Integrated energy system (IES) is an important means to achieve the comprehensive utilization of heterogeneous energy and improve the efficiency of energy utilization. But its coupling relationship is complex, and the running model often has nonlinear characteristics, making it easy to fall into local optima when solving using traditional algorithms. This article proposes an IES optimization running method based on the bald eagle search algorithm (BES) to address this issue. Firstly, an IES structure considering electrical-thermal-gas coupling was constructed. Secondly, an IES optimal operatio...