Hear Christan Carlsson tell more in the clip.
The big white tanker comes with the biogas that is converted to liquid form and really cold - minus 160 degrees.
For one hour, it must be pumped over to the plant with the cooling towers, which eventually convert the liquid to gas again.
From there, it can be incinerated at the factory and dried, for example, newly produced toilet paper.
The goal is to reduce fossil emissions.
Until 2030, the company will reduce greenhouse gas emissions by 25 percent for its energy and electricity use within the company and for purchased electricity compared to the base year 2016.
- This is an important step in our ambition to become completely fossil-free, says Christian Carlsson, site manager at Lilla Edet mill.