To accurately assess the overall performance of integrated energy systems

with a focus on their key characteristics of low carbon emissions and high efficiency

and to facilitate the safe integration of renewable energy

this study proposes a weighted energy utilization efficiency index. The integrated energy system in industrial parks is identified as a typical scenario for the application of comprehensive energy. Considering the relatively low energy conversion efficiency of renewable sources in these systems

the study evaluates the performance of the renewable and fossil fuel energy systems using energy efficiency ratios and primary energy utilization rates. Moreover

the proportion of supplied energy is utilized as a weighting factor to indicate the system's relative significance within the total energy framework

leading to the calculation of the weighted energy utilization efficiency for the park's integrated energy system. Through comparative analysis with conventional metrics such as primary energy utilization rate and exergy efficiency

the results indicate that the proposed index can effectively reflect the level of renewable energy integration

showcasing the system's core features of low carbon and high efficiency. This is crucial for directing strategies towards energy saving and consumption reduction.