The presented study examined the multigenerational power, cooling, heating, and hydrogen systems in coastal areas using thermodynamic and economic modeling and multiobjective optimization tools. The organic Rankine cycle (ORC), water heater, proton-exchange membrane (PEM) electrolyzer, absorption chiller, and photovoltaic (PV/T) panel were all included in a case study that was carried out in four different regions. In the EES, the suggested system was thermodynamically modeled. By utilizing the surface response (RSM) methodology, multi-objective optimization was carried out to identify the ideal PV/T area, turbine efficiency, evaporator pinch point, pump efficiency, and turbine input temperature. The ideal cost rate and exergy efficiency were 1.299 USD/h and 19.100%, respectively. The feasibility of the suggested module was studied in coastal areas of San Francisco (America), Dubai (Asia), Barcelona (Europe), and Melbourne (Oceania). Finally, the system's effectiveness in providing the power, cooling, and heating demands of a two-floor two-unit building during the year was evaluated. • Multigenerational system analysis: Modeled power, cooling, heating, and hydrogen systems in coastal areas. • Multi-objective optimization: Optimized parameters for system performance using surface response methodology. • Feasibility assessment: Evaluated system viability in San Francisco, Dubai, Barcelona, and Melbourne coastal areas. • Performance evaluation: Assessed system's ability to meet year-round power, cooling, and heating demands. [ABSTRACT FROM AUTHOR]