Let's break down several key renewable energy resources and what investors can look forward to in the 2020s. : Renewable and clean energy technologies are already seeing historic levels of investment in the early 2020s, and there's plenty of growth left to go and the last several years proved turbulent for the energy industry as a whole, including trials during COVID lockdowns. However, in 2023, a clearer course emerged for renewable energy in key markets around the globe.