IST · Integrated Systems Test
The final commissioning level (L5) that proves all facility systems work together under simulated full load.
Current numbers
CM / FT outcomescommissioning IST outcome: maintain load through required maintenance and fault tests under the selected standard's defined conditions
L1–L5electrical commissioning level taxonomy (factory test -> integrated systems test)
~1,500 MWlarge-load loss over a six-fault, 82 s sequence on a 230 kV line (NoVA, Jul 2024; NERC Level 3 alert 2026) — the ride-through problem IST must prove against