The 37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems – ECOS 2024 – will be held, from 30 June to 5 July 2024, on the island of Rhodes, the place where one of the Seven Wonders of the Ancient World: the “Colossus of Rhodes” once stood, a statue honouring the Greek Sun-God “Ήλιος”, “Helios”: the giver of life and source of energy.