Returkraft would like to enter into a contract with a tenderer for engineering design services, delivery, installation, testing, commissioning and documentation of a complete battery based energy storage system on Returkraft ́s facility. The assignment is further described in point 2 of Appendix A - Requirement Specifications. The agreement shall have a duration of one (1) year, with an option for additional three (1+1+1) years, if Returkraft so wishes. Welcome to the competition!