Within the framework of the REEEM project, this report constitutes deliverable D5.4 Ecosystem Services case study report. This case study of Lithuania was led by the Environmental Management and Assessment (EMA) research group, KTH Royal Institute of Technology, in cooperation with contributors from several institutions, listed below. The case study was included in REEEM Work Package 5 on Environment, Health and Resources, where multiple sustainability goals are addressed for gaining a comprehensive understanding of the systemwide implications of decarbonisation pathways. The case study of Lithuania intended to assess impacts on multiple ecosystem services of forest bioenergy options, as well as to take the first steps for model linking between an ecosystem service assessment tool, and an energy sector development model. In this way, the links between energy assessment and ecosystem services could be strengthened in a more integrated assessment, targeting to increase the sustainability of forest bioenergy strategies.