Smart energy
How It Works
Smart energy use starts with knowing what you’re paying.
That’s where 10s Energy comes in.
Two pricing models
Same idea, very different potential
Daily rates (standard dynamic contracts)
With most dynamic contracts, prices update once per hour. You receive the full price list the day before—usually around 15:00—so you can plan ahead.
That means you can shift usage to cheaper hours: run your washing machine at night, or avoid peak times like early evening.
Useful—but still limited.
Real-time pricing (Elia) - the 10s approach
With 10s Energy, prices update every 15 minutes based on real-time market conditions.
You first see an estimated price, followed shortly by the confirmed price from Elia. This gives you a far more precise view of what’s actually happening in the market.
And here’s where it gets interesting:
When prices drop below -20 €/MWh, you’re no longer paying—you’re earning. Charge your car, run your appliances, and get paid to do it.
That’s not just planning ahead. That’s reacting at exactly the right moment.
This calculator gives you a realistic estimate of what your electricity bill could look like — but it's exactly that: an estimate. The figures are based on Belgian reference tariffs and typical household profiles, and your actual bill will depend on your specific consumption patterns, the grid operator in your area, your supplier's contract terms, and real-time market prices at the time you use energy.
Tariff components — particularly distribution network rates and federal levies — are updated annually and may have changed since this calculator was last refreshed.
The 10s Smart savings shown are modelled on typical smart load-shifting behaviour and are not a guarantee of the saving you'll achieve. We'll give you a precise, personalised quote when you sign up.
Smart Energy Management
Get paid to use electricity
Tap into real-time energy tariffs and charge your appliances when prices are lowest—or even negative. Save money automatically, or make money while you power your home.
This calculator gives you a realistic estimate of what your electricity bill could look like — but it's exactly that: an estimate. The figures are based on Belgian reference tariffs and typical household profiles, and your actual bill will depend on your specific consumption patterns, the grid operator in your area, your supplier's contract terms, and real-time market prices at the time you use energy. Tariff components — particularly distribution network rates and federal levies — are updated annually and may have changed since this calculator was last refreshed. The 10s Smart savings shown are modelled on typical smart load-shifting behaviour and are not a guarantee of the saving you'll achieve. We'll give you a precise, personalised quote when you sign up.
Standard dynamic contracts
Predictable, but limited
With standard dynamic contracts, you receive a daily list of hourly prices—typically published around 15:00 for the following day. This gives you some ability to plan your energy usage. For example, running your heat pump later in the evening or scheduling your washing machine overnight.
But the reality is:
- Prices only update once per hour
- You miss the real peaks and dips within those hours
- You’re rarely using energy at the absolute lowest price
In other words, you’re playing it smarter—but not smartest.
10s dynamic contracts
10s gives you more!
Did you know there are moments—almost every day—when you can actually get paid to use electricity?
Yes, really. Instead of paying to charge your car, you get paid to do it. Sounds upside down, but it isn’t.
Electricity can’t be stored at scale in the grid. At the same time, we’re relying more on wind and solar—both unpredictable by nature. When supply suddenly exceeds demand, the market is left with a surplus of energy. And that surplus needs to go somewhere.
If you know how to take advantage of it, you can get paid to absorb that excess energy instead of paying for it.
Curious how often this happens? You can track it yourself here:Grid data Elia
If you have Home Assistant, you already have control over the biggest energy consumers in your home - your heat pump, air conditioning, EV charger, and more. The data is there. The control is there.
But saving money, in reality, is not easy.
Most energy providers push you toward a dynamic pricing contract, promising lower costs if you time your usage right. In reality, that means constantly chasing price fluctuations and hoping you hit the cheap windows.
10s Energy cuts through that. It turns price data into something you can actually use—so your smart home doesn’t just run efficiently, it runs cost-effectively without the guesswork.
Get paid for charging your car (yes, really!)
- When prices drop below -20 €/MWh, you’re no longer paying for electricity—you’re getting paid to use it.
- That means charging your car, running your appliances, or heating your home can actually earn you money.
You stay in control:
- Set your own price threshold and only consume when it makes financial sense. Your smart devices handle the rest through Home Assistant—automatically switching on at the lowest (or even negative) prices.
- No guesswork. No manual chasing. Just smarter energy, on your terms.
Quarter-hourly rates
- This graph shows how Elia’s quarter-hourly prices fluctuate throughout the day—including moments when prices go negative and you can actually earn money by consuming electricity.
- 10s Energy spots these peaks and dips for you, so you can act at exactly the right time—without constantly watching the market.
And the impact is real:
- On 21/05/2025, charging your car between 13:00 and 15:00 could have earned you nearly €20.
- That’s the difference between reacting to prices… and truly staying ahead of them.