Laatste update: 02/11/2026
All calculation rules in one place, so you can check if a figure is correct instead of having to take it on faith.
Normalization: pppn and pkpn
Your consumption is divided by your occupancy.
- pppn = per person per night. Your annual consumption divided by your person-nights.
- pkpn = per room per night. Your annual consumption divided by your room-nights.
Person-nights are the fairest way to compare accommodations with each other. Room-nights say more about how efficiently your building operates, regardless of how many people slept in a room.
Why annual figures and not average monthly figures
The annual pppn is always calculated from the annual totals: annual consumption divided by annual occupancy. Never as an average of twelve monthly values.
That difference isn’t just theoretical. Statbel counts a stay in the month the guest departs, so the occupancy per month shifts slightly. This levels out at the annual level, but not at the monthly level. An average of monthly values would introduce that distortion into your annual figure. More on that under consumption per month.
Correction for private space
If you live in the building yourself, your household does not belong to your accommodation. In your accommodation details, you specify a percentage of private use, estimated by surface area, and that portion is removed from your consumption.
It’s an approximation. A family living in 30% of the building all year round doesn’t necessarily consume 30% of the energy. But without a correction, an owner who lives on-site would structurally look worse than one who doesn’t, and that would be a greater distortion.
Two ways to count renewables
In the app, you’ll see two renewable percentages side by side, and they differ from each other intentionally.
HCMI is the international method for comparing accommodations. It counts everything that is renewably generated, including green electricity you purchase with a guarantee of origin.
EPC/NR is the Flemish method for the energy performance certificate of non-residential buildings. It is stricter: only energy produced on-site or demonstrably renewable counts. Green electricity from the grid does not count here, because the grid delivers the same electricity to everyone; a certificate doesn’t change the building.
The formula is the same in both cases: the sum of your renewable kWh divided by the sum of all your kWh. Only the answer to the question “does this count as renewable?” is different.
| Energietype | Telt als hernieuwbaar (HCMI) | Telt als hernieuwbaar (EPC/NR) | Meegerekend in EPC/NR |
|---|---|---|---|
| Biomassa met warmtemeting | ja | ja | ja |
| Eigen windenergie | ja | ja | ja |
| Eigen zonne-energie | ja | ja | ja |
| Elektriciteit injectie op net | ja | ja | ja |
| Warmtepomp | ja | ja | ja |
| Zonneboiler | ja | ja | ja |
| Biomassa (hout/pellet) | ja | nee | nee |
| Elektriciteit (Groen met GVO) | ja | nee | ja |
| Waterstof (groen) | ja | nee | ja |
| Elektriciteit (Grijs) | nee | nee | ja |
| Gas | nee | nee | ja |
| Kolen | nee | nee | niet meetbaar |
| LPG | nee | nee | ja |
| Stookolie | nee | nee | ja |
| Waterstof (Grijs) | nee | nee | ja |
"Meegerekend in EPC/NR" is een andere vraag dan "telt als hernieuwbaar". Warmte uit biomassa telt alleen mee als ze met een warmtemeter gemeten is, dus brandstof op gewicht blijft buiten die berekening. Staat er bij een van je bronnen "niet meetbaar", dan geeft het platform geen EPC/NR-percentage. Deze tabel komt rechtstreeks uit de databank van het platform.
For wood and pellets, it depends on what you measure. If you enter your fuel under Biomass (wood/pellet), that heat does not count for EPC/NR: without a heat meter, that method does not assign any renewable heat to it. If you have a heat meter on your boiler and choose Biomass with heat measurement, the measured heat does count. For HCMI and for your CO₂, biomass counts in both cases.
Why the EPC/NR figure is sometimes missing
EPC/NR may show a dash where HCMI does give a number. This happens in two cases:
- You are using an energy type that doesn’t fit the EPC/NR calculation. In the measurement table, you can recognize this by the EPC X badge; currently, this applies to coal.
- You have marked a fossil source as not measured. In that case, the share is unknown, and calculating a percentage would act as if it were zero.
So a dash doesn’t mean you’re scoring poorly, but that the figure cannot be calculated fairly.
There is one case where both show a dash: if you feed more electricity back into the grid over the year than your total energy consumption. Then there is nothing to divide, and any percentage would be meaningless.
Enter your feed-in, otherwise your percentage won’t be correct. The electricity you inject into the grid is subtracted from your consumption. If you enter your solar production but not your injection, that full yield remains as self-consumption. Your total then becomes too high AND the renewable part becomes too high, so your renewable percentage is artificially inflated. You can find your injection figure on Mijn Fluvius or on your bill.
The role of the SCOP with a heat pump
A heat pump extracts more heat from the environment than it consumes in electricity. That surplus counts as renewable, and the ratio follows from the SCOP: with a SCOP of 4, three-quarters of the heat comes from the environment and one-quarter from electricity. That’s why that field is mandatory when you enter a heat pump.
CO₂: scope 1, 2, 3 and 4
Scope 1 is direct emissions: fuel that you burn. Gas, heating oil, propane, pellets. An emission factor per unit applies to each fuel.
