You're paying
full price to charge.
You don't have to.
Every charge is a cost you could be cutting — or eliminating entirely. With 10s, your car charges automatically when electricity is cheapest, or negative. The grid does the work. You just plug in.
€264
8.2%
96
48h
Three reasons your current setup is costing you more than it should
Standard energy contracts were designed around the grid of twenty years ago. ...The market has moved on.
1. You're charging at the wrong time
Most EV owners charge overnight on a schedule — which sounds smart, but overnight isn't always cheap. The actual cheapest windows shift daily based on wind, solar output, and industrial demand. Without real-time data, you'll miss them every time.
2. Day-ahead pricing is already stale
Dynamic tariffs publish tomorrow's prices at 3pm today. That forecast becomes less accurate as the day evolves — a cloudy morning, a drop in wind, a factory shutdown. By the time your charger acts on a day-ahead price, the real price has moved. You're always one step behind.
3. Negative prices don't reach you
In 2024, the Belgian grid had negative prices for more than 8% of quarter-hour intervals. That's the market paying you to use electricity. On a fixed or standard dynamic contract, those windows are invisible to your charger. You just pay the standard rate and move on.
Your charger deserves a better signal.
Most smart chargers are clever devices waiting on a dumb price signal. 10s gives them the live market data they were built for — prices that update every 15 minutes, direct from Elia.
Feature
Fixed / standard dynamic
10s Energy
Price update frequency
Negative price windows
Charging schedule
Departure time guarantee
Switch to urgent charge mode
Savings vs fixed contract
Visibility of every charge cost
Every 60 min
Not accessible
Manual time-based
Set by you manually
Always on regardless
None
Monthly bill total only
Every 15 min
Fully captured — you earn
Automatic — price-triggered
Set once — always honoured
48h switch between smart / standard
~€264/yr on typical setup
Per quarter-hour in dashboard
Sometimes, the grid pays you to charge
When there's too much wind or solar on the Belgian grid and not enough demand, market prices go negative. That happened for more than 8% of quarter-hours in 2024. With 10s and Home Assistant, your charger automatically switches on at exactly these moments. Instead of paying to charge, you get credited. Your car is the battery the grid needed.
Simple to set up.
Runs itself after that.
You set your rules once. 10s and Home Assistant handle the rest — every charge, every quarter-hour, automatically.
Connect your charge point
Link your home charge point to Home Assistant. Compatible with Wallbox, Zappi, Easee, Alfen, and 100+ other models. No electrician needed — just a Wi-Fi connection and 5 minutes of setup.
Set your rules once
Tell 10s your preferences: when you need the car ready, your minimum charge level, and your price threshold. Example: charge whenever the price drops below €20/MWh, and always have 80% by 7am. Done.
Charge cheaply — automatically
From here, your setup runs without you. Your charger responds to live quarter-hour prices, catches negative-price windows, and always has your car ready when you need it. Check your savings in the 10s dashboard.
Ready to earn more
from your solar?
Join the Early Bird waiting list. You'll get VIP access to the 10s launch tariff before anyone else — and a better rate locked in from day one.
Testimonials
Check out what our BETA users have to say
I plugged in on a Wednesday evening and by Thursday morning the car was full. I paid almost nothing. There had been a wind surplus overnight and the price went negative for nearly three hours.
I used to set a timer for 1am because I thought that was smart. I had no idea what prices were actually doing at 1am. Now the charger decides, not me, and my bill shows it.
Long trip on Friday, needed a full charge by 6am. Set it in the app, went to sleep. Car was at 100% by 5:30, the system had found three cheap windows overnight. I didn't have to think about any of it.
EV charging savings calculator
Indicative estimate only. Based on 2024 Elia CWE annual average pricing data and CREG reference tariffs. See full disclaimer below.
⚠ Indicative estimate only. Not a contractual offer or guarantee. Standard fixed tariff energy component: €0.088/kWh (ex grid, ex VAT) — CREG residential benchmark 2024. 10s Smart rate calculated from 2024 Elia day-ahead averages (avg €0.080/kWh, bottom-quartile €0.028/kWh) with 88% shiftability factor and 10s supplier margin (€0.010/kWh). VAT 21% applied throughout. Charging efficiency losses not included (~10–15% for AC charging). Actual savings depend on your Home Assistant configuration, charger compatibility, and real-time market conditions. Past pricing patterns are not a guarantee of future prices.
A smart supplier that really means it
Everything you need to know about smart EV charging with 10s
01. What charger brands does 10s work with?
10s works via Home Assistant, which supports over 100 charge point brands including Wallbox, Zappi, Easee, Alfen, ABB, and most other OCPP-compatible models. If your charger is already connected to Home Assistant — or can be — you're compatible. If your charger itself can't be controlled directly, many modern EVs can be managed via the car's own Home Assistant integration (Tesla, BMW, Volkswagen Group, and others are fully supported).
02. What if I need a full charge by a specific time?
You stay in full control. Set a departure time and a minimum charge level — for example, 80% by 7am — and the system works backwards to find the cheapest windows that still guarantee your car is ready. If cheap windows aren't available, it charges at whatever time is needed to meet your deadline. You're never left with a flat battery because the price was wrong.
03. Can I switch to normal charging when I need to?
Yes. You can switch any appliance — including your EV charger — between the smart imbalance tariff and a standard dynamic tariff at any time, with a 48-hour notice period. Heading on a long trip and want to be sure the car is fully charged regardless of price? Switch to standard, charge normally, switch back when you return. No penalties, no drama.
04. What happens when prices run negative? Does my charger run automatically?
Yes — if you've set it up that way. You can configure Home Assistant to start charging automatically whenever the price drops below a threshold you choose, for example €0/MWh or even −€20/MWh. When those windows hit, your charger switches on, charges at that price (or earns a credit if negative), and switches off when the price rises above your threshold again. You set the rules once; the system handles the execution in real time.
05. Does 10s control my car or charge point?
No. 10s never controls your devices directly. We supply real-time price signals to your Home Assistant setup. Your Home Assistant uses those signals to execute the rules you've set. You remain 100% in control of your own system at all times. If you want to override anything — manually start a charge, pause it, change the rules — you do that through your own Home Assistant interface.
06. Is this based on imbalance price or day-ahead prices?
10s uses Elia's real-time imbalance prices — the actual quarter-hour market price, not a day-ahead forecast. You can also configure your Home Assistant to use price predictions (forecasts) if you prefer a more conservative approach, or combine both: optimise against predictions overnight, then react to real-time prices during the day. The choice is yours.
07. Can this work along side solar panels?
Beautifully, if you have both. During the day, your Home Assistant can prioritise using your own solar output to charge the car — free energy from your own roof. When solar isn't available, it falls back to the cheapest grid windows. And when grid prices go negative, it may be cheaper to charge from the grid than to use your own solar, depending on your injection rate. 10s helps you navigate all of those trade-offs automatically.