Billund Vand og Energi A/S, Denmark, is a public utility company providing services in water supply and waste management to the municipality of Billund.
The Grindsted Renseanlæg established in 1997 is a wastewater treatment plant combined with a co-digestion facility where industrial and municipal bio-waste from the municipality is digested together with waste-water sludge. The plant was upgraded in 2016 into Billund Biorefinery with new technologies in order to increase biogas production, minimize energy consumption, enhance process control and improve effluent quality. The vision of the project was to combine strong environmental technologies in water purification and biogas in one significant full-scale demonstration project.