Fusion power is roughly 20 years away from being viable...and has been for the last 40 years LOL.
Longer than that. Fusion power has been hyped since the 1950s. From the article:
Nuclear fusion could come into play as soon as 2050
Heard that one before.
Fusion power has some real problems. After half a century of trying, nobody has a long-running sustained fusion reactor, even an experimental one. The whole "inertial fusion" thing turned out to be a cover for bomb research. There's a lot of skepticism about whether ITER will do anything useful. It's not clear that a fusion reactor will be cost-effective even with a near-zero fuel cost. (Fission reactors already have that problem.) It's really frustrating.
Fusion reactors are a pain to engineer. They have a big vacuum chamber with high-energy particles reacting inside, and huge cryogenic magnets outside. This is far more complicated than a fission reactor, and is why the cost of ITER keeps going up.