Your choices:
1 Process heat/steam (50 - 150 °C); 2 Electricity; 3 Biomass (digestible sludge)
| What is your resource? | What do you want to deliver? | What is the service the customer wants? |
| 3 Biomass (digestible sludge) | District cooling | Comfortable indoor climate |
| Biomass (fermentable sludge) | District heating | Electricity |
| Biomass (solid) | 2 Electricity | Process cooling (< 0 °C) |
| Geothermal | Fuel: Gaseous | 1 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) |
In case the CHP or tri-generation plant providing the district heating operates on contracted biogas, or if raw biogas is an extensive part of the fuel supply, then the net result will be that the electricity produced originates from digestible sludge.
It may be possible to contract electricity from such plants – and in that case the industrial process would actually be accounted for as operated on digestible sludge as the energy source.