Proposed method demonstrates that digitalization and optimization are powerful tools to explore the potential of CCU. We anticipate that availability of tools that can generate precise process estimates under a low computational cost can support decision-making in comparing numerous technologies. Specifically, the scope of this work is [gas + CCUS], which integrates the gas-fired power plants with CCU, as well as the heating utility partially substituted by CCS electricity. Eq 12 and random simulations can deliver a rough range of emission factor of [Gas + CCUS], see the red column in Figure . Single-objective optimization can reach the lower bound for the emission factor, while multi-objective optimization tends to slightly increase the emissions while improve other objectives, such as the economic aspect.