Battery energy storage systems represent the fastest-growing capital asset class in the energy transition — and one of the least understood by insurers. GridGuard™ guarantees what matters most to lenders and operators: the capacity your battery was contracted to deliver. When measured output falls below the OEM warranted curve — or when the OEM disputes your warranty claim — GridGuard™ pays. Structured as a bankable performance guarantee, backed by AA-rated reinsurance capacity.
Battery energy storage systems face two coverage gaps that standard insurance cannot fill. Property policies cover physical damage — not performance shortfall. OEM warranties are contractual promises, not insurance instruments — they can be disputed, delayed, or become worthless if the manufacturer faces financial stress. GridGuard™ was designed specifically to close both gaps with a bankable, reinsurance-backed performance guarantee.
BESS capacity degrades with every charge-discharge cycle and through calendar ageing. Manufacturers warrant usable capacity at a defined degradation curve — typically guaranteeing 70–80% remaining capacity at the end of the warranty period. In practice, real-world operating conditions — temperature extremes, depth of discharge, charge rate, and cell manufacturing variance — can accelerate degradation well beyond the warranted curve. When measured capacity (per IEC 62619 test protocol) falls below the contracted dispatch obligation, the asset generates less revenue than underwritten. Standard property insurance does not respond to performance shortfall — it only responds to physical loss.
BESS manufacturers provide capacity warranty instruments — but a manufacturer warranty is a contractual claim, not insurance. Enforcing it requires the OEM to acknowledge the shortfall, agree the cause lies within their responsibility, and have financial capacity to pay. Major Asian BESS manufacturers routinely dispute degradation claims on grounds of operational conditions, charge protocol deviations, or temperature management failures. The claim process takes 12–36 months and frequently ends in partial settlement or arbitration. If the OEM is acquired, restructured, or becomes insolvent — a real risk in the consolidating BESS manufacturing industry — the warranty becomes worthless paper. GridGuard™ OEM Backstop pays when the OEM doesn't.
BESS systems are complex electromechanical assets with multiple failure modes — BMS software faults, inverter failures, DC-AC conversion faults, communication outages, and thermal management failures. When a breakdown occurs, recovery requires specialist engineers, replacement components (often from Asia with 6–16 week lead times), and mobilisation costs that are not covered by standard property or engineering policies. The recovery cost exposure on a utility-scale BESS can reach €500K–€2M per incident — a direct cost to the operator that falls between property insurance (no physical loss) and warranty (no OEM responsibility). GridGuard™ Recovery Cost add-on closes this gap.
GridGuard™ — Performance Guarantee Architecture
Capacity Warranty · OEM Backstop · Recovery Cost — one coordinated programme
GridGuard™ is a modular BESS performance guarantee covering three risk layers — capacity performance warranty, OEM warranty backstop, and breakdown recovery cost — each with its own defined trigger and claim settlement pathway. All layers are placed with AA-rated reinsurance backing and can be purchased individually or as a combined programme.
GridGuard™ underwriting begins with a full BESS health assessment — State of Health (SoH) testing, BMS data extraction, cycle history analysis, and electrochemical characterisation of cell degradation. This establishes the insured capacity baseline and actual degradation rate at inception. For new systems, the OEM datasheet and commissioning test data form the baseline; for operating assets, 12 months of operational dispatch data are required. This baseline drives capacity warranty trigger thresholds and deductible structure.
The capacity layer triggers when measured usable capacity — assessed annually using standardised IEC 62619 discharge testing — falls below the agreed OEM warranty curve floor. The indemnity equals: (warranted capacity − actual capacity) × contracted revenue per MWh of dispatched capacity × the remaining dispatch window of the measurement period. This structure ensures the insured receives the revenue they were contracted to earn on the full warranted capacity, not a nominal replacement value for the lost cells.
The OEM Backstop layer triggers when the manufacturer's warranty process fails to deliver the warranted entitlement — whether through claim dispute, partial settlement, or OEM insolvency. GridGuard™ pays the shortfall between the warranted entitlement and the OEM payment actually received, up to the agreed sublimit. The trigger requires written confirmation of the OEM's position: a denial letter, a partial settlement offer, or confirmation of insolvency or administration. This layer can be triggered from commissioning — no baseline period is required.
