A neighbor with a new Model Y asked me a simple question last month. "Is it cheaper to just charge at the Supercharger near work, or should I bother with a home setup?" He had been Supercharging for three weeks because it was easy. Plug in, grab a coffee, drive off.
Then his first month of bills landed. The Supercharging had cost him more than three times what home charging would have. He did the math, ordered a wall charger that afternoon, and has not Supercharged in his own city since.
That gap between home and Supercharger is the single biggest cost lever you have as a Tesla owner. It is bigger than tire choice, bigger than driving style, bigger than almost anything else. So let's put real numbers on it, country by country, and figure out exactly when each one makes sense.
The one number that drives everything
Cost per kilometer comes down to two things. How much energy your car uses, and what you pay per kilowatt hour. Everything else is detail.
A Model 3 or Model Y in mixed real-world driving uses around 16 to 17 kWh per 100 km. Not the optimistic rated figure. The actual number you see over a full month with heating, traffic, and highway runs mixed in. We will use 16.5 kWh per 100 km as the baseline for every calculation below.
So the formula is short. Take 16.5, multiply by your price per kWh, and you get the cost to drive 100 km. Divide by 100 for per-km. That is it.
The reason home and Supercharger differ so wildly is not the car. It is the price per kWh. Home power is sold to you near cost. Supercharging is a roadside service with infrastructure, land, and convenience baked into the price.
United States
Home electricity in the US averages around 16 cents per kWh for residential customers. But most Tesla owners on a dedicated EV plan charge overnight for a lot less. Off-peak rates of 10 to 13 cents per kWh are common if you set the car to start after midnight.
Superchargers in the US vary by location and time of day. The average sits around 40 to 48 cents per kWh, and peak-hour pricing in busy metros climbs higher. Here is how that plays out per 100 km.
| Charging method | Price per kWh | Cost per 100 km | Cost per km | |---|---|---|---| | Home, off-peak overnight | $0.12 | $1.98 | $0.020 | | Home, standard rate | $0.16 | $2.64 | $0.026 | | Supercharger, average | $0.44 | $7.26 | $0.073 | | Supercharger, peak metro | $0.55 | $9.08 | $0.091 |
For someone driving 1,500 km a month, that is roughly $30 charging at home overnight versus $109 Supercharging at average rates. Over a year the gap is close to $950. That pays for a home wall connector and the install, with money left over.
United Kingdom
The UK has the widest spread of any country here, and it is all about the overnight EV tariff. Standard home electricity runs around 28 pence per kWh. But smart EV tariffs drop to roughly 7 pence per kWh for a set window overnight, usually a few hours after midnight.
Tesla Superchargers in the UK price in the range of 45 to 55 pence per kWh, depending on site and membership.
| Charging method | Price per kWh | Cost per 100 km | Cost per km | |---|---|---|---| | Home, overnight EV tariff | £0.07 | £1.16 | £0.012 | | Home, standard rate | £0.28 | £4.62 | £0.046 | | Supercharger, average | £0.50 | £8.25 | £0.083 |
Look at the top and bottom rows. Overnight home charging in the UK can be seven times cheaper than Supercharging. That is the largest ratio on this entire page. If you are a UK owner and you are not on a smart overnight tariff, that is the first thing to fix. It dwarfs every other saving.
Germany
Germany has expensive home power and expensive Superchargers, so the absolute numbers are high, but the ratio is gentler than the UK. Residential electricity sits around 35 cents per euro per kWh. Dynamic and overnight tariffs exist but the discount is smaller than in Britain.
Superchargers in Germany run around 50 to 60 cents per kWh.
| Charging method | Price per kWh | Cost per 100 km | Cost per km | |---|---|---|---| | Home, standard rate | €0.35 | €5.78 | €0.058 | | Home, dynamic off-peak | €0.28 | €4.62 | €0.046 | | Supercharger, average | €0.55 | €9.08 | €0.091 |
The German takeaway is different. Home is still clearly cheaper, but because base power costs so much, the savings from charging at home are smaller in relative terms. A German owner saves money by driving efficiently, not just by choosing where to plug in. Both levers matter here.
Turkey
Turkey is where this gets interesting, because the tariff structure rewards planning more than almost anywhere. Residential electricity uses a tiered system. There is a lower price for the first block of monthly consumption and a higher price once you cross it. Heavy EV charging at home can push a household into the upper tier fast.
