The 64th International Conference of Scandinavian Simulation Society, SIMS2023, held at The Steam Hotel in Västerås, Sweden, during the period September 25–28, 2023 was open to scientific contributions from broad aspects of recent research and development work in modelling, simulation, and optimisation in engineering applications. This includes modelling and simulation for design, planning, optimisation, control, and monitoring as well as practical case studies of industrial automation. Furthermore, tools and toolboxes for modelling and simulation, numerical methods for simulation, novel modelling techniques, and visualization of modelling and simulation results are of interest. Typical applications include but are not limited to (i) Renewable energy systems (bioenergy and biofuels, geothermal, hydro, solar, thermal, wave, tidal, and wind energy), (ii) Hydrogen technologies (production, storage and transportation, hydrogen value chain), (iii) Energy systems (electric power, energy storage, fuel cells, heat pumps, industrial plants, energy use in buildings, power plants), (iv) Transportation (automotive, hybrid and electrical vehicles, marine, infrastructure), (v) Industrial processes (carbon capture and storage, chemical processing, oil and gas, and water treatment, (vi) Cyber-physical systems, and (vii) Biosystems and medical systems.

The scientific program of SIMS2023 was curated by an international program committee, consisting of researchers in simulation, artificial intelligence and machine learning, energy systems and industrial technology. The main goal was to deliver a high-quality program with a wide variety of topics. In the single-blind review process, at least three reviewers evaluated each submission and gave their recommendations. Ambiguous results were thoroughly discussed among the reviewers and the senior members of the program committee, who then made the final selection. SIMS2023 is the first conference on simulation of its kind in Europe starting as early as 1959, and to the best of our knowledge, it is the only conference on simulation that covers all aspects related to simulation in a diverse range of applications. The program committee welcomed submissions in the following formats:regular technical papers up to 8 pages (including references) on substantial, original, and unpublished research, including evaluation results, where appropriate, and poster submissions on focused contributions from students and industries and tutorials. In addition, we were very fortunate to have two high-profile keynote speakers: Dr. Alf Isaksson (ABB, Sweden), an expert on Automation and Industrial Autonomy; and Dr. Jianping Wang(Hitachi Energy Research, Sweden), a renowned expert on Power Systems protection.

The proceedings include only the regular technical papers that were papers accepted by the review committee and were presented during the conference. In more detail, the conference received 77 submissions from all over the world, including from China, Germany, Finland, Norway, France, Germany, and Italy. We were able to accept 52 full papers, 8 posters and 2 tutorials. 51 accepted and presented papers are collected in this volume. Organizing a conference and a peer-review process always relies on the goodwill and support of many colleagues who take their valuable time and contribute to an interesting and fruitful program.