ECO STOR Bollingstedt BESS Independent Audit (103.5 MW) - VolMax P10 Verification

This repository contains the independent verification dataset and reproducible analysis pipeline for the dynamic grid operations claims of the ECO STOR 103.5 MW Bollingstedt battery storage system (BESS). The audit was conducted under the VolMax P10 Verification Protocol using 13 months of operator-published dashboard data (June 2025 – June 2026). Key Verification Findings: Physical Grid Limits (ES-01): Verified with limitations. A total of 180 deviations (0.47% of intervals) were detected. Findings are consistent with the suppression of multi-megawatt operational exceedances following the introduction of the FCA regime in July 2025. Night-time deviations collapse to sub-MW levels consistent with auxiliary consumption (hypothesis; the data cannot confirm the physical mechanism). Regime Shift (ES-02): Verified with limitations. Double CUSUM changepoint analysis indicates an operational transition, with allowed discharge power limit activity detecting the shift on July 5, 2025 (Cohen's d = 1.063), while BESS dispatch volume exhibits a delayed transition due to seasonal factors. Netzdienlichkeit (ES-03): Consistent with PV-driven Netzdienlich Operations. The BESS exhibits a statistically significant negative correlation with regional PV output (r = -0.3005), peaking during summer months, while wind correlation was mathematically negligible. This correlation is observationally indistinguishable from price-driven arbitrage charging. The upload contains the full Level 1 (Integrity) and Level 2/3 (Physics/Claims) verification logic (verify_claims.py), the generated JSON metrics, and the immutable SHA-256 hashed audit report. Raw dashboard data remains the property of the BESS operator.