1. Energy crops 1a. Animal manure 2. Preliminary pit 3. Chopper 4. Primary digester 4a. Mixer 4b. Heating units 4c. Pipes (gas and liquid) 5. Secondary digester 5a. Gas holder 6. Gas generator 7. Fermented residues 7a. Separator 7b. Transportable dry fermented residue (fertilizers) 7c. Water reservoir 7d. Water for irrigation 8. Heat exchangers 9. Heating system 10. Electricity supply 11. Heat supply for heating elements