Banking BESS
BESS project finance runs on contracts: availability guarantees, capacity tests, and warranty curves that define what a battery should deliver. This report tests those specifications against operational data from 50+ operating battery projects, and finds consistent, measurable gaps between what the contracts promise and what the assets actually deliver. The difference between the best and worst performers comes down less to age, supplier, or chemistry than to how early problems are caught and fixed.
For most of the last decade, BESS finance has been underwritten on models. Availability guarantees, capacity tests, and warranty curves are agreed at close, then rarely tested against what the asset delivers once it is energized. As portfolios mature and refinancing conversations begin, that blind spot becomes a financing problem: the parties funding these projects increasingly want evidence, not assumptions.
This is where independent operational data changes the conversation. ACCURE monitors more than 24 GWh of BESS capacity worldwide, tracking how batteries actually perform across markets, chemistries, and contract structures. For BESS financing, that means availability, efficiency, and degradation can be verified rather than assumed, warranty entitlements can be evidenced rather than argued, and the return profile a lender or investor signed up for can be tracked across the life of the asset. This report distills what that data means for anyone structuring, funding, or refinancing BESS project finance.