likely extend into the 2040 timeframe to complete...
Fossil Fuels are definitely here to stay...but not for burning...GEN-IV Advanced Nuclear Reactors, which are now funded and under development will begin operation in six to eight years...Wind, Solar and Hydro will also play a role in so far as their 'Variability' can be taken into account...as for Fusion Reactors, while I was just getting started working on Fast Breeder Reactors in the mid-1970s, we were given a presentation by a representative of the Lawrence Livermore Lab on that subject...let's just say that we wish them every success, but our transition away from FFs is not dependent on Fusion for success.
One thing for certain...FFs are definitely "Finite"...we need to make the switch...no time like the present.