Here, look: take case 11 from this study by Sargent and Lundy[1](PDF): an AP1000 fission reactor, 2.156GW, $6041/kW, swap out the fission reactor for fusion generation at $0, and show us how to get to $176/kW (a tenth the per-kW price of a small-scale PV plant with battery storage, case 25).

Also note the construction timetables: 72 months vs 18 months for PV.

1. EIA 2020, Capital Cost and Performance Estimates for Utility Scale Power Generating Technologies: https://www.eia.gov/analysis/studies/powerplants/capitalcost...