I'm a huge fan of renewables. Basically the technology is hear to go 100% green. What's really missing are big government incentives to speed up the process. That's something that really makes me sad.
I'm a fan of cheap renewables. You can actually heat your house for free by building solar collectors yourself from scrap. There are many projects like that with the cheapest ones being built with just plastic water bottles and some tubing. If you manage to build panels yourself, you can save a lot of money each year and get instant ROI, because you won't have to put any money into the project.