Unimasters | 13/07/2026
The vessel sticks to its ETA. The containers clear customs without delay. The trucks deliver to site on the agreed date. And the project can still forfeit its subsidy, because "delivered" and "commissioned" are separated by weeks of work that fall outside the supply contract's delivery terms. Who pays for that slip is decided at signature, not at the quayside.
Series
The Buyer's Desk: The Commercial Decisions That Decide a BESS Project
The gap between "delivered" and "commissioned" is where subsidy deadlines die, and the question of who absorbs that cost is decided long before the first container is booked.
The decision is how the supply contract and logistics agreement allocate financial responsibility for a missed grid connection or subsidy deadline. This allocation is locked in at three points: the liquidated damages clause in the supply contract, the service level agreement (SLA) with the logistics provider, and the decision to purchase (or not purchase) Delay in Start-Up (DSU) insurance.
Each instrument covers a different slice of the timeline, and the gaps between them are where project economics collapse.
Three instruments exist to allocate delay risk. Each covers a different cause, a different party, and a different portion of the project timeline.
The supply contract with the system integrator typically includes a liquidated damages clause tied to a Guaranteed Delivery Date. If the integrator delivers late, they pay a penalty that accrues per day of delay, usually capped at a percentage of the contract value. The clause covers delays caused by the supplier: manufacturing problems, quality failures at Factory Acceptance Testing (FAT), or shipping delays where the supplier controls the logistics under CIF or DAP Incoterms 2020.
The limitation: LDs only apply to delays caused by the supplier. Once the goods are delivered to the named place under the contract, the supplier's exposure ends. Under DAP (Delivered at Place), risk transfers when the goods are placed at the buyer's disposal, ready for unloading. Under FOB (Free on Board), risk transfers when the goods cross the ship's rail at the port of loading. The supplier is not liable for customs delays, inland transport problems, or commissioning failures that occur after delivery.
A service level agreement with the freight forwarder may include performance commitments: transit time guarantees, documentation accuracy, or delivery windows. Breach of these commitments may trigger service credits or, in some contracts, liability for direct losses.
DSU insurance (also called Advance Loss of Profits or ALOP) covers the financial consequences of delayed project completion resulting from insured physical damage. If a covered event (fire, collision, equipment damage during erection) delays the Commercial Operation Date (COD), DSU pays the gross profit, debt service, or fixed costs that would have been earned during the delay period.
The limitation: DSU only responds to physical damage. It does not cover slow performance, late delivery of materials, inadequate funding, regulatory delays, or commissioning failures unrelated to physical damage. The policy has a time excess (deductible period), typically 30 to 90 days, before coverage begins. And DSU explicitly excludes fines and penalties, meaning subsidy clawbacks are not covered.
The gap that procurement teams routinely miss is the difference between "delivered" and "commissioned." A BESS project has three distinct milestones, and the supply contract typically addresses only the first:
The supply contract's Guaranteed Delivery Date covers milestone one. The EPC contract's Guaranteed Completion Date covers milestone three. The period between them, which includes customs clearance, inland transport, installