Abstract: To optimize the cogeneration integrated energy system (IES) with clean energy as the primary focus, an optimal scheduling model considering the synergistic effect of hydrogen enriched compressed natural gas (HCNG) and concentrating solar power (CSP) is proposed. This model aims to address the mismatch between supply and demand of thermoelectricity in the system, as well as the low economic benefits of green power hydrogen production. Firstly, the low-carbon transformation of the traditional cogeneration system is implemented, and the combined heat and power (CHP) unit is combined with the gas-mixed hydrogen technology to construct the mathematical model of the gas-mixed hydrogen cogeneration unit. Secondly, a CSP plant with a large-capacity thermal storage system is introduced. On this basis, by integrating a waste heat recovery device with an electric heater, a CSP model considering heat recovery is constructed to realize CSP-CHP-HCNG coordinated operation. Finally, an IES optimal scheduling model for CSP-CHP-HCNG collaborative energy supply is established, with the objective of minimizing the total operational cost of the system. By comparing four different scenarios and analyzing the output performance of each equipment under varying gas hydrogen blending ratios, it is proved that the model significantly promotes the consumption of new energy and improves the economic benefits of system operation.