The article examines the economic essence of digital transformation in the energy sector and analyzes methods for assessing its economic efficiency. The study substantiates the impact of digital technologies on energy companies, including cost reduction, minimization of energy losses, improvement of production efficiency, and enhancement of investment attractiveness. The concepts of digitization, digitalization, and digital transformation are compared, and their economic content is revealed. The main evaluation methods of digital transformation projects are analyzed, including the KPI system, scenario analysis, cost–benefit analysis, investment appraisal tools (NPV, IRR, payback period), and the integrated efficiency assessment model.