The form of renewable energy that has declined in recent years is hydropower. While solar and wind energy have seen strong growth and capacity additions, hydropower generation has decreased recently. In 2023, hydropower generation declined even as solar PV and wind accounted for most of the growth in renewable electricity generation

. This trend reflects a stalling or reduction in new hydropower capacity additions compared to the rapid expansion of solar and wind technologies

. Other renewable technologies like geothermal, concentrated solar power (CSP), and ocean power have also experienced limited growth or stagnation but have not shown a clear decline like hydropower

. In summary, hydropower is the renewable energy form that has declined recently, while solar and wind continue to grow strongly and dominate new renewable capacity additions globally