This article explores the critical role of energy monitoring and management within the maritime sector, emphasizing the need for sustainable and efficient energy practices to mitigate environmental impacts. The document outlines the significant contribution of maritime operations to global carbon emissions and highlights international regulatory frameworks like the IMO's MARPOL and SEEMP to address these challenges. Advanced energy monitoring systems, such as nanogenerators and IoT-enabled devices, are discussed as transformative tools to optimize energy consumption and emissions. The integration of digital technologies, including machine learning and AI-driven optimization models, demonstrates potential for predictive maintenance, real-time energy usage analytics, and enhanced operational efficiency. By aligning innovative technologies with sustainability goals, the maritime industry can achieve cost reductions, regulatory compliance, and environmental stewardship. This research provides actionable insights for implementing energy-efficient systems and future-oriented strategies in maritime energy management.