It is nice to see that the industry are moving forward and also focusing on "burning issues" that has received a lot of criticism in the past. I hope other Bitcoin mining operations will take note about the changing environment and they will also shift their operations to run on "clean" and renewable energy sources.
It is not 100% sustainable to use the renewable energy sources and they costs a lot considering the build up areas based on the type of energy farm. For windmills you need acres of stretches to have enough energy which can run mining farm smoothly. There is no guarantee it will produce the energy 24x7. Sometimes nature can be angry upon us giving to 0% output on the bad day!
Im not against using the energy which is clean but mining operation need mega energies and they need stable electricity to have proper hash rates.
But surely they must go on building the renewable energy plants which may benefit them with the operations and also nature at the same time.
About the coinbase: Yeah the forum itself is flooded with the topic of coinbase so can imagine the popularity and attention is growing for the same.