@Framemaker- Fusion energy reactors are actually not that far off from being functional. Fusion has some serious benefits to fissions, and fusion energy research has come a long way in the last decade. The hopes are to create a deuterium-deuterium reactor (deuterium is a hydrogen atom with one neutron versus tritium, which has two neutrons).
Deuterium-deuterium reactions produce more energy than current fusion technology, but require higher temperatures and pressure to produce. Deuterium is also easier to produce than tritium. Deuterium is easily found in seawater while tritium needs to be synthesized from lithium, a metal important to other industries like battery production. Additionally, deuterium is not radioactive, making it an appealing fuel source.
Fusion reactors may not be around yet, but they will likely be operational in the next few decades. There is a current international effort to build a fusion reactor in France for the purpose of producing energy.