I. Introduction
Extreme weather events, characterized by their high impact and low probability, can disrupt system components and cause severe damage. The increasing interdependencies between different energy sectors (e.g., power, gas, and heat) further exacerbate the consequences of extreme events. To tackle these challenges, the concept of resilience has been adopted in the field of integrated energy systems (IESs) [1]. In light of the potentially serious disruptions, the primary objective of a resilient IES after extreme events is to maintain the uninterrupted supply of essential loads across different energy sectors, thereby rendering a system-wise IES load restoration problem [2].