Power Transmission, Distribution, and Substations

Whether developing new infrastructure or rehabilitating and replacing existing systems, we are ready to meet the power industry’s need for resilient and efficient facilities. Gannett Fleming understands what it takes to improve power infrastructure because we’ve been helping power and industrial clients reshape the power transmission grid for more than 80 years.

Transmission & Distribution

Gannett Fleming offers efficient, reliable design solutions for system optimization, expansion, and replacement.

Our team employs advanced technologies and creative problem-solving to meet all types of electric power needs. As a multi-discipline firm, we offer a consolidated suite of services, from asset management to construction services. We also offer in-depth design of related facilities for stand-alone building and MEP projects. We can educate your in-house team with customized training courses and services that help you meet environmental regulations.

We partner with you to provide services such as:

  • Energy management.
  • Electrical studies.
  • Air quality analysis.
  • Heating, ventilation, and air conditioning (HVAC) and plumbing design.
  • Modeling.
  • Training.
  • Programming.
  • Plant evaluation.
  • Inspections.
  • Plans for projects that involve rehabilitation, expansion, new construction, or process changes, including sustainable and resilient design.

In short, whatever your needs, our professionals are equipped to help you assess, design, deliver, monitor, and protect your organization’s power infrastructure.

At the core of our services is power engineering for substations, transmission, and distribution systems. We have experience with storm hardening to incorporate resiliency measures intended to withstand weather challenges and protect assets. Our services include:

  • New & expanded substations.
  • Equipment replacement.
  • Gas Insulated Systems (GIS).
  • Relay upgrades.
  • Supervisory control and data acquisition (SCADA) & communication systems.
  • Overhead & underground transmission & distribution systems.
  • Power studies & relay settings.
  • Routing studies & permitting.

Power Transmission

We understand the latest transmission technology and deliver cutting‐edge transmission system design to power companies, industrial clients, and rapid transit providers. We are knowledgeable about the engineering and design requirements needed to successfully complete transmission projects as well as the environmental and permitting requirements required when working with overhead and underground transmission lines.

Our engineers can provide efficient, reliable design solutions for system optimization, expansion, and replacement, from routine distribution projects to unique challenges. Whether your transmission project is in the planning stage or ready for construction, our engineers and project managers are here to offer expert guidance.

Power Distribution

Utility customers demand reliable services. From routine distribution projects to unique challenges, our engineers can provide efficient, reliable design solutions for system optimization, expansion, and replacement. Our distribution expertise is built on extensive field experience, including overhead and underground distribution replacement projects, so you can rely on us to create practical, real‐world designs that meet your project objectives.

Power Substations

Substations are a critical component of the power distribution system. Gannett Fleming understands the measures required to improve this infrastructure, and has an extensive history of providing full substation design, upgrade, and expansion services.

We have an extensive history of providing full design, upgrade, and expansion services to substations. Our team is familiar with all aspects of substation engineering from relay and control measures and analytical services to the design of structural modifications, site work, and permitting. Our experience includes construction services for substation upgrades, reconstruction, and replacement. Our modern approach ensures the latest technology for resiliency and security are integrated into your project. Our substation design work ranges from 69 kV to 345 kV.

Our substation services include:

  • AC/DC station power.
  • Air & gas insulation.
  • Arc flash studies (NFPA-70E).
  • Blast wall design.
  • Circuit breaker (SF6, OCB) replacements.
  • Communication systems interface & fiber optic systems.
  • Geotechnical evaluations.
  • Grading & grounding plans.
  • Major equipment & construction specifications.
  • Operating manuals & commissioning.
  • Outdoor enclosed switchgear.
  • Physical design & layout.
  • Protective relay design & modifications.
  • Site acquisition, selection, & grounding.
  • Structural foundations & fabrication details.
  • Substation automation & SCADA systems.
  • Transformer replacements.

Utilities face enormous pressure to:

  • Maximize profits.
  • Upgrade aging infrastructure.
  • Incorporate new energy sources.

Industrial companies are in a race against time to route necessary power to projects while market prices support expansion. As the power market evolves, our team can help you:

  • Meet market challenges.
  • Manage demand.
  • Guide you through rigorous safety, reporting, and environmental requirements.

Our team handles projects of all sizes, from small design tasks to total project delivery. We customize our scope of services and draw on seasoned experts to maximize value for each project. When it comes to project delivery, Gannett Fleming has an excellent track record of teaming with contractors to provide complete engineering, procurement, and construction (EPC) and design-build services. No matter the application, we have the ability to handle large-scale power projects and meet system reliability and performance goals.


Are you looking for a reliable, collaborative partner? Do you have a planning, design, or construction challenge? We want to hear from you.


Are you looking for a reliable, collaborative partner? Do you have a planning, design, or construction challenge? We want to hear from you.

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