So, first, "REN21" is the acronym for the "Renewable Energy Policy Network for the 21st Century". REN21 is a non-profit network of stakeholders established to connect key contributors from governments, international organizations, industry partners/associations, participants from science and academia, and society at large. We are using their centralized information base to expose the diverse approaches that countries can take to develop energy generation and manage energy demand at the Federal level.
After reviewing the REN21's Renewables GSR, you will have a little broader perspective on the various approaches, and will be able to compare solar policies in Germany vs. China vs. Columbia vs. Kenya.