DONG Energy has decided to phase out the use of coal in the next six years.
Its coal-fired power stations will stop using the fuel source by 2023 and will be replaced with biomass instead.
Last year, both Studstrup and Avedøre power stations in Denmark were converted to run 100% on wood pellets and straw.
This spring, Skærbæk Power Station near Fredericia will also be able to run solely on wood chips.
DONG Energy said it has reduced coal usage by 73% since 2006.
CEO Henrik Poulsen said: “We’ve decided to take the final step and phase out the use of coal at all our power stations. The future belongs to renewable energy sources and therefore we’re now converting the last of our coal-fired power stations to sustainable biomass.
“The decision is in line with our vision to lead the way in the transformation to a sustainable energy system and create a leading green energy company.”
The news follows DONG Energy’s announcement last November to quit the oil and gas industry and focus on renewables.