The Recovery Cost add-on triggers on confirmation of an unplanned BESS breakdown event — BMS fault, inverter failure, DC-AC conversion fault, communication system outage, or thermal management failure. An attending engineer's report confirms the event. Covered costs include specialist engineer mobilisation, replacement components at verified market cost, recommissioning and certification costs, and temporary monitoring during recovery. A 24-hour time deductible excludes planned maintenance windows. This layer covers direct repair costs — not revenue loss.
GridGuard™ is a three-layer BESS performance guarantee addressing the core financial risks of battery energy storage systems — capacity warranty, OEM backstop, and breakdown recovery cost.
The core layer triggers when an independent IEC 62619 capacity test confirms the BESS is delivering less than the OEM warranted capacity at that point in the degradation curve. GridGuard™ calculates the indemnity as the revenue shortfall attributable to the measured capacity gap over the indemnity period, plus any augmentation cost required to restore the system to the warranted capacity level. Annual SoH (State of Health) testing by an accredited independent engineer is required. The policy term aligns to the BESS project finance tenor — up to 15 years.
Layer 1 · CoreThis layer pays when the OEM warranty process fails to deliver — whether because the manufacturer disputes the claim, attributes degradation to operational conditions outside the warranty scope, reaches only partial settlement, or is unable to pay due to insolvency or corporate restructuring. GridGuard™ acts as the insured's warranty enforcement partner: we fund the shortfall between warranted entitlement and OEM payment, up to the agreed sublimit. Enforcement costs and arbitration fees are covered up to a separate sublimit. This layer is particularly critical for projects financed under project finance structures where lenders require warranty performance certainty.
Layer 2 · CoreThe add-on Recovery Cost layer covers the direct out-of-pocket costs of restoring a BESS asset to service following an unplanned breakdown event — BMS software failure, inverter fault, DC-AC conversion failure, communication system outage, or thermal management system failure. Covered costs include: specialist BESS engineer mobilisation (including international attendance where required); replacement components at verified market cost; recommissioning testing and certification; and temporary monitoring equipment costs during the recovery period. This layer does not cover revenue loss — it covers the repair and recovery cost that falls outside property insurance (no physical loss event) and outside OEM warranty (operational failure).
Layer 3 · Add-onGridGuard™ serves every participant in the BESS value chain who bears performance, capacity, or breakdown cost risk — from project developers and OEMs to lenders and grid services operators.
Battery storage developers use GridGuard™ to create bankable performance certainty — converting uncertain OEM warranty enforcement into a structured, insured capacity floor backed by AA-rated reinsurers. Eliminates the largest uninsured risk in a BESS project finance structure.
Banks and infrastructure lenders financing BESS assets face a collateral risk unique to battery technology: as capacity degrades, asset value falls independently of market conditions. GridGuard™ capacity warranty cover provides lenders with an insured revenue floor that protects loan-to-value ratios and DSCR covenants through the full term of a battery storage financing.
Operators under Capacity Market agreements and frequency response contracts use GridGuard™ to guarantee warranted capacity is delivered and to cover direct repair costs when unplanned BESS downtime occurs — costs that fall outside standard property insurance and OEM warranty.
The following cases illustrate the types of performance and warranty risk that GridGuard™ is designed to address. These are composite case studies based on documented market patterns. Individual operator details are withheld for confidentiality.
A Central European grid services operator deployed a fleet of eight BESS assets across three countries under capacity market agreements and frequency response contracts. All systems were warranted by the OEM to maintain at least 80% of nameplate capacity at year 5. Independent SoH testing at year 3 showed capacity ranging from 68% to 74% across the fleet — materially below the warranted curve. The shortfall translated directly into capacity underperformance: the assets were unable to dispatch at contracted volumes during peak frequency events, exposing the operator to potential capacity market penalties and shortfall claims under their grid services contracts. The operator filed warranty claims with the OEM — a major Asian battery manufacturer — which disputed the degradation attributing it to operating temperatures and cycling frequency outside the warranty operating envelope.
GridGuard™ Capacity Performance Warranty was triggered by the IEC 62619 independent test results. The indemnity was calculated as the revenue shortfall attributable to the measured capacity gap over the 12-month indemnity period, plus an augmentation cost contribution to restore two of the eight systems to warranted capacity through cell module replacement. In parallel, the GridGuard™ OEM Backstop layer funded continued warranty enforcement proceedings against the OEM, including independent expert costs. Total indemnity paid: within 35 days of test result submission.
