This study examines the effect of financial efficiency and Depth on the expenditure on renewable energy in Nigeria. This study adopts ex-post facto research design because the data for the study is already stored in the data base of World Development Indicator (WDI) which cannot be altered by any researcher. The population of the study comprises of data from the Nigerian economic factor which includes financial development index relationship to financial access and efficiency as well as the expenditure on renewable energy which are biomass, hydro, wind and solar technologies. The sample period that is adopted is from 1988 to 2023 (35 years). The data collected was analysed using Autoregressive Distributed Lag Estimation Techniques for data analysis. However, the long run test result shows that the coefficients of the specifications estimated using ARDL approach and based on the results, financial depth (2.0837) has a positive relationship with the dependent variable but are insignificant due to its p-value (0.4747) being greater than 5% respectively while financial efficiency (-4.5956) has a negative relationship with the dependent variable with an insignificant p-value (0.1999) because it is also greater that than 5%. In the light of the findings this study recommends that improve Financial Efficiency to Facilitate Renewable Energy Investments. Financial institutions should streamline their processes, reduce bureaucratic bottlenecks, and lower transaction costs related to renewable energy financing and deepen Financial Markets to Support Green Financing Options. Deepening the financial system by expanding green bond markets, promoting renewable energy-focused venture capital funds, and encouraging innovative financing mechanisms such as crowdfunding for clean energy projects can enhance the financial depth needed to drive significant investments.
Keywords: Expenditure, Financial Depth, Renewable Energy, financial efficiency
