Solar Annual % Growth The annual percentage growth of renewable energy generation varies from year to year and across different countries. However, it is generally increasing at a significant rate globally. According to the International Renewable Energy Agency (IRENA), the average annual growth rate of renewable energy capacity between 2010 and 2019 was around 8.4%. This growth is being driven by factors such as declining costs, policy support, and increasing awareness of the need to transition to cleaner and more sustainable energy sources.