SkyClean Scale-up


Agriculture, shipping, aircraft, trucks and certain industrial processes are difficult sectors to decarbonise. For example, a significant proportion of agricultural CO2 emissions come from fiber in livestock manure that is spread in the fields and from plant residues that, when plowed and decompose, emit large amounts of CO2.


Project SkyClean builds a pyrolysis plant that heats biological residues in an oxygen-free room and converts the residues into biochar, bio-oil and syngas. The biochar can be plowed down and store CO2 stably for over 500 years. Biochar also has a favorable soil improvement effect and can help reduce agricultural methane emissions. The bio-oil can be refined and used as fuel for e.g. ships, aircraft and trucks. Syngas can be used for industrial heating, district heating or potentially converted to bio-methane.


DTU estimates that recycling of manure and biological residues through the pyrolysis process can reduce agricultural CO2 emissions by 50 percent. The company Stiesdal estimates that SkyClean technology has the potential to limit Denmark’s emissions by DKK 7 million. tons of CO2 in 2030.


Problem owner

Agri Energy

Problem solvers

Stiesdal SkyClean

KK Wind Solutions

Aktive Energi Anlæg A/S


Vestjyllands Andel

SEGES Innovation

DTU Chemical and Biochemical Engineering 

DTU Construct

Roskilde University

Københavns Universitet – Plant and Environment 

Department of Environmental Science, Aarhus University

Department of Agroecology – Aarhus University

Department of Ecoscience

Food & Bio Cluster Denmark

Project video

Project timeline

PHASE 1: Conceptualisation
PHASE 2: Development and testing
PHASE 3: Demonstration and validation
PHASE 4: Commercialisation

Financed by


Start: August 2022

Slut: December 2025

Totalbudget: 200.582.061,00 kr.

Contact person

Christian Munk Jensen

Christian Munk Jensen
Project Manager
Tlf: +45 5055 2606