The accelerating pressures of climate change, energy security, and economic volatility have made energy efficiency and systematic energy management central pillars of sustainable development strategies across industrial and building sectors. Despite decades of technological progress, a persistent gap remains between theoretical energy saving potential and actual implementation of efficiency measures. This research investigates the role of structured energy audits, energy management systems, and regulatory frameworks as instruments to bridge this gap. Drawing exclusively from internationally recognized standards, policy documents, and peer reviewed empirical studies, the article develops a comprehensive theoretical and applied understanding of how energy auditing practices shape decision making, technological adoption, and long term decarbonization pathways in industrial and public building contexts. The study synthesizes normative standards such as UNICEI TR 11428 and ISO 50002 principles with operational experiences from industrial case studies, including automotive manufacturing and small and medium enterprises. By examining the economic, organizational, and technical dimensions of energy audits, this article demonstrates that energy efficiency is not merely a technological challenge but a governance and behavioral transformation process. Special emphasis is placed on the harmonization of audit methodologies, the integration of renewable energy considerations under national technical standards, and the strategic use of audits to inform capital investment and policy compliance. The findings show that when audits are embedded within energy management systems and supported by institutional frameworks, they lead to sustained reductions in energy intensity, operational costs, and emissions. Conversely, audits conducted as isolated compliance exercises fail to unlock their full potential. The research also explores the growing importance of audit driven benchmarking, digital monitoring, and policy evaluation in accelerating the energy transition. By presenting a unified analytical framework grounded in established literature, this article provides scholars, practitioners, and policymakers with a deep theoretical and practical reference for designing, implementing, and evaluating energy efficiency strategies in both industrial and building sectors.