How Much Revenue Does an EV Charging Port Actually Make?

Write it out once and most of the confusion in this topic disappears. Net revenue per port per month equals energy revenue plus time revenue, minus energy cost, minus network subscription, minus payment processing, minus attributable demand charge, minus maintenance and replacement reserve.Every one of those terms is knowable before you install. Three of them come from your utility bill, two come from vendor contracts you have not signed yet, and one — delivered energy — is the only genuine unknown. That is a much better position than the industry convention of quoting a payback period, which buries all seven terms in a single number that cannot be checked.

A car connected for ten hours does not draw for ten hours. It draws until it reaches the state of charge the driver set or the battery is full, then it sits. On an overnight residential port a vehicle that needs thirty kilowatt-hours at 9.6 kW is done in a little over three hours and occupies the stall for the remaining seven.This is the single largest error in commercial charging proformas. Multiply your dwell window by charger power and you get a number that can be three times the energy you will actually sell. Model the energy the vehicles need, not the time they are parked.It is also the reason time-based pricing and idle fees exist. They convert those seven dead hours from a pure loss into either revenue or turnover, and they require a networked charger to enforce, which is a hardware decision taken long before the pricing decision. The pricing article in this cluster covers the instruments; the point here is that they change the revenue identity, not just the customer experience.

The table below runs two ports through the identity. Every number in it is invented for the purpose of showing the arithmetic — the price, the energy rate, the demand rate and the subscription are placeholders, not claims about what anything costs. Substitute your own and the shape of the result usually survives.Port A is a workplace port on a flat commercial rate with no demand component, delivering a modest twenty kilowatt-hours a day. Port B is a busier retail port delivering forty kilowatt-hours a day, on a tariff with a demand charge, where the chargers contribute to the site's monthly peak because nothing throttles them at the wrong time of day.The result is the point of the exercise. Port B sells twice the energy and nets less, because the demand term does not scale with energy sold — it scales with the worst fifteen minutes of the month.

Most commercial tariffs bill two things: the energy you consumed, in kilowatt-hours, and the highest sustained power you drew, in kilowatts, usually measured over fifteen-minute intervals. The second is the demand charge, and it is indifferent to how much energy you sold at that moment.Chargers set peaks efficiently because they are large, simultaneous and predictable. Four unmanaged Level 2 ports at 9.6 kW that all start when the shift ends add thirty-eight kilowatts to the site's draw at the exact moment the building is already at its own peak. Many tariffs also carry a ratchet clause, under which a peak set once continues to set a floor on the demand charge for months.This is the mechanism that turns a positive-margin port into a negative one, and it has a whole article of its own in this cluster. For the revenue calculation, the necessary discipline is simple: never model charging revenue without pulling your tariff and finding the demand rate, and never assume the chargers contribute zero to the peak unless something is actively preventing it.

Rearrange the identity instead of guessing. Take your fixed monthly costs per port — subscription plus maintenance reserve plus whatever demand contribution you cannot design away — and divide by your margin per kilowatt-hour. That gives the break-even kilowatt-hours per port per month, which converts directly into a daily delivery figure you can compare against what a port on your site could plausibly do.That comparison is worth running before you talk to a vendor, because it usually resolves the whole question in one line. If break-even requires forty kilowatt-hours a day and your dwell arithmetic caps a port at nineteen, you are in the amenity outcome and no pricing decision will move you out of it.Note that this calculation deliberately excludes the capital cost. Installed cost per port for networked Level 2 commonly runs $4,500 to $9,500, and $5,000 to $11,000 on lot pedestals where trenching dominates. Bringing capital into a break-even that has not yet cleared its own operating cost only obscures the result. Clear operating break-even first.

Delete any federal tax credit. Section 30C terminated for property placed in service after June 30, 2026 under Public Law 119-21, and there is no federal replacement for charging equipment. A proforma still netting thirty percent off the hardware and installation is overstating the return by an amount that regularly changes the decision.Utility make-ready contributions are a separate matter, are frequently much larger on a commercial project, and are real where they exist. They are also sponsored by named utilities with their own eligibility rules, application windows and funding status, so they belong in a per-utility lookup rather than as a national assumption in a spreadsheet.