Fusion (particularly DT fusion) is grossly overvalued as an energy source. It's been an element of the consensus futurology (which is why you see it as a trope in SF stories), but this placement is not deserved by its actual qualities.

Renewables make much more sense. At the experience curve for utility scale PV from 2010 to 2022, assuming that experience rate of 33.1% decline per doubling of cumulative deployment would continue, if the world were powered by PV the levelized cost of delivered power would fall to $0.003/kWh.