Trends and insights in renewable energy research: a comprehensive bibliometric analysis (2000–2023)
Authors: Sharma Prashant , Sengar Anita 
Published: November 2024

Purpose
The primary aim of this study is to analyze the evolution and future trajectories of renewable energy research from 2000–2023. By examining publication volumes, citation patterns, geographical and institutional landscapes, and identifying key authors and publications, the study seeks to provide a detailed overview of the developmental trajectory of renewable energy research. It aims to serve as a crucial reference for researchers, policymakers and stakeholders in the energy sector, offering insights that can guide future research directions and policy decisions.

Design/methodology/approach
This study uses a comprehensive bibliometric analysis of renewable energy literature spanning from 2000 to 2023, using the Scopus database. Advanced tools such as the visualization of similarities viewer were used for in-depth exploration of influential papers, authors, keyword clusters and thematic connections through hierarchical cluster analysis. The study targeted various publications specifically mentioning “renewable energy” and “renewable energies” in their titles, examining publication trends, research areas, geographic origins, institutional affiliations, funding patterns, journal contributions and citation impacts.

Findings
The analysis reveals robust growth in renewable energy research, with a significant increase in publications over the last two decades. Key contributing countries include the USA, China, the UK, Germany and Spain, demonstrating strong international collaboration. High citation counts and influential journals such as Energy Policy and Renewable and Sustainable Energy Reviews underscore the significance of the research. However, a notable gap in the literature concerning the branding and marketing of alternative fuels was identified, highlighting the need for future research in strategic marketing and consumer engagement aspects of renewable energies.

Research limitations/implications
The study is limited by its reliance on the Scopus database, which may not capture all relevant publications, and the predominance of English-language documents, potentially introducing language bias. The quantitative focus of bibliometric methods may overlook qualitative aspects of research contributions. Future studies should incorporate diverse databases, languages and qualitative analyses to fully capture the global and multifaceted nature of renewable energy research, addressing these limitations and providing a more comprehensive understanding.

Practical implications
The insights from this study can inform policymakers and stakeholders about the key trends, influential entities and emerging directions within renewable energy research. Understanding the predominant research themes and influential journals can aid in strategic decision-making and resource allocation. The identification of gaps in the literature, such as the branding and marketing of alternative fuels, can guide future research and policy efforts to enhance public acceptance and broader adoption of renewable energy technologies.

Social implications
The study highlights global collaboration and communication in renewable energy research, facilitated by the predominance of English as a lingua franca. This international cooperation is crucial for the integration of innovative ideas and solutions across different regions. Addressing the identified gap in consumer engagement and strategic marketing can improve public perception and acceptance of renewable energy technologies, ultimately contributing to the global transition to sustainable energy sources and mitigating climate change impacts.

Originality/value
This study offers a unique and comprehensive bibliometric analysis of renewable energy research, providing valuable insights into publication trends, key contributors and thematic connections over the past two decades. By identifying gaps in the literature and suggesting directions for future research, the study adds significant value to the field. It serves as a crucial reference point for researchers, policymakers and stakeholders, enhancing their understanding of the evolution and future trajectories of renewable energy research.