Hi, I'm not sure what is the appropriate procedure for proposing new predictions (haven't done it before!) but I've got one for the timeline.
2030-2040: Generation IV Nuclear Power Plants Are Coming Online
By the 2030s, a new generation of nuclear power plants begins to come into use.* These new power plants have a number of advantages over previous generations. For one thing, they are capable of using their nuclear fuel up to two orders of magnitude more efficiently than previous nuclear reactor generations. They are also capable of "burning" their nuclear waste, meaning that what waste they produce becomes non-radioactive in mere centuries, as opposed to millennia.* Other innovative technologies in fourth-generation nuclear reactors include thorium-based reactors and breeder reactors, the latter of which allows nuclear fission to become a form of renewable energy.*
Feel free to expand this entry and/or make stylistic corrections before posting in the main timeline.