Battery energy storage OEMs warrant capacity, guarantee performance, and bear insolvency risk that no standard policy addresses. Renewables Re structures BESS Warranties and Guarantees Insurance across four pillars: Product Warranty, Performance Guarantee, OEM Insolvency Cover, and Availability Guarantee — each backed by AA-rated institutional reinsurance capacity and placed by an EU-regulated broker.
Battery energy storage systems occupy a coverage gap in the insurance market. Standard property policies cover fire and physical damage — but not warranty costs or performance shortfall. OEM warranty enforcement against major Asian BESS manufacturers is expensive and uncertain. And availability shortfall under grid services contracts generates liquidated damages that no standard policy addresses. BESS Warranties and Guarantees Insurance was designed specifically to close all four gaps.
BESS OEMs warrant their systems against defects and commit to defined maintenance cost envelopes. In practice, battery module failures, BMS faults, and thermal events generate warranty repair and replacement costs that exceed the estimated maintenance budget. Standard insurance does not cover warranty cost overrun — it covers physical damage caused by an external event. Product Warranty Cover fills this gap, responding to above-deductible warranty cost overruns that the OEM absorbs up to the agreed deductible but cannot finance beyond it.
BESS capacity degrades with every charge-discharge cycle and through calendar ageing. Manufacturers warrant usable capacity at a defined degradation curve — typically 70–80% remaining at end of warranty period. In practice, real-world operating conditions can accelerate degradation beyond warranted curves. When capacity falls below contracted dispatch obligations — grid services contracts, capacity market agreements, or PPA storage commitments — the asset faces revenue shortfall and potential contract breach. Manufacturer warranty enforcement against major Asian BESS OEMs is expensive, slow, and uncertain. Performance Guarantee Cover and OEM Insolvency Cover address both routes to failure.
BESS assets generate revenue through grid frequency response, capacity market payments, arbitrage dispatch, and PPA obligations. Operational downtime from BMS software failure, inverter faults, communication failures, or planned maintenance translates directly into lost revenue from missed dispatch windows. Grid services contracts contain liquidated damages clauses for availability failures. Unlike solar assets, BESS can be dispatched at any hour — a 24-hour outage during peak grid stress can erase a week's revenue. The Availability Guarantee pillar provides structured cover for this revenue gap.
BESS Warranties and Guarantees Insurance is structured around four distinct coverage pillars — each responding to a specific risk that standard market policies cannot address.
Insures against excessive warranty costs — a higher volume of repairs and replacements than the estimated maintenance budget anticipated. The structure: proven maintenance costs are budgeted and absorbed by the OEM up to a deductible; planned and routine maintenance continues as normal; costs above the deductible that exceed the estimated maintenance curve are what the insurance responds to. This is not a blanket warranty replacement — it is a structured cost-overrun product calibrated to the OEM's own maintenance model.
Responds to early or sudden capacity fade — the battery system degrading faster than the warranted degradation curve, rather than cost overruns on routine repairs. This is the cover that protects against a systemic or technical shortfall in delivered capacity over time. Where Product Warranty Cover covers the cost of keeping the system running, Performance Guarantee Cover covers the revenue impact when the system cannot deliver what was contracted.
The end customer — the project SPV — benefits directly from the insurance in the event the BESS OEM becomes insolvent, with no obligation on the project owner to make any co-payment. This is what protects the OEM's own bankability with its customers and their lenders: the warranty obligation survives even if the OEM itself cannot honour it directly. For project financiers, this cover converts OEM counterparty risk from a deal-breaker into a manageable, insured exposure.
Rather than a single blended availability percentage guarantee, Renewables Re structures this as a parametric index broken down by the specific factor causing the shortfall — Round-Trip Efficiency (RTE) deviation, downtime penalties, or a composite availability index — since each factor carries a different risk profile. Each factor can be penalised as a percentage of the guaranteed value or as a fixed amount. This structure gives much greater clarity and reduces disputes at claims stage compared to a single blended availability number. Note: this fourth pillar is Renewables Re's broker recommendation and requires validation with the capacity reinsurer before confirmation.
BESS Warranties and Guarantees Insurance is a four-pillar programme addressing the distinct risk profile of battery energy storage systems — from above-deductible warranty cost overruns through to capacity degradation shortfall, OEM insolvency, and parametric availability cover.
Insures BESS manufacturers against excessive warranty costs — repairs and replacements exceeding the estimated maintenance budget. The OEM absorbs costs up to the agreed deductible (the planned maintenance envelope); costs above the deductible that exceed the warranted maintenance curve are what the insurance responds to. A structured cost-overrun product calibrated to the OEM's own maintenance model, not a blanket warranty replacement.
Pillar 1 · CoreResponds to early or sudden capacity fade — the battery system degrading faster than the warranted degradation curve. Insures the revenue gap when actual usable battery capacity (measured by IEC 62619 discharge test) falls below the OEM-warranted curve. Pays on a revenue basis — contracted MWh dispatch capability × energy price — not cell replacement cost.
Pillar 2 · CoreThe project SPV benefits directly from this cover in the event the BESS OEM becomes insolvent — with no obligation on the project owner to make any co-payment. Warranty obligations survive even if the OEM cannot honour them directly. For project financiers, this cover converts OEM counterparty risk from a deal-breaker into a manageable, insured exposure backed by AA-rated institutional reinsurance.
