This study examines the convergence of financial technology and renewable energy financing through systematic bibliometric analysis. Organizations face mounting pressure to mobilize capital for clean energy transitions while reducing financing costs, yet lack structured frameworks for understanding how FinTech innovations enable this transformation. Analyzing 255 documents from Scopus database (2017–2025) using VOSviewer software, we investigate the intellectual structure of this emerging field. The analysis reveals exponential research growth from 2 publications in 2017 to 72 in 2025, demonstrating intensified scholarly momentum. Four distinct thematic clusters emerge through keyword co-occurrence networks: energy transition economics integrating investment and crowdfunding mechanisms, sustainable FinTech applications in climate innovation, systemic analysis of technological development impacts, and climate policy frameworks linking environmental sustainability with financial instruments. Sustainable development dominates the research landscape, particularly within digital finance contexts. However, significant gaps persist regarding empirical quantification of capital cost reduction mechanisms, regulatory frameworks for cross-border FinTech deployment, and equity implications of technology-enabled energy financing. This research bridges digital finance literature and green energy economics, providing actionable guidance for practitioners evaluating FinTech solutions that balance sustainability objectives, capital efficiency, and financial inclusion imperatives.