In the global transition to a low-carbon economy, structural contradictions within electric power systems have become a core obstacle to achieving climate goals. Using Russia, Germany, and China as case studies, this article employs a comparative case study approach to analyze the inherent conflicts in resource-dependent, policy-driven, and scale-economic transformation models. Moving beyond descriptive analysis, the study identifies a central trilemma of "security, equity, and sustainability" that underpins these challenges. It proposes two pathways—"dynamic adaptive policy design" and "a new international cooperation framework"—to address the central question:"How to construct a multinational collaborative path for power system transformation under the global low-carbon economy initiative."