Bio natural gas is biogas upgraded to natural gas quality and consequently, it can be sold to consumers via the natural gas grid.
In 2011, DONG Energy commissioned Denmark's first upgrading plant at the purifying plant in Fredericia, Fredericia Centralrenseanlæg. In 2014, the next plant was commissioned at Horsens Biogas and at the beginning of 2016, production from DONG Energy's future upgrading facilities at Linkogas a.m. b.a. will begin.
DONG Energy is also the only energy company in Denmark delivering both certified wind power from Danish offshore wind farms as certified bio natural gas from the Danish biogas plants.
In December 2014, ENVO Biogas Aabenraa received an approved EIS from Aabenraa Municipality. This means that a close cooperation with Aabenraa Municipality and the contractor submitting the construction application has been initiated. At the same time, the negotiations related to the sale of the produced bio natural gas amounting to approximately 68 million cubic metres will begin.
The total production of ENVO Biogas Tønder and ENVO Biogas Aabenraa will constitute more than 60% of the annual Danish biogas production. Each plant produces approximately 1.3PJ and the annual production of both plants will total 2.6PJ. By comparison, today, all installed biogas plants in Denmark produce 4.3PJ altogether.