Nuclear energy is the most efficient power source we currently have that is renewable

It is also a lot safer than it used to be, and you can build a plant basically anywhere. All the other alternatives rely on having to have a specific location/natural mechanism in order for them to work. Nuclear energy is also the fastest and best way to combat fossil fuel usage and coal power plants, and ultimately climate change. It's a proven and constantly advancing field that has not been embraced enough.
Nuclear waste is stored and managed extremely efficiently these days, and isn't even if concern anymore.