CHP gas motor with generator.


an output of 1 MW electricity and 1.4 MW thermal energy. The electricity this generates is sold back to the grid, and the heat is used on the collecti- ve’s own sites. Bercvenne receives the heat left over after the bio-fermenter has satisfied its own, and the pig farm’s, heat requirement. This residual heat is used to heat the farm (gas is only bought for cook out). Using this residual heat, Bercvenne can save 44 % on buying gas from outside sources.


The costs for heating and cook out when residual heat from the bio-fermenter is used are just 56 % of the costs with reliance on natural gas. In other words, 44% is saved on costs for heating and cook out. This means that the renewable energy supplied by the bio-fermenter accounts for 44% of the thermal energy requirement. As the residual heat from the bio-fermenter is linked to the heating (natural gas is used for cook out), practically the entire heating require- ment can be satisfied using this renewable, residual heat source.


Monitoring results


Kemmeren-de Kok Rijsbergen Kemmeren-de Kok comprises seven growing rooms of 328 m2 growing surface area. The


Kemmeren wood burner Natural gas


Annual consumption gas Calorifi c value gas


Annual calorifi c requirement Gas price


Annual costs (excl. VAT) Wood (forest wood mix)


Annual consumption forest wood mix Calorifi c value forest wood mix Annual calorifi c requirement Wood price


Annual costs (excl. VAT) Annual saving (excl. VAT)


mushrooms are harvested manually and grown in a six-week cycle. The rooms have individual climate units. In 2011 the farm made a complete transition to combusting wood chips to gene- rate power for heating and steam. No more gas is used. The wood burner was developed to supply warm water and steam. It is important to burn clean wood (no nails or suchlike) with sufficient calorific value to generate the energy needed to produce steam. A mixture is used of wood chips sourced from forests, supplemented by a small fraction of finely chipped pallets. The boiler has a thermal output of 500 kW. With COM subsidy, the ROI was three years. This would have been even shorter if a subsidy such as the Stimulation of Sustainable Energy (SSE) had been applied for/granted.


The costs for heating and cook out when wood combustion is used are just 40 % of the costs with reliance on natural gas. In other words, 60% is saved on costs for heating and cook out. In addition to the wood burner that generates all the necessary thermal energy sustainably, electrical energy generated using sustainable sources is also purchased, so the farm produces with a completely CO2-neutral footprint.


Monitoring results ‘t Voske BV Uden


’t Voske comprises 13 growing rooms of 250 m2 growing surface area. The mushrooms are harvested manually and grown in a six-week cycle. The climate units in the rooms are connected to a central duct, which has ground pipes and a geothermal system to climatise the air introduced into the rooms. The farm only grows chestnut mushrooms and portobellos. The filling weight at > 100 kg compost per m2 growing surface area is therefore higher than with white mushrooms. The Energy


 fossil fuel


71.942 m3/year 31,65 MJ/m3


2.276.964 MJ/year € 0,35 per m3 € 25.180 yearly


renewable energy


167,5 ton/year 13.594 MJ/ton


2.276.964 MJ/year € 60 per ton


€ 10.050 yearly € 15.130 -60%


PV solar panel array on the roof of the farm.


MUSHROOM BUSINESS 33


Wood boiler with warm water buff er tank.


Since the fi rst multi-year energy plan was agreed in 1998, the Dutch mushroom sector has devoted attention to and supported growers in fa- cilitating energy savings and utilising renewable energy. The application of these in practice has continued to develop and progress, made possible and funded by members of the Dutch Steering Committee for Clean & Effi cient Mushroom Gro- wing. This committee unites LTO Mushroom Group, the Product Board for Horticulture, the Mi- nistry of Economic Af- fairs, the Netherlands Enterprise Agency and Dutch growers.


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