The European energy transition is accelerating with the growth of hybrid solar-plus-storage projects, which are becoming more complex and require rigorous technical due diligence to ensure reliability, investor confidence, and a resilient clean-energy transition. SolarPower Europe has developed new guidelines for these projects, integrating environmental and social governance, supply chain sustainability, cybersecurity, and financial risk analysis. Technical due diligence is crucial for earning trust in asset performance and ensuring a resilient, bankable, and sustainable clean-energy future in Europe.