Technical Due Diligence

Technical Briefing // Bankable Technical Due Diligence for M&A

Navigating utility-scale solar and BESS transactions within highly complex European power markets demands absolute technical certainty. STG Nations delivers comprehensive, investor-grade Technical Due Diligence (TDD) that uncovers hidden operational liabilities, validates asset performance claims, and de-risks multi-million euro portfolio acquisitions.

1. Rigorous Independent Yield & Generation Audits

We strip away aggressive seller-side data room assumptions, replacing them with independent, risk-adjusted performance models that institutional lenders trust.

• P50/P90 Cash Flow Recalibration: Independent validation of PVsyst files and solar resource datasets using multi-decade ground-station and satellite meteorological data.
• Advanced Loss Factor Optimization: Re-modeling unquantified sub-hourly losses, including high-frequency inverter clipping truncation, real-world tracker backtracking deviations, and grid curtailment projections.
• BESS Degradation & RTE Verification: Auditing battery state-of-health (SoH) profiles, capacity fade curves, and full-system AC-to-AC Round-Trip Efficiency (RTE) to protect long-term revenue models.

2. Comprehensive Field Asset Inspections

Desktop data rooms rarely reflect actual physical field realities. Our engineering teams deploy specialized testing protocols to assess the structural and electrical integrity of operational or ready-to-build (RTB) assets.

• Advanced Electroluminescence (EL) & Thermography Audits: Utilizing high-resolution drone thermography and string-level EL testing to isolate micro-cracks, PID effects, diode failures, and cell-level thermal anomalies.
• Power Quality & Substation Inspections: Auditing central inverter performance, transformer health, and protection systems against strict transmission system operator (TSO) grid-code mandates.
• BESS Thermal Safety Diagnostics: Verifying cooling loop balance, liquid-coolant integrity, and early-stage off-gas safety detection systems to mitigate thermal runaway liabilities.