Phase 6 is the **final chapter** of the inZORi Power Flow Delta (PFΔ) research series. It scales the validation from IEEE 118-bus to the **case1354pegase Pan-European network** (1354 buses, 1991 lines, ~73 GW nominal) — an 11× larger system used in ENTSO-E-affiliated research. A systematic load sweep from 1.18× to 1.30× nominal across 3 seeds discovers the precise **critical load threshold**: at exactly **1.25× (~91.4 GW)**, Newton-Raphson collapses to 0% S3 convergence on ALL 3 seeds while inZORi FrozenElite maintains **99.9%** — a **+99.9pp advantage**. **Key Results (3 seeds, 6 load scales):** - Sharp critical threshold at 1.25× nominal: NR = 0%, inZORi = 99.9% — reproducible on all 3 seeds - inZORi extends operable load range by ~5.5%: from 1.22× (both work) to 1.27× (inZORi only) - Below 1.22×: all methods equivalent (~100%) — inZORi adds no overhead in normal conditions - Above 1.30×: all methods fail — inZORi cannot solve physically infeasible systems - 11× larger network than Phases 1–5 (1354 vs 118 buses) — advantage holds at scale - 54 jobs completed in 290s on 12 cores — production-ready computational efficiency **Significance:** This is the first demonstration of an adaptive bio-inspired solver maintaining near-perfect convergence where NR completely fails on a realistic Pan-European grid model, establishing the practical utility of evolutionary warm-start strategies for real-time security assessment. **Limitations:** case1354pegase is an academic benchmark, not the actual European transmission grid. Load scaling is uniform across all buses. **Related publications:** - Phase 1: https://doi.org/10.5281/zenodo.18716837 - Phase 2: https://doi.org/10.5281/zenodo.18717007 - Phase 3: https://doi.org/10.5281/zenodo.18735120 - Phase 4: https://doi.org/10.5281/zenodo.18735099
Dumitru Novic (Fri,) studied this question.