Type of CHP system: Anaerobic digestion

Plant owner:

NEGH Bio-Strom is owned as limited partnership by 4 farmers.

Commissioned: (reconstructed):2002 (2003)

Status of plant: Commercial

Contractor details:

CHP: MDE 2×150 kW, Generator: Stanford 52 kVa; fermenter: concrete fermenter own construction (2×1000 m3), SO2 removal by means of an air compressor.

Power generation: Gas engine

Plant enlargment from 2 x 150 kW (300 kW) to 2 x 250 kW (total 500 kW) in October 2003

Main fuel:


5000 m3 animal maure, 1200 m3 grass, 2000 m3 maize silage; 1800 t grains of maize

Nominal capacities & efficiencies:

Gross electrical output: 0,3 MWe

Heat output: 0,68 MJ/s

Power to heat ratio: 0,44

How is plant controlled:

Continuous operation for 24 hours according to gas yield

Heat usage: Heating only

Energy usage:

The annual electricity production amounts to 2,000 MWh (2002), of which  100% is fed into the public grid.  Heat production amounts to 4,500 MWh , of which 1350 MWh are use for the farm and the farm house, the remaining amount of 3,150 MWh is fed into the own district heating network of 8 km.

Fuel storage:

The fuel storage has a size of 2000 m3 for silage and 1800 t of corn maize.

Plant description:

System: continuous fermenter
Authorisation: ElWOG 2000

Digester capacity: 2000

Residence time: 100

Process temperature: mesophilic process, temperature: 38 °C

Annual gas production: 1700000

Gas quality: 55 % methan, heating value: 5,5 kWh/m3

Wet fermentation, dry matter 10% , two-level process

Electricity sale info:

The feed in rate in Austria is regulated by law and depends on the type of biomass used and on the size of the plant.

Data collected and quality assured by: Austrian Energy Agency.

Contact person: Elvira Lutter