The operator maintained its capacity market obligations throughout the dispute period, avoided liquidated damages exposure under its grid services contracts, and ultimately reached a partial settlement with the OEM — with GridGuard™ covering the gap between warranted entitlement and OEM payment. The case demonstrated the core GridGuard™ thesis: OEM warranty instruments alone are not bankable. Insurance backstop is required.
A 50 MW / 100 MWh utility-scale BESS project in the UK, financed under a project finance structure with senior debt from a major UK infrastructure lender, experienced accelerated capacity degradation in year 2 of operation. The asset was under OEM warranty for 10 years. Eighteen months into the degradation dispute process, the battery module manufacturer entered administration — its European subsidiary ceased operations as part of a parent company restructuring. The outstanding warranty claim became a general creditor claim in the insolvency estate, with recovery expected at 5–15 pence in the pound over a 3–5 year period. The lender's debt service cover ratio had already been stressed by the revenue underperformance; the OEM insolvency threatened to trigger a technical default under the project finance facility.
GridGuard™ OEM Backstop triggered on confirmation of the manufacturer's insolvency. The layer paid the full warranted entitlement (less the recovery expected from the insolvency estate) within 60 days of the OEM administration appointment. The payment was structured as a direct assignment to the project finance SPV, satisfying the lender's DSCR covenant and avoiding technical default. GridGuard™ continued to monitor the insolvency proceedings and will credit any future recovery against the paid indemnity.
The project finance facility remained current. The BESS asset continued operating under a replacement monitoring and augmentation programme funded in part by the GridGuard™ indemnity. The lender subsequently included GridGuard™ OEM Backstop as a condition of new BESS project finance term sheets — citing OEM credit risk as a material project risk requiring insurance mitigation.
Indicative policy parameters for GridGuard™ BESS Capacity Performance Guarantee & OEM Backstop. All terms are subject to underwriting and risk assessment. Contact us for a tailored quotation.
| Parameter | Detail |
|---|---|
| Eligible assets | Utility-scale BESS (≥500 kWh / 250 kW); commercial BESS (≥100 kWh) subject to underwriting review; co-located solar+storage and standalone storage accepted; AC- and DC-coupled configurations |
| Battery chemistries | Lithium iron phosphate (LFP), lithium NMC/NCA, vanadium redox flow (VRFB). Lithium-sulfur and solid-state: moratorium pending 2026 review. NaS accepted subject to risk assessment. |
| Covered perils | Capacity performance shortfall (measured below OEM warranted degradation curve) · OEM warranty dispute/denial/insolvency (OEM Backstop layer) · Breakdown recovery cost (add-on layer) |
| Minimum operational history | Capacity layer: 12 months SoH baseline required. OEM Backstop: from commissioning (no baseline required). Recovery Cost: from commissioning. |
| Policy term | 1 year (renewable) to 15 years (fixed, aligned to project finance or long-term grid services contract) |
| Trigger mechanism (capacity) | Independent IEC 62619 capacity test · Annual State of Health assessment · Minimum 12 months operational baseline required |
| Trigger mechanism (OEM backstop) | Written OEM claim denial or partial settlement · OEM insolvency or administration confirmed · Trigger within 90 days of OEM decision |
| Trigger mechanism (recovery cost) | Confirmed unplanned breakdown event · Engineer attendance report · 24-hour deductible |
| Deductible — capacity layer | Annual aggregate: degradation within OEM warranted curve is excluded. Cover attaches at first MWh of capacity loss below warranted floor. |
| Deductible — recovery cost | 24-hour deductible for breakdown events; planned maintenance windows excluded |
| Maximum sum insured | €100M per site (combined layers); portfolio aggregation available up to €300M with reinsurer approval |
| Geographic scope | Czech Republic, Slovakia, Poland, Hungary, Romania, Croatia; United Kingdom; broader EU/EEA subject to reinsurer approval |
| Reinsurance | 100% ceded to AA-rated institutional reinsurer; ČNB-licensed broker (Renewables Re) |
| Pre-inception requirements | State of Health (SoH) testing report; commissioning test data; BMS specification and alarm log review; O&M contract review; grid connection agreement; OEM warranty documentation |
| Settlement | Capacity claims: 30 days from IEC test results. OEM Backstop: 60 days from OEM final determination. Recovery Cost: 14 days from incident confirmation. |
Send us your BESS specifications, SoH baseline data, and grid services contracts. We will assess the risk, commission the health evaluation, and return an indicative premium across all three coverage layers within 10 working days.