Your choices:
1 Fuel: gaseous; 2 Biomass (digestible sludge); 3 Electricity
| What is your resource? | What do you want to deliver? | What is the service the customer wants? |
| 2 Biomass (digestible sludge) | District cooling | Comfortable indoor climate |
| Biomass (fermentable sludge) | District heating | 3 Electricity |
| Biomass (solid) | Electricity | Process cooling (< 0 °C) |
| Geothermal | 1 Fuel: Gaseous | Process heat/steam (50 - 150 °C) |
| Sunshine | Fuel: Liquid | Process heat (150 - 1000 °C) |
| Water | Fuel: Solid | Process heat (> 1000 °C) |
| Wind | Local cooling (ind. house) | Transport |
| Residual oils/fats etc | Local heating (ind. house) |
Depending on the scale of the digestion plant may customer demands for electricity be met locally or remote:
- With a farm-scale digester and an IC-engine will at least parts of the electricity demand at the farm be met by individual electricity production.
- With industrial-size digesters primarily aimed to handle internal residues such as offal, fish rinsing's or alike at food processing industrial sites may the needs for process heat first be covered but also at the very least parts of the needs for electricity. In this scale, the co-generation may take place either by aid of a steam-turbine or by a gas-fired engine.
- With city-sized digesters aimed at producing an upgraded gas fuel may the gas either be used locally in the municipal CHP or tri-generation plant or it may be injected to the gas grid and hence used for electricity production in any power station.