TY - EJOU AU - Mykytenko, Viktoriia AU - Khudolei, Veronika AU - Hurin, Oleksandr AU - Kryshtal, Halyna AU - Mishchenko, Svetlana AU - Iskiv, Roman TI - Operational Constraints and Energy System Resilience under Low-Carbon Transition T2 - Energy Engineering PY - VL - IS - SN - 1546-0118 AB - This study develops a conceptual and analytical approach to assessing energy system (ES) resilience under conditions of a low-carbon transition, with particular attention to the role of operational constraints and adaptive capacity. The study demonstrates that, under conditions of polycrisis transformation, ES resilience cannot be adequately evaluated solely through technical and technological indicators, but requires the integration of functional, institutional, and operational parameters. An integrated resilience model is proposed in which operational constraints are interpreted as an endogenous structural factor that determines the boundary conditions of system functioning and shapes ES development trajectories. The methodological framework combines structural and functional analysis, the logical design method, indicator-based assessment, and scenario modeling. The results indicate that increasing functional capacity alone does not ensure a resilient state of the ES unless accompanied by a reduction in operational constraints and strengthening of adaptive capacity. Scenario-based calculations show that a 20%–30% reduction in operational constraints increases the composite resilience index by 0.12–0.18 points, corresponding to a transition from a medium to a high level of resilience. The proposed approach provides an analytical basis for resilience-oriented energy policy, strategic planning, and managerial decision-making under conditions of uncertainty and low-carbon transformation. KW - Energy system resilience; low-carbon transition; operational constraints; adaptive capacity; resilience assessment; scenario modeling DO - 10.32604/ee.2026.084053