Global Renewable Power Expansion to 2030: A Comparative Assessment of Solar PV, Wind, and Hydropower Technologies

Abstract

The global power sector is entering a period of historically rapid renewable-energy expansion. According to the International Energy Agency's Renewables 2025 outlook, almost 4,600 GW of renewable electricity capacity is expected to be added between 2025 and 2030, approximately twice the deployment achieved during 2019-2024. Solar photovoltaic (PV) technology is projected to account for nearly 80% of this expansion, while onshore wind, offshore wind, and hydropower remain essential for resource diversification, system adequacy, and operational flexibility. This article provides a comparative assessment of these technologies using a structured secondary-data methodology that synthesizes the IEA main-case forecast with statistics and evidence from IRENA, the Global Wind Energy Council, the International Hydropower Association, the United Nations Framework Convention on Climate Change, and recent peer-reviewed research. The comparison considers deployment scale, growth dynamics, economic competitiveness, project-development characteristics, geographical concentration, grid-integration requirements, financing conditions, and principal policy risks. The findings show that solar PV possesses the strongest near-term scaling advantage because of modularity, short construction periods, declining equipment costs, and applicability across utility-scale and distributed markets. Onshore wind retains an important role as a mature and cost-competitive source with complementary generation profiles, whereas offshore wind offers high-quality resources but faces pronounced financing, permitting, and supply-chain pressures. Hydropower grows more slowly in capacity terms but provides disproportionate system value through dispatchability, inertia, balancing capability, and long-duration storage, particularly through pumped-storage hydropower. The central conclusion is that the 2030 transition cannot be evaluated solely by comparing installed gigawatts. A resilient low-carbon power system requires coordinated deployment of low-cost variable generation, transmission networks, storage, flexible demand, and dispatchable renewable resources. Policy should therefore move from technology-specific capacity incentives toward integrated system planning, bankable procurement, faster grid development, and differentiated financing support for emerging and developing economies.