Type of CHP system: Extraction from landfill

Plant owner:

The LFG plant is owned by:

ESCO International ApS

Sødalsparken 20

DK-8220 Brabrand


Phone: +45 8734 3466

Fax: +45 8734 3469

The LFG plant is operated by:

DDH Contractors (Hedeselskabet)

Klostermarken 12

DK-8800 Viborg


Phone: +45 8728 1000

Fax: +45 8728 1001


Commissioned: 1997

Status of plant: Commercial

Main contractor:

DDH Contractors (Hedeselskabet)

Klostermarken 12

DK-8800 Viborg



Power generation: Gas engine

Main fuel: Landfill gas

It is expected that the gas from the site can be utilised during more than 20 years. The annual production is approximately 7,400,000 m3 gas, 11,000 MWh electricity and 14,000 MWh heat (2003).

The gas production from the site is decreasing and only about 1,000 MWh per month (ie. app. 50% of the nominal capacity) can be produced. It is considered to utilise the remaining capacity by running the engines on natural gas.

Nominal capacities & efficiencies:

Thermal input, biomass & waste: 7,54 MW

Total thermal input, incl. fossil fuels: 7,54 MW

Gross electrical output: 2,94 MWe

Net electrical output: 2,94 MWe

Heat output: 4 MJ/s

Electrical efficiency, gross: 39 %

Electrical efficiency, net: 38,99 %

Overall efficiency, gross: 89,2 %

How is plant controlled: Currently the plant is run due to the amount of fuel available.

Heat backup: No such installations

Heat usage: Heating only

Energy usage:

The generated electricity is delivered to a local distribution company, Odense Energi Net A/S, via two transformers. The heat is sold to Odense Municipal District Heating Supply.

DH inlet temperature: 85-90 °C

Waste water: No waste water

Plant description:

Stige Ø landfill site has been diked from Odense Fjord and is the largest landfill site in Denmark. Six million tonnes of waste has been deposited at the site covering an area of more than 54 ha reaching a height of more than 30 metres at some places.

In order to recover the landfill gas 160 holes have been drilled vertically into the site. More than 25 km of tubing is used for drawing in the gas and connecting the 160 gas wells with four pumping modules, which are able to pump 720 m3 of landfill gas per hour (each). The pumping modules compress the gas to 1 bar above atmospheric.

The compressed gas is transported over 4 km to the CHP plant in Odense, where it is fed into four IC gas engines each with a capacity of 736 kWe and 1,000 kWth.

In 1998 the plant was expaned with a 5th pumping module, placed at a new landfill site adjencent to Stige Ø. The pumping module is connected to 17 gas wells. The capacity of the pumping module is 250 m3/h of landfill gas. The landfill gas is pumped into the existing transmission line to the CHP plant in Odense.

Annual gas production: Year 2003: 7.415.000 Nm3 Nm3

Gas quality: CH4: 45 %, CO2: 37 %, N2: 17 %, O2: 1 %

Engine: Jenbacher: JMS 316 GS – L  (4 pcs.)

Flue gas cleaning: No cleaning system

Staff: At the CHP plant a control system enables the operational staff to control and monitor the plant operation from a remote position. The plant itself is unmanned.

Electricity sale info: The electricity tarifs is time dependent

Peak load: 8 am -12 am, 5 pm- 7 pm

High load: 6 am-8 am, 12 am-5 pm, 7pm- 9 pm

Low load: 9 pm – 6 am

Data collected and quality assured by: FORCE Technology.

Contact person: Anders Evald