Techno-economic analysis of a biogas-fueled micro gas turbine cogeneration system with seasonal thermal energy storage

•An integrated energy system for meeting electricity and heating demand in a small hotel was investigated.•The models of the core components, including micro gas turbine, seasonal thermal energy storage, and heat pump were developed and validated.•Modelica/Dymola modeling framework was employed to assess techno-economic performance over system's lifetime.•Taguchi method and ANOVA analysis were adopt to reveal significant influence of borehole design factors on energy consumption and NPV.