The study focuses on the techno-economic optimization of energy systems in two Norwegian ports to enhance decarbonization efforts and create additional value. The analysis considers a large cargo port emphasizing increased electrification and an offshore supply base concentrating on renewable fuel production and surplus heat utilization. PV panels and battery storage are evaluated for both ports, with profitability heavily influenced by future electricity spot prices. Investments in PV panels range from 3.2 MWp for the cargo port to 6.6 MWp for the supply base. Optimal battery sizes, up to 1.8 MWh for the cargo port and 4.8 MWh for the supply base, are determined by demand variability and capacity tariffs. The study suggests that if flexible fuel production is integrated into port operations, the attractiveness of battery investments diminishes, with hydrogen production emerging as an alternative for demand-side flexibility. Furthermore, leveraging surplus heat from large-scale fuel production by exporting it to a nearby town can enhance the port's profitability. It is noted that the price of surplus heat should be below a certain range, depending on electricity prices, to ensure economic viability. The findings advocate for the strategic integration of various energy sources and technologies in port operations to drive decarbonization, increase flexibility, and maximize profitability.