The solar cell park will deliver about 2 megawatt hours per year and cover about two hectares (20,000 square meters) of the old landfill of 30 hectares.

Here, the people of Eskilstuna have previously thrown away their unsorted rubbish. 

- This is a giant mountain.

One of the challenges is that it is quite windy here so we have to have a good foundation for the panels.

We have not investigated wind power yet and it is mainly that the ground is very soft so we can not have heavy structures here, says Tony Roos.