Pillar 3 · CoreStructured as a parametric index broken down by the specific factor causing availability shortfall — Round-Trip Efficiency (RTE) deviation, downtime penalties, or a composite availability index. Revenue loss from BMS failure, inverter downtime, communication outage, or AC/DC conversion faults triggering the index below the agreed floor. Each factor carries a different risk profile and penalty structure for greater claims clarity.
Pillar 4 · OptionalWhere the insured BESS asset holds a Capacity Market agreement (UK CM, EU equivalent) or grid frequency services contract, BESS Warranties and Guarantees covers liquidated damages payable to the grid operator or offtaker for availability failures arising from insured events — protecting the asset owner from contractual penalty exposure. Can be combined with Pillar 4.
Optional Add-onBESS Warranties and Guarantees Insurance serves every participant in the BESS value chain who bears warranty cost, capacity performance, OEM counterparty, or operational revenue risk — from BESS manufacturers and project developers to lenders and grid services operators.
BESS OEMs and system integrators use BESS Warranties and Guarantees Insurance to transfer warranty liability off their balance sheet — converting open-ended warranty obligations into a defined, insured exposure. Distributors of multinational OEMs use the same structure to backstop the warranty commitments they carry locally, enabling them to offer bankable guarantees in CEE markets without retaining concentrated counterparty exposure to an upstream manufacturer.
Battery storage developers use BESS Warranties and Guarantees Insurance to create bankable performance certainty — converting uncertain OEM warranty enforcement into a structured, insured capacity floor backed by AA-rated reinsurers. OEM Insolvency Cover (Pillar 3) eliminates the largest uninsured counterparty 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. BESS Warranties and Guarantees Insurance provides lenders with an insured revenue floor (Pillar 2) and OEM insolvency protection (Pillar 3) that together protect loan-to-value ratios and DSCR covenants through the full term of a battery storage financing.
Operators of BESS assets under Capacity Market agreements, frequency response contracts, or ancillary service obligations use the Availability Guarantee (Pillar 4) to protect against liquidated damages exposure and revenue loss from unplanned downtime — turning unpredictable operational risk into a managed, insured parametric liability.
Four documented cases showing the financial exposure BESS OEMs, distributors and project owners face — and how BESS Warranties and Guarantees Insurance responds to each risk.
Between 2017 and 2019, South Korea recorded 28+ BESS fires across multiple OEMs. Samsung SDI systems were implicated at 23 sites. The government MOTIE investigation found cell-level manufacturing defects alongside installation issues — leaving Samsung SDI facing warranty disputes, reputational damage, and a government-mandated nationwide safety retrofit programme.
Varta AG, one of Europe's largest battery manufacturers, filed for formal insolvency in July 2026 with Varta Storage GmbH (its BESS division) in scope. Creditors pushed for a break-up sale. Customers who had purchased BESS systems backed by Varta's manufacturer warranty faced an immediate question: who honours the warranty when the OEM no longer exists?
Powin Energy filed for Chapter 11 bankruptcy in June 2025 with USD 100M–500M in liabilities. Critically, Powin's proprietary StackOS software was embedded in over 2 GW of deployed BESS globally. Operational continuity — and warranty validity — depended on Powin remaining solvent. FlexGen ultimately acquired the business, but customers faced months of operational uncertainty.
GivEnergy UK entered administration in April 2026, immediately voiding all outstanding manufacturer warranties. The Energy Storage Association issued guidance to homeowners and installers. A large installed base of residential and small commercial BESS — sold with 10-year performance warranties — was left with no warranty recourse on day one of administration.
Indicative policy parameters for BESS Warranties and Guarantees Insurance. All terms are subject to underwriting and risk assessment. Contact us for a tailored quotation across any or all four coverage pillars.
| 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. |
| Minimum operational history | Layer 1 (Thermal): new systems accepted subject to commissioning certification. Layer 2 (Capacity): 12 months SoH baseline required. Layer 3 (BI): 6 months dispatch data required. |
| Policy term | 1 year (renewable) to 15 years (fixed, aligned to project finance or long-term grid services contract) |
| Capacity trigger mechanism | IEC 62619 standardised discharge test to rated capacity at 25°C, conducted by accredited laboratory at policy anniversary. Trigger threshold agreed at inception based on OEM warranty curve. |
| Deductible — thermal layer | First loss deductible: 5–10% of insured replacement cost (risk-based; reduced for facilities with FireDome/Kidde Class D suppression systems and 24hr monitoring) |
| Deductible — capacity layer | Annual aggregate: degradation within OEM warranted curve is excluded. Cover attaches at first MWh of capacity loss below warranted floor. |
| Deductible — BI layer | Time deductible: 24–48 hours of downtime (excludes planned maintenance windows scheduled ≥72 hours in advance) |
| 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 (HIB Re / Renewables Re) |
| Pre-inception requirements | State of Health (SoH) testing report; commissioning test data; BMS specification and alarm log review; suppression and monitoring system certification; O&M contract review; grid connection agreement |
| Settlement | Thermal claims: 30-day assessment period from incident report; payment within 45 days. Capacity claims: 30 days from IEC 62619 test results. BI claims: monthly rolling assessment during outage period. |
Send us your BESS specifications, OEM warranty documentation, SoH baseline data, and grid services contracts. We will assess the risk across all four coverage pillars — Product Warranty, Performance Guarantee, OEM Insolvency Cover, and Availability Guarantee — and return an indicative premium within 10 working days.
BESS Warranties & Guarantees · 2-page PDF overview