Considering who's putting money into ignition research and alternative modes of fusion (General Fusion vs Tri-Alpha Energy for example) I'd say we should have a

Considering who's putting money into ignition research and alternative modes of fusion (General Fusion vs Tri-Alpha Energy for example) I'd say we should have at least one successful ignition experiment on or before 2020. I would honestly be shocked if nothing of note in that regard didn't happen by 2030 though.