There is no honest answer to “which charging network is the most affordable” as a fixed ranking: public prices are set station by station and change over time. What decides your bill first is the billing unit. Some stations charge per kilowatt-hour delivered; others charge per minute connected — and on a per-minute station, your car’s charging speed sets the price you effectively pay per kilowatt-hour.
Key Takeaways
- “Most affordable network” has no fixed answer; prices are set per station and change. The billing unit is the first thing to compare.
- Per-kWh billing charges for energy; per-minute billing charges for time, so your car’s charging speed sets your effective price.
- Convert any per-minute price using your average charging speed, not the peak figure, before judging it.
- Session fees and idle fees can sit on top of either unit — read the whole price, not the headline.
Two Units, Two Different Bills
| Billing unit | What you pay for | What it means for you |
|---|---|---|
| Per kilowatt-hour | The energy delivered to your battery | Every driver pays the same for the same energy, fast car or slow. |
| Per minute | The time your car is connected | The slower your car charges, the more minutes each kilowatt-hour takes — and the more it costs you. |
The U.S. DOE’s AFDC guide to charging in public describes both structures, and both are common. Neither is cheaper in the abstract; each favours a different car. That, more than any network’s branding, is why DC fast charging prices are so hard to compare at a glance.
The Same 25 kWh, Priced Both Ways
Worked example with example prices — these are not any network’s real prices; run the same arithmetic with the figures on the screen in front of you. Two cars each take 25 kWh. Car A charges at an example average of 50 kW, so it needs 30 minutes. Car B averages an example 150 kW, so it needs 10 minutes:
| Car A (30 minutes) | Car B (10 minutes) | |
|---|---|---|
| At an example $0.30 per minute | $9.00 — an effective 36 cents per kWh | $3.00 — an effective 12 cents per kWh |
| At an example $0.40 per kWh | $10.00 | $10.00 |
On the minute-priced station, the identical energy costs one driver three times what it costs the other. On the energy-priced station they pay the same. The example uses average charging speed, not the peak on the label — the average is what the clock sees.
Why Networks Choose One or the Other
Per-minute pricing rewards turnover: a car that charges quickly and leaves frees the stall for the next driver, and the price structure says so. It also has a regulatory history — in a number of states, selling electricity by the kilowatt-hour was long treated as a utility’s business, so operators billed for time instead; those rules have been changing state by state, which is one reason both units survive side by side. Per-kWh pricing is easier to compare. Either way, the unit is the operator’s choice — on networked hardware such as the EV-AC03201T dual-connector AC station, which runs OCPP 1.6J, prices and billing are configured centrally, as our commercial charging page describes.
How to Compare Before You Plug In
- Read the unit before the number. A low per-minute price can be expensive for a slow-charging car; a higher per-kWh price can be the cheaper bill. The unit decides which.
- Convert with your average speed, not your peak. Divide the energy you plan to take by your car’s realistic average charging rate to estimate minutes, then multiply by the per-minute price.
- Count the other parts too. Some stations add a flat session fee once per visit, or an idle fee for staying plugged in after charging ends. The headline unit is not always the whole price.
- Use the pay-as-you-go price to compare. Corridor stations built to the federal NEVI standards take contactless card payment with no membership required, so you can compare networks without joining any of them first.
Frequently Asked Questions
Which billing unit is cheaper?
It depends on your car. Fast-charging cars usually do better per minute; slower-charging cars usually do better per kilowatt-hour. Run the example above with your own average speed and the two prices in front of you.
Can one network use both units?
Yes. Pricing is often set per station or region, so the same app can show per-kWh at one site and per-minute at another. Check each station’s price screen rather than assuming one structure.
How does this compare with charging at home?
At home there is no billing unit to decode: you pay your electricity tariff for the energy you use, at a U.S. residential average of 18.31 cents per kWh. The full comparison is in charging versus gasoline costs.
Related Reading
- Why Is DC Fast Charging So Expensive?
- How Fast Is a DC Fast Charger?
- How Many kWh Does It Take to Charge an EV?
- Is Charging an Electric Car Cheaper Than Gas?
