Foreword Purpose of this case studies collection, is to present some training offeres provided to workers in geothermal and solar installations. Partners select experts in geothermal and solar organizations/ enterprises/ training centers for the implementation of the case studies. WP leader AOCDTF collected all Good Practices from partners DEBEGESA and ECTE; and oversaw overall editing of case studies for consistency and transparency. Project promoter CCIC, proceed with this publication of the Successful book stories.