Technical Due Diligence Best Practice Guidelines for Hybrid Utility Solar PV & Battery Energy Storage Systems

18 February 2026

The Technical Due Diligence (TDD) Best Practice Guideline provides an industry-first unified framework for assessing the technical, legal, environmental, financial viability, and bankability of hybrid utility-scale solar and battery storage projects from initial planning, through all project stages.

Robust and transparent due diligence processes, i.e. ‘health checks’, performed by technical advisors or engineers are essential to maintain the integrity, financial viability, sustainability, and long-term reliability of hybrid systems.

 

For the first time, SolarPower Europe’s new Technical Due Diligence Guidelines offers a complete guide for supporting stakeholders on how to evaluate the full-lifecycle feasibility, bankability, and performance of hybrid solar PV and battery storage projects across their entire lifecycle.

 

All best practices mentioned in these reports are beneficial and relevant for utility-scale hybrid solar PV and battery storage projects. These guidelines are a key tool for O&M service providers, technical advisors, project developers, owners, and financiers, investors, lenders, asset owners, asset managers, monitoring tool providers, policymakers, and all interested stakeholders in Europe and beyond.

 

In these guidelines, over 30 experts of SolarPower Europe’s Lifecycle Quality Workstream, have illustrated their knowledge and experience from across the solar sector, coming from Operations & Maintenance (O&M), EPC, engineering, recycling and circularity, waste management, utility-scale solar, and manufacturing backgrounds. 

Technical Due Diligence Best Practice Guidelines for Hybrid Utility Solar PV & Battery Energy Storage Systems

This report provides an industry-first unified framework for assessing the performance of hybrid utility-scale solar and battery storage projects from initial planning, through all project stages.

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