We present a bibliometric study of engineering doctoral theses whose topic of study is renewable energies. The bibliometric study carried out exhaustively examines the production of doctoral theses on renewable energy in the field of engineering in Spanish universities, covering the period between 1977 and 2023. The main objective is to analyse the volume and temporal distribution of these theses, explore its production by authors and directors considering the genre, and extract the most frequent descriptors in the research. Technological innovation and progress in renewable energy production are crucial for social well-being, economic competitiveness, environmental protection and international cooperation, which underlines the importance of these studies. The results show a total of 1,570 valid theses after a thorough purification process, highlighting a significant increase in the production of these starting in 2008, especially in the period 2008-2016. Regarding the direction of the theses, the low presence of women in both authorship and direction stands out, reflecting a male predominance in the field. Despite this, there is a growing trend in female participation in these academic areas. This study provides research and practice with a detailed understanding of the trend and composition of doctoral research in energy engineering in Spain, pointing out important gender dynamics and research topics.
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