Scope 2 is indirect emissions: the emissions created elsewhere to produce your electricity or heat. For regular electricity, the platform calculates using the factor of the Belgian production mix, which varies per year. For electricity with a guarantee of origin, that factor is much lower.
Scope 3 is everything created by your activity but falling outside your own management: what you buy, outsourced transport, and your guests’ travel. That travel and those purchases are not in your footprint, and in tourism, they are often much larger than scope 1 and 2 combined. One part of scope 3 does count: the upstream chain of your energy.
A nuance regarding “scope 1 and 2”
Two questions often get mixed up here. The first is whose emissions they are: scope 1 is what burns at your site, scope 2 is the energy you buy, scope 3 is the rest of your chain. The second is which part of the life cycle of a fuel you count: only what is released during combustion, or also the extraction, refining, and transport to you.
We count that second part. Formally, that upstream chain belongs to scope 3, so our figure is strictly speaking “scope 1 and 2 plus the energy-related part of scope 3”. We do this because it’s the fairest representation of your energy footprint: otherwise, an accommodation would look better by switching to a fuel with a dirty upstream chain.
Practical consequence: if a label or auditor asks for a pure scope 1+2 figure according to the GHG Protocol, our number will be higher than what they expect. That can be explained, but don’t say it’s the same thing.
And scope 4: what you set in motion for your guest
Scope 4 is about the emissions you avoid or cause in others through your choices. It doesn’t appear in any official accounting, and for an accommodation, it’s often the biggest lever there is.
An example from our own article: a certified holiday home that mainly targets intercontinental guests can score excellently on scope 1 and 2 and yet have a much larger real impact than a non-certified B&B that focuses on slow travelers from the local area.
How you use that lever is about what you offer and recommend: shared electric mobility instead of a classic motorcycle ride, a train connection prominently on your website, longer stays instead of short ones, local makers instead of souvenirs from afar, and activities in the neighborhood instead of day trips by car.
The platform doesn’t measure this, as it cannot be calculated reliably. It is, however, the reason why you shouldn’t see your footprint as the end point. See Scope 4 in tourism: hidden impact.
Which emission factors we use
All factors come from co2emissiefactoren.be, the Belgian reference list. Below are the values currently in effect, in kilograms of CO₂ per kWh.
| Energietype | Je voert in | kg CO₂e per kWh | Wat is meegeteld | Geldig | Opmerking |
|---|---|---|---|---|---|
| Biomassa (hout/pellet) | kg | 0,0498 | volledige keten | alle jaren | telt niet mee in de EPC/NR-berekening |
| Biomassa met warmtemeting | kWh | 0,0586 | volledige keten | alle jaren | |
| Eigen windenergie | kWh | 0 | afspraak | alle jaren | eigen opwekking, geen uitstoot toegerekend |
| Eigen zonne-energie | kWh | 0 | afspraak | alle jaren | eigen opwekking, geen uitstoot toegerekend |
| Elektriciteit (Grijs) | kWh | 0,249 | volledige keten | vanaf 2025 | |
| Elektriciteit (Groen met GVO) | kWh | 0,011 | volledige keten | vanaf 2025 | |
| Elektriciteit injectie op net | kWh | 0 | afspraak | alle jaren | wordt van je verbruik afgetrokken |
| Gas | kWh | 0,2142 | volledige keten | alle jaren | |
| Kolen | kg | 0,32661 | enkel verbranding | alle jaren | maakt de EPC/NR-berekening onmeetbaar |
| LPG | L of kg | 0,2663 | volledige keten | alle jaren | |
| Stookolie | L of kg | 0,3452 | volledige keten | alle jaren | |
| Warmtepomp | kWh | 0 | afspraak | alle jaren | de gebruikte stroom telt via elektriciteit |
| Waterstof (Grijs) | m³ of kg | 0,405 | onbekend | alle jaren | |
| Waterstof (groen) | m³ of kg | 0 | afspraak | alle jaren | |
| Zonneboiler | kWh | 0 | afspraak | alle jaren | eigen opwekking, geen uitstoot toegerekend |
Factorset 2026.1, vastgelegd op 28/9/2026. Bron: co2emissiefactoren.be, CSV-export 15/06/2026 (EF totaal incl. voorketen). "Volledige keten" betekent dat de winning, de raffinage en het transport van de brandstof meegeteld zijn, niet alleen wat er bij jou verbrandt. "Onbekend" betekent dat de bron voor dat type geen totaalfactor geeft. Deze tabel komt rechtstreeks uit de databank van het platform en toont dus waar vandaag mee gerekend wordt. De factoren van een al gepubliceerd rapport liggen vast op het moment van publicatie en wijzigen niet mee.
The factor for electricity from the grid follows the Belgian production mix and therefore changes annually. The platform automatically uses the factor for the year you enter.
| Jaar | Elektriciteit (Grijs) (kg CO₂e per kWh) |
|---|---|
| 2018 | 0,216 |
| 2019 | 0,262 |
| 2020 | 0,222 |
| 2021 | 0,244 |
| 2022 | 0,197 |
| 2023 | 0,213 |
| 2024 | 0,212 |
| vanaf 2025 | 0,249 |
This table comes directly from the platform’s database, so it is never outdated. If a factor changes, the table changes with it.
