Tracing the history of terrestrial fusion energy to a giant multinational experimental fusion facility under construction reveals a series of consequential failures, re‐evaluations of once defunct designs, but also persistence. To account for how this vast enterprise, dogged by failure, endures, I suggest that different ontological narratives re‐orientate the enterprise both temporally and vis‐à‐vis different forms and valences of failure. Thus the rhetoric of mission‐driven project vies with that of open‐ended, present‐focused experiment: the former is positioned as the crucial solution to the threat of climate change; the latter ‘bakes in’ virtuous failure as integral to creative practice. Visionary promise moves to a focus on the meanwhile. Finally, the sheer unfurling size to which attention is constantly drawn offers a disorientating spectacle, denying perspective or closure and acting to suspend judgements of failure.