“…In this special issue, Viesi and coauthors [13] apply a multi-objective optimization framework based on the EnergyPLAN [14,15] simulation model to an energy community in the Alps, investigating trajectories towards a decarbonised energy system in 2030 and 2050. The work thus places itself in a school of work that transcens the typical gap between simulation models like EnergyPLAN and optimisation models with endogenous system composition optimisation [16,17], as also examplied by Mahbub [18][19][20][21][22], Prina [23][24][25][26][27][28][29], Fischer [30], Bellocchi [31], Komušanac [32], Groppi [33,34], Johannsen [17], Laha [35], Vaccaro [36], Herc [37], and Maigret [38].…”