alt Hacker NewsAt some point later I got around to playing with DC fast charging ... That market still has a long way to go as far as sorting out its business model, as billing based on time vs energy is completely unfair ... An excuse that's offered less and less often is that pricing by kilowatt-hours delivered is prohibited in some states by utility regulatory rules.
I didn't know they were billing for DC charging in the US based on Time instead of kwh. Thats odd. In Europe its just kwh.
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My understanding is that some US states have regulations against selling power by the kWh unless you are a registered power utility. This is an old regulation meant to be about landlords marking up electric rates to tenants etc.
Most states have updated their laws to account for EV charging providers, and in those states we pay per kWh.
Arguably it should be both. Sitting and occupying a DC fast charging booth, especially once you're not charging at the full rate, represents an opportunity cost since someone else could be using it.
Time based billing is almost completely eliminated. It was always state-by-state, due to local laws not being setup for dispensing of electricity as a business model.
I know Electrify America used to, but in recent years, I haven't come across any time-based chargers (but I haven't used a charger outside of Texas since 2022, so may be an issue in only certain states, as other comments have alluded to)
Later on ( https://techno-fandom.org/~hobbit/cars/ev/dcfc/app-problem.h... ) he talks about the app problem, and I believe the UK and possibly the EU are mandating that chargers must support contactless payment, so you can just do it with your regular bank card.
I've never paid by the minute. Tesla Superchargers often deliver less energy per minute when they're busy (sometimes much less!) and it would be frustrating if they charged per-minute.
Other systems I've seen (Chargepoint) also seem to be energy-based.
The Supercharger network is well done. It's a shame that they took this long to open up to other car models because they really do get a lot of things right.
It's almost all by the kWh here, but perusing PlugShare I've seen a few level 2 chargers here and there that charge by the minute. Usually that's a sign of a charger that was set up a while ago and is owned by someone who hasn't checked on it since.
I think fast chargers in rush hour times will also bill for time to discourage long/slow charges on them. Naturally that'll vary on whoever sets the costs, but it does exist in EU as well.
In some states, like Georgia, you are considered an electric company if you bill in kWhs. So some DCFC companies simply billed in the time equivalent. $0.30/min-$0.50/min.
In Europe, sometimes it's just kWh, other times it's kWh and time. After charging is done, it's just time.
> In Europe its just kwh.
In the EU, yes. When you go to those dark corners of Europe that never achieved the membership, all bets are off.
In Montenegro and Serbia they charge per minute because the only entity allowed to sell kwh's is the national electricity company (in Serbia it's owned by Russia, so it is heavily legally protected).