There is also a three-time tariff option, the çok zamanlı tariff. It splits the day into daytime, peak, and night. The night window, roughly 22:00 to 06:00, is meaningfully cheaper. For a Tesla owner who charges overnight anyway, switching to this tariff is often free money.
Using a blended residential rate of about 3.0 TL per kWh, and a Supercharger rate around 9 TL per kWh, here is the picture.
| Charging method | Price per kWh | Cost per 100 km | Cost per km | |---|---|---|---| | Home, night tariff | ₺2.20 | ₺36.30 | ₺0.36 | | Home, blended residential | ₺3.00 | ₺49.50 | ₺0.50 | | Supercharger, average | ₺9.00 | ₺148.50 | ₺1.49 |
The Supercharger sits at roughly three times the cost of blended home charging, and four times the night tariff. For a Turkish owner driving 1,500 km a month, that is the difference between about 545 TL and 2,228 TL. Every month. The night tariff plus a home wall box is the cheapest motoring most Turkish drivers will ever see.
The hidden costs nobody quotes you
The tables above use the sticker price per kWh. Real life adds a few quiet costs on top, and they almost all push Supercharging higher, not lower.
Charging losses are real
You pay for energy at the plug, not energy in the battery. Some is lost as heat. Home AC charging at 7 to 11 kW loses around 8 to 10 percent. DC fast charging at a Supercharger is more efficient per session at the cable, but the battery has to run its cooling system hard, and that pulls energy too. The net effect is that your real cost per usable km is a few percent higher than the sticker math, more so in hot weather.
Preconditioning burns energy before you even arrive
When you navigate to a Supercharger, the car warms or cools the battery on the way so it can accept full power. That preconditioning can use 2 to 4 kWh on a cold day. It is energy you paid for, spent before the charging session starts. Home charging never needs it.
The taper tax on time
Superchargers slow down a lot past 80 percent. Charging the last 20 percent can take as long as the first 80. If you are paying by the minute at any third-party DC charger, or you simply value your time, that slow tail is a real cost. We wrote about why this happens in detail, and the short version is that battery chemistry forces the taper. Home charging does not care. It trickles in overnight while you sleep, so the speed never matters.
Cold weather stacks on top
Winter raises every number in every table. The cabin heater, the battery heater, and denser cold air all cut efficiency. Real consumption can jump from 16.5 to over 21 kWh per 100 km in deep cold, which raises cost per km proportionally no matter where you charge. Cold weather hits your charging bill just as hard as it hits your range.
Solar changes the entire equation
If you have rooftop solar, the home column gets even better, and sometimes drops to near zero. Daytime charging straight from your panels can cost you almost nothing beyond what you already spend on the system.
The catch is timing. Solar produces during the day, and most people charge at night. If you work from home or can leave the car plugged in during daylight, you capture that free energy. If your car is at the office all day, you cannot, and you fall back to grid rates. A simple timer that charges midday on sunny days, and overnight otherwise, captures the best of both.
Even a partial solar offset shifts the math hard. A household covering half its charging from panels and half from a night tariff lands at an effective cost most Supercharger users would not believe.
So when is the Supercharger actually worth it?
Supercharging is not a mistake. It is a road-trip tool that got misused as a daily habit. Here is the honest breakdown of when it earns its price.
- Long trips. On a 600 km drive you have no choice, and the convenience is the entire point. Pay it gladly.
- No home charging access. Apartment dwellers without a plug are a real case. For them the comparison is Supercharger versus a slower public AC charger, not versus home.
- Genuine emergencies. Low battery, far from home, need range now. That is exactly what the network is for.
- Free or bundled credits. If you have referral miles or promotional credit, use them.
What does not make sense is Supercharging in your own city, a few km from a wall outlet you could install, just because it is slightly more convenient this week. That convenience costs three to seven times the price, every single time, forever.
Run your own numbers
The figures here are national averages, and your real rates will differ. The honest way to decide is to plug in your own price per kWh and your own monthly distance. We built a charging cost calculator that compares a home-heavy mix against a Supercharger-heavy mix and shows you the monthly and yearly gap in your own currency. It takes about a minute.
It also pairs with the bigger ownership picture. Heavy Supercharger reliance is not only more expensive per km, it nudges long-term battery degradation in the wrong direction over many years. Cheaper and gentler tend to point the same way.
If you want the running tally without doing the spreadsheet yourself, that is part of what we are building Volt to do. You ask it where your money went this month, and it answers in plain language, home versus Supercharger, with your real tariff baked in. No dashboards to read, just the answer. You can see what we are building at Volt.