Exploring sustainable energy solutions, Nano Encapsulated Phase Change Materials (NEPCM) have demonstrated significant potential in heat and mass transfer and thermal energy storage. A scientometric study investigated trends and categories in NEPCM research from 2002 to 2023, revealing an exponential growth since 2005, peaking in 2021 with 66 publications. The study encompassed 397 records, refined to 343, with 94.5% being original research articles. China is leading in contributions with 123 publications (35.9%), followed by Saudi Arabia, with King Khalid University producing 31 publications. “Journal of Energy Storage” is the primary source with 40 publications (11.7%). Keyword analysis focused on phase change materials, nanoencapsulation, and thermal energy storage. The research was categorized into six segments, with Synthesis of Nanoparticles being paramount (56%), and diverse computational techniques and Radiation’s impact on NEPCM performance also emphasized. 82% of studies in the “Enhancement” category showed increased heat transfer through techniques like Nanoencapsulation. Natural/Free Convection dominated “Convection Type” research (46%), and Porous Media and Clear Flow were significant in “Medium Type,” contributing to 78%. This study unveils the growth, diverse methodologies, and applications in NEPCM, laying a foundation for future advancements in sustainable energy solutions.