I love a good listicle. This is a pretty good summary of policies that have proven to affect real growth in clean energy technologies. The one with the most potential is large, stationary, and cheap battery technology. While H2GO Power competes with batteries in the portable power market (and fuel cells are a great alternative to the low energy density issues with lithium-ions), I'm a broad supporter of cheap batteries' ability to help modulate renewable variability on a large scale for stationary sources like buildings. Go CleanTech!
There’s no denying it: cheaper batteries are like winning lottery tickets. They make electric cars much cheaper, and they make energy storage for solar and wind power more competitive, which make solar and wind power more competitive. Luckily, there are dozens of good companies as well as dozens of research institutes working to improve battery chemistries. Furthermore, economies of scale from the growing battery market are bringing down cost as well. Cheaper batteries are going to be a big part of the low-carbon economy, and they are arriving!