How Do EV Charging Stations Charge Customers?
Last updated: October 17, 2026
Unlike a petrol pump, there's no single way a charging station bills you. Each network
(and often each individual site) sets its own prices, and your final bill is usually a
mix of the energy you use plus a few extra fees. Knowing the building blocks makes it
much easier to compare networks and avoid surprise charges.
The main ways you're billed
Per kWh (energy used)
The most common and most transparent model: you pay for the electricity that actually
goes into your car, measured in kilowatt-hours. Because it tracks energy rather than
time, a slower-charging car isn't penalized. Typical public DC fast charging in the US
often lands somewhere around $0.35–$0.55 per kWh, while public AC (Level 2) is
usually cheaper, but rates vary widely by location and operator.
Per minute (time connected)
Some stations bill for the time you're charging instead. Per-minute pricing is simple for
the operator, but it means a car that charges slowly pays more for the same amount of
energy. To soften that, many networks use speed tiers: Tesla's
Superchargers, for example, use a four-tier per-minute system based on the power your car
is actually drawing (at or below 60 kW, up to 100 kW, up to 180 kW, and
above 180 kW), with higher tiers costing more per minute. Tesla bills per kWh where
it can and falls back to per-minute pricing elsewhere.
Per session (connection fee)
Some networks add a flat fee each time you start a charge, on top of the energy or time
charge. It's usually small, but it makes very short top-ups relatively more expensive.
Time-of-day pricing
Some networks, such as EVgo in the US, vary their per-kWh price depending on the time of
day, mirroring how electricity costs change between peak and off-peak hours.
Extra fees to watch for
- Idle (or overstay) fees — Billed per minute once your session ends but your car is still occupying the bay, usually after a grace period. They exist to stop drivers hogging chargers that others are waiting for, and they scale with how long you're away rather than with energy used. Grace periods and rates vary: one UK network applies overstay fees an hour after charging finishes, while some US networks start after 10–15 minutes.
- Congestion fees — Tesla also charges a per-minute congestion fee at busy Supercharger sites when your battery is above a high state of charge (around 80%), nudging you to unplug and free the stall.
- Pre-authorization holds — Some networks place a temporary hold on your card when a session starts (for example, a £25 or £30 hold at one UK operator). It's released when the session ends, though how quickly depends on your bank.
Memberships and subscriptions
Many networks offer an optional monthly plan that lowers your per-kWh or per-minute rate
in exchange for a fee. Tesla's Supercharging Membership, for instance, is listed at
$12.99/month in North America, and Electrify America's Pass+ has carried a monthly fee
in exchange for a 25% discount on charging. Whether a plan pays for itself depends on how
much you use public charging, and networks do reprice these plans, so it's worth
re-checking the maths occasionally. Pay-as-you-go is usually available with no monthly
fee, just at the standard (higher) rate.
How you pay
- Mobile app — Link a card to the network's app, then start and stop sessions from your phone. Often the cheapest route, since app users get the network's standard or member rate.
- Contactless card or phone — Tap a bank card or phone at the charger, no account needed. In the UK, rules in force since late 2024 require contactless on new public chargers above 8 kW and on existing rapid chargers (50 kW and above). Contactless can cost a bit more per kWh than app pricing, because it skips membership discounts.
- RFID card or key fob — A card issued by the network that you tap to unlock the charger and bill your account.
- QR code — Scan a code on the charger to open a payment page without installing an app.
- Plug & Charge — The car and charger authenticate each other automatically using certificates (based on the ISO 15118 standard), so billing starts the moment you plug in with no card, app, or tap. It needs both a compatible vehicle and a compatible charger, so availability is still limited.
- Roaming services — Services such as Octopus Electroverse or Zap-Pay in the UK give you one card or app that works across many different networks.
A worked example
Imagine a Level 2 stop at a grocery store priced at $0.25/kWh, a $0.25 session fee, and a
$0.10/minute idle fee after a 15-minute grace period. You add 10 kWh (energy:
$2.50), then leave the car plugged in for 35 minutes after it finishes, so 20 minutes
are billable (idle: $2.00). Total: $2.50 + $0.25 + $2.00 = $4.75. Note
that the idle fee cost nearly as much as the electricity itself. (Illustrative rates;
real prices differ by site.)
Practical tips
- Always check the price on the charger screen or in the app before you start — many networks use station-specific pricing, and it can differ from one site to the next.
- Compare the full cost, not just the headline rate: add any session fee, and check the idle-fee rate and grace period.
- Set a phone alert for when your session is nearly done so you can move the car before idle or congestion fees begin.
- If you charge publicly often, work out whether a membership discount outweighs its monthly fee at your usual usage.
- Keep a backup way to pay (an app or RFID card for your usual network, plus a contactless card) in case a charger's app or screen isn't working.
Sources
Want to compare charging specs across models? Browse the Electricarly spec database
to see connector type, max charging rate, and charge time for specific EVs. See also
How EV Charging Works for the basics of AC, DC and connectors.
