This threshold is met the year we build a fusion reactor that has run continuously for at least 24 hours at engineering breakeven (Q_E >= 1).

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/RemNi/will-we-get-fusion-reactors-before-d18e9fd38cd1

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Engineering breakeven is defined here: https://en.wikipedia.org/wiki/Fusion_energy_gain_factor#Engineering_breakeven

The fusion reactor must have been built by human civilization or one of its descendants in order to qualify in the context of this question.