
  • Permit Acquisition
  • Schedule Development
  • Landowner Interaction and Communication
  • Design Criteria Definition
  • Conceptual Estimates
  • Surveying
substation preconstruction in the field

Electrical Substation Construction

  • Full Turnkey Civil Construction, Required for Substation Brownfield and Greenfield Projects
  • Ground Grid Installation
  • Transformers
  • Trenching
  • Switch Change Outs
  • Oil Containment System Construction
  • Cutting-in of Transmission Lines
  • Bus Work
  • Grounding of all Equipment and Fencing
  • Panel Change Outs
  • Steel Erection
  • Conduit Installation
  • Cable Installation and Wiring
  • Breaker Change Outs
  • Installation of Control House and Required Equipment and Wiring

Electrical Substation Maintenance

  • Environmental Mitigation and Compliance
  • Storm Hardening
  • CT/PT replacement
  • Substation Battery Maintenance
  • 24/7 Emergency and Storm Response
  • Reconductoring of Existing Transmission Lines
  • Foundation Rehab
  • Wiring Replacement
  • Switchgear and Bus Duct Cleaning
  • Pole Changeouts
  • Breaker/Relay Repair and Replacement
  • Switch Adjustments
  • Complete Transformer and LTC Maintenance and Repair Services

Electrical Substation Inspection and Testing

  • Annual, Quarterly and Monthly Maintenance Program Inspections
  • Oil and Gas Analysis and Leak Detection
  • Protective Relay Testing and Calibration Including Electromechanical, Solid State and Microprocessor
  • EHV, HV, MV and LV Circuit Breaker Testing
  • System and Equipment Fault Analysis Power System and Disturbance Monitoring and Analysis
  • Substation Battery Inspections
  • Substation Apparatus Testing Including Transformers, VTs, PTs, CCVTs and Arresters
  • Meter Calibration
  • Grounding Systems Testing and Analysis
  • Acceptance Testing and Commissioning
  • Infrared Surveys and Analysis
  • Switchgear and Bus Duct Inspection and Testing
  • Motor and Generator Testing
  • HV, MV and LV Cable Testing and Fault Locating
substation testing
More Information

Resources At Your Fingertips

Substation Capabilities Brochure

Substation Capabilities Brochure

Transmission and Substation Construction Brochure

Transmission and Substation Construction Brochure

Transmission and Substation Maintenance Brochure

Transmission and Substation Maintenance Brochure

Electrical Field Services Brochure

Electrical Field Services Brochure

ARC Flash Brochure

arc flash requirements brochure