06 Mar. 2018 [PDF STEP Sustainable Energy Solutions (5.65 MB) ](/sites/g/files/dvc3531/files/document/2018/12/STEP_esite2018_fi.pdf) ![](/sites/g/files/dvc3531/files/styles/crop_freeform/public/image/2018/11/esitekuvake_oranssi_suomi_0.jpg.webp?h=d72ff27f&itok=aOeKYY0m "STEP Sustainable Energy Solutions")