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GTD Infrastructure

The places where high-voltage power gets stepped down for delivery.

A substation is where transmission lines feed in, and the voltage gets stepped down so it can be sent to homes, businesses, and facilities. We build new substations from a bare site to a turned-on system, upgrade existing ones, and handle all the protection and control work that keeps everything safe. Every piece is done by our own people — no handoffs at the most critical moment.

Voltage
12.47 to 500 kV
Type
Open-air · Gas-insulated · Mobile
Our scope
Foundations · Steel · Controls
Build rate
9 substations per year
138/13.8 kV step-down substation
FIG— 03.A  ·  138/13.8 KV STEP-DOWN SUBSTATION

Substations, start to finish.

Both the open-air kind and the indoor type that uses special insulating gas. We handle the site work, the steel, the control building, the protection relays, the testing, and the moment the system goes live — all under one roof, all with the same signature on the final paperwork.
  • A

    New substations

    From siting through the day the substation goes live, we handle every step. Civil work, steel, the control building, the relays that protect equipment — all by our own crews.

  • B

    Upgrades to existing substations

    Adding new equipment to a substation that has to keep running is delicate work. We plan outages carefully and coordinate with the utility’s control room so customers see the smallest possible interruption.

  • C

    Protection and control systems

    The relays and controls that protect a substation are the most important — and most often subcontracted — part of the job. We keep this work in-house with our team of 24 engineers and technicians.

  • D

    Mobile substations

    A mobile substation is a complete substation on wheels. We deploy them for emergencies, planned outages, and bridge power. Our parent company also handles backup generation when needed.

How a project runs, step by step.

Every step happens inside one company — civil work, steel, electrical, and the controls that protect the system. All on the same payroll.
  1. 01

    Site work and foundations

    Clearing, grading, drainage, and oil containment (which catches any leaks from transformers). Then we drill or pour the foundations that will support every piece of equipment.

  2. 02

    Steel and grounding

    Setting the steel structures that support the wires and equipment, installing the lightning protection system, and burying the ground grid that keeps everyone safe during a fault.

  3. 03

    Equipment installation

    Receiving and assembling transformers, placing circuit breakers and switches, and setting the control building.

  4. 04

    Control wiring

    Pulling and connecting all the cables that link equipment to the relays and controls. Connecting to the utility’s remote control system.

  5. 05

    Testing

    Factory testing at the manufacturer, then on-site testing once everything is connected. We document everything for the operator who will run the substation for the next 30 years.

Common questions.

The questions we hear most often from utility engineers, federal contracting teams, and developers.

Have a substation project to plan?

We respond within two business days. For emergency, federal, and large industrial work, within four hours.

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