Fleet DepotsA depot is easy to describe and slow to build. A fleet needs somewhere to park, charge and reset vehicles. The hard part is getting enough electrical power to that spot. This article walks through what sets the clock for a fleet depot buildout, and what you can do to start it early.
Power is the first question
The EV Fleets Pro Academy guide, quoting a BC Hydro account manager, says the most important planning question is whether the site has enough electrical capacity for the charging load. At the simplest level, an electrician compares what the site uses now with what it has available. The difference may be enough for a first phase of charging.
Bigger plans change the picture. The same guide says that installing DC fast chargers delivering anywhere from 24 kW to 350 kW may mean upgrading the electrical service, with planning, permitting and possibly a new transformer or a tie-in to the utility's lines. It tells readers to allow 12 to 24 months to build out a project of that scale.
The utility sets the pace
A January 2025 report from Idaho National Laboratory, prepared for the U.S. Department of Energy's Joint Office of Energy and Transportation, says high-powered charging stations typically need a load service request or an agreement with the local utility. It says energizing a new high-powered site can be complex and often takes up to 2 years. The authors point to utility processes designed for slower construction projects such as buildings.
What goes into the timeline
| Step | What it involves |
|---|---|
| Capacity check | An electrician compares current use with available capacity and estimates the added load. |
| Utility request | A load service request or agreement. The utility returns a design brief with an estimated timeline and cost. |
| Design and permits | Site survey, electrical and mechanical drawings, equipment specifications and layouts. |
| Construction | Underground work, transformers and equipment. Crossing roads or other utilities adds time. |
| Energization | The utility connects the new service. |
The EV Fleets Pro Academy guide lists engineering documentation, a site survey, drawings, hardware specifications, layouts, an overview of underground work and property agreements as things to have ready. It warns that pausing a project to complete or update these items can cause delays and cost increases.
How to start the clock early
- Ask for the capacity answer first. It tells you whether you are planning a small first phase or a service upgrade.
- Call the utility early. The guide quotes BC Hydro advising customers to reach out early and often.
- Have the paperwork ready. Drawings, site survey and property agreements sit on the critical path.
- Plan in phases. If capacity allows a first phase, start there while the larger upgrade is processed.
What this means for picking a site
For an operator choosing between sites, available power is worth checking before anything else. For a property owner, knowing your electrical service and utility is the most useful thing to bring to a conversation. The same site on paper can differ by many months depending on its power.
One note on sources: the EV Fleets Pro Academy guide is from 2023 and includes Canadian utility examples. Timelines vary by utility and region.
Frequently asked questions
How long does a fleet depot buildout take?
It depends on how much new power the site needs. Sources put a large DC fast charging project at 12 to 24 months and a new high-powered charging site energization at up to 2 years.
What slows a depot buildout down most?
Usually the utility. Energizing a high-powered charging site means a load service request or agreement with the local utility, and a report from Idaho National Laboratory notes these processes were designed for slower construction projects such as buildings.
Can a site start with less power?
Sometimes. The EV Fleets Pro Academy guide says the delta between current use and available capacity may cover a first phase of charging, which an electrical contractor can check.
Sources
- EV Fleets Pro Academy, "Depot charging, phase 2: Powering up" (May 30, 2023): evfleets.electricautonomy.ca/topics/depot-charging-powering-up
- Idaho National Laboratory, "EV Charging Infrastructure Energization: An Overview of Approaches for Simplifying and Accelerating Timelines to Processing EV Charging Load Service Requests," INL/RPT-24-82618 (January 2025): osti.gov/servlets/purl/2502100