Global Energy Investment Trends and the Clean Energy Transition: A Comparative Assessment of Capital Flows from 2015 to 2024

Abstract

Global energy investment has entered a period of structural change in which capital increasingly favors clean technologies, electricity networks, storage, electrification, and efficiency. This article assesses the evolution and composition of global energy capital flows between 2015 and 2024 using a descriptive and comparative review of the International Energy Agency's World Energy Investment 2024 dataset and analysis. The assessment compares clean energy and fossil-fuel investment, examines technology-level shifts, evaluates regional disparities, and reviews the changing sources of investment and finance. Global energy investment is expected to exceed USD 3 trillion in 2024, of which approximately USD 2 trillion is directed toward clean energy technologies and infrastructure. Solar photovoltaic investment alone is projected to exceed USD 500 billion, while grid expenditure is expected to reach about USD 400 billion. Nevertheless, the transition remains highly uneven. Emerging market and developing economies outside China account for only around 15% of global clean energy spending, and battery-storage investment is particularly concentrated in advanced economies and China. Fossil-fuel capital also remains substantial, including approximately USD 570 billion in upstream oil and gas investment in 2024. The findings indicate that the transition is progressing in aggregate but remains constrained by grid bottlenecks, high financing costs, unequal access to capital, weak investment in low-emission fuels, and geographic concentration. A credible transition therefore requires accelerated network and storage investment, lower financing costs in developing economies, stronger development-finance participation, and policy frameworks that align private capital with energy security, affordability, and climate objectives.