The best alternative for energy generation is next generation nuclear power (fast-reactors). They combine safety, efficiency, and a small land footprint into an ideal power system.
These next generation reactors, such as the sodium-cooled integral fast reactor (IFR), are extremely safe because if the cooling goes bad, the reactor safely shuts down based on the laws of physics. These reactors also recycle their own waste on site so the nuclear material can be used over and over again (a method known as pyroprocessing). There is a very small amount of “waste” product but it can be safely stored and becomes “safe” after less than 100 years (and we know how to store things safely on those time frames vs. thousands of years required for traditional nuclear waste).link