The micro-CHP engine used in the farm for power and heat production is a Finnish Sisu Diesel-based, factory-converted Otto cycle fuel oil engine that was optimized for raw biogas at the farm. Such Diesel engines are most commonly used in Valtra tractors. It has 30 kWe electric power capacity and additional 60 kWt heat production capacity. In addition, a separate 80 kWt gas boiler is in use. The raw biogas where hydrogen sulphide and water has been removed can be used directly in the CHP unit and the gas boiler. Carbon dioxide removal is not needed. Electricity is used in the farm and especially during winter also sold to the grid. About 40 MWhe is produced annually. In wintertime, the production level is optimised by storing food industry waste for peak domestic needs and peak grid power price. In summertime, electricity prices are too low to allow profitable sales but selling to the grid replaces flaming when production exceeds consumption. About 250 MWht of heat is produced annually by the CHP unit and the gas boiler. It is used for hot water heating, space heating and crop drying (Figure 3).