Other forms of renewable energy

As we have discovered in the past blog posts, solar and wind energy are both very reliable and a great step forwards in becoming completely renewable when I come to energy. In this post we will learn about a few other forms of renewable energy. Some of which are very efficient while other and just as efficient but more of a hassle to obtain. The first former we will talk about is hydroelectric energy. That word may sound crazy but ithe is actually fairly simple. Hydroelectric is simply a turbine that is spun by water being carried downhill by gravity. You always see huge dams and wonder what they are for. Well, this is it. water is carried through these spinning massive turbines which create a lot of power. The water is then sent somewhere else whether it be the other side of back where it came from to be used again. Hydroelectric can be used in Colorado with the Big Thompson river or the Poudre river. The next form isnt exactly renewable but is pretty close. This is hydrogen and the reason I have it on here even though it isn't renewable is that there is an abundance of it. Hydrogen can be used as a fuel in cars to replace gasoline and it has very little pollutants. Hydrogen can also be made into fuel cells, which are basically just batteries, to power electric cars. This is a crazy thought but if you know how electric cars are made then you'll know the factories making their batteries produce nearly as much pollutants aso gas ando diesel vehicles. What if these factories were powered by hydrogen or some sort of clean fuel. This would make the production and product be both clean. The final form I will go over is very efficient but just barely out of our reach to use. This is hydrogen fusion and plasma. We have all the technology to make this possible AND have but not for a sustained period of time. With temperatures reaching 1x10^6K, or 1.8 million degrees Fahrenheit, you can see why this was only sustained for .1 seconds. If we are able to find ways to contain and or lower this heat then this form of Energy will be very powerful.
Of all the forms I've talked about, which do you believe would be the most beneficial to us?
Source:
http://www.altenergy.org/renewables/renewables.html
http://phys.org/news/2016-07-wendelstein-x-successful.html