Under the goal of carbon peaking and carbon neutralization, the integrated energy system will accelerate the cleaner and low-carbon structure transition. In addition, high carbon dioxide emissions in some industrial parks give rise to a series of environmental problems. The emergence of power-to-gas technology provides new insight into solving the problem. This empirical research is an attempt for lower carbon emissions and greater application of renewable energy, and a proposal for an expansion planning model for integrated energy systems considering different sources of CO₂. With the introduction of economic conversion coefficients, carbon dioxide emission is converted into economic dimensions and the other cost together to form the objective function with the minimum cost. The constraints of energy balance, energy network, and equipment output are considered. Finally, through the simulation of the calculation example, the total cost of the carbon capture scenario is reduced by 9.9%, and the carbon emission 24.6% compared with the existing park, which verifies that the proposed model considering capturing carbon dioxide can effectively take into account the low carbon and economic efficiency, and meanwhile enhance the renewable energy accommodation.