Key takeaways
- Commercial EV charging cost and incentives both depend on your site: the service capacity, the distance to the parking spaces and what the utility has to do.
- The chargers are often not the largest part of the price. Trenching, feeders and service work can outweigh them.
- A load study comes first, because it decides whether the chargers fit on the service you have or need an upgrade.
- Incentive programs change. Check current programs from the utility and the state before you plan around one, and get the terms in writing.
Commercial EV charging cost and incentives are the first two questions most businesses ask, and both have the same honest answer: it depends on the site. Two properties can install the same number of the same chargers and end up with very different totals, because most of the cost sits in the electrical work between the service and the parking space. This guide walks through what drives the price, in the order the work actually happens, and how to approach incentives without building a budget on a program that may change.
If you are still deciding whether charging makes sense for your property, start with our overview of EV charging for businesses and fleets. This post picks up once you are pricing the work.
The load study comes first
Before anyone can price a charging project, someone has to know how much capacity the building's service has left. A load study looks at the service size and the actual demand the building puts on it, using the utility's demand records or measurements taken over a period of time. The answer decides everything after it. If there is room, the chargers can be fed from the existing service. If not, the project includes a service upgrade or a separate service, which changes the cost and the schedule more than any other single item.
A load study also tells you how many chargers you can add later without starting over. Planning for future spaces now, even if only some chargers go in this year, usually costs less than coming back to dig and upgrade a second time.
Service capacity and utility work
When the service has to grow, part of the work is on the utility side. In most of the San Antonio area that utility is CPS Energy. The utility decides what it needs to provide, such as a larger transformer or a new service, and it sets its own schedule and its own charges. The electrical contractor coordinates the application, the equipment on the customer side, and the timing of the cutover.
That process is the same one any growing building goes through, and our guide to a commercial electrical service upgrade explains it step by step.
Distance, trenching and feeders
The distance from the electrical room to the parking spaces is often the biggest variable a business owner does not think about. Every foot of distance means conductor and conduit, and conduit in a parking lot usually means cutting and patching pavement or trenching through landscaping. Longer runs may also need larger conductors to keep the voltage drop in check. Choosing charger locations close to the power, where the layout allows it, is one of the most effective ways to control cost.
- Spaces near the building and the electrical room cost less to serve than spaces at the far end of the lot.
- Wall mounted chargers on a building or a garage column avoid most trenching.
- Pavement cutting and patching, and any landscaping repair, belong in the bid.
- Conduit for future chargers is cheapest to install while the trench is already open.
The chargers themselves
Level 2 chargers serve workplaces, retail and overnight fleet parking well. DC fast chargers deliver much more power and need much more from the service, which is why they are usually reserved for sites where vehicles must turn around quickly. Networked chargers that track use, control access or bill drivers carry ongoing software and service plans in addition to the hardware. The choice between charger types should follow the load study and how the vehicles are actually used, not the other way around.
Our EV and fleet charging page covers how we plan Level 2 and DC fast charging for workplaces, retail and fleet yards, and the EV charger installation page covers the home side.
Managing load instead of adding service
Not every charging project has to end in a service upgrade. Many chargers can share a circuit's capacity, slowing down when several vehicles charge at once and speeding up when fewer do. Some systems also watch the building's own demand and hold the chargers back during the hours when the building already draws the most. These load management approaches can let a site add more charging ports on the service it has, at the cost of slower charging when demand is high.
Whether that works depends on how the vehicles are used. Employees who park for a full workday can usually charge slowly and still leave with what they need. A fleet that has to turn vehicles around between shifts may need full power at specific times, which changes the answer. The load study and a conversation about how the vehicles are actually used decide which approach fits.
A realistic timeline
A charging project moves through a predictable order: the site walk and load study, the design and the charger choice, the utility application where the service has to change, the permit, equipment ordering, the installation and trenching, the inspection, and finally commissioning of the chargers. The steps that involve the utility and equipment lead times usually take the longest. Planning the order up front, and starting the utility conversation early, keeps the chargers from sitting unpowered in the parking lot.
- Site walk and load study.
- Charger choice and layout.
- Utility application, where the service changes.
- Permit and equipment ordering.
- Installation, trenching and restoration.
- Inspection and charger commissioning.
Permits, inspection and code
Commercial EV charging installations need an electrical permit. Inside the city, it goes through the City of San Antonio Development Services Department, and the suburban cities have their own permit offices. The 2023 National Electrical Code, which San Antonio adopted effective May 1, 2025, covers electric vehicle power transfer systems in Article 625. Plans may be required for larger projects. The permit, the inspections and any required drawings should be named in the bid so they do not appear later as extras.
How to approach incentives
Incentive and rebate programs for commercial charging come and go, and their rules change. Some come from utilities, some from the state, and some from federal programs. Before you plan around any of them, check current programs from the utility and the state, read the eligibility rules and the deadlines, and get the terms in writing. Many programs require approval before the work starts, specific equipment, or reporting after installation, and missing one step can cost the incentive.
- Check current programs from the utility and the state before signing a contract.
- Find out whether approval is needed before work begins.
- Confirm which charger models and installation requirements qualify.
- Keep invoices, photos and permit records in case the program asks for them.
- Budget the project so it still makes sense if an incentive does not come through.
Reading a bid for commercial charging
A clear bid separates the parts: the load study, any service or utility side work, the feeders and trenching, the chargers, the permit and inspection, and the restoration of pavement or landscaping. It says who supplies the chargers and who commissions them. At Wattsmith, every job gets a written bid that names those lines, and any change gets a written price and your approval before the work is done.
For the rest of what we do for businesses, see our commercial electrical services page.