E4SMA provides services in the areas of energy planning, policy and environment. We provide support in the creation of matematical models and tools able to represent the complexity of existing energy systems and to investigate how such systems may evolve over the years, using scenario-based approaches. E4SMA develops and runs integrated energy systems models, or "ad-hoc" tools and methodologies, for medium-long term analysis in order to help energy decision makers to evaluate a range of challenges at different geographic scales. E4SMA has a wide experience in MARKAL/TIMES techno-economic modelling, with an international track record in local, regional, national, multiregional and global applications. It is actively involved in IEA-ETSAP community providing support and training; and also handles various system analysis approaches, such open source optimization tools (e.g. OSeMOSYS), accounting frameworks (e.g. LEAP), multi-criteria platforms (e.g. PROMETHEE), or power systems specific models (e.g. PLEXOS).