GrønGas Vrå was built by E.ON Danmark and Jens Peter Lunden in 2015/16. The owners designed the plant themselves and used subcontractors to establish the plant. The biogas produced from the plant is upgraded to natural-gas quality (by removing CO2 from the biogas) and supplies all the biogas to the natural-gas network, as bio natural-gas.
The plant primarily processes livestock manure and other organic residues from agricultural production and the food industry.
GrønGas Hjørring was built in 2001 by Xergi in collaboration with Jens Peter Lunden. The plant has been continuously expanded, most recently in 2016 with two new Jenbacher engines. The gas is used to make electricity and heat, which is sold on the electricity grid, and the heat is sold to Hjørring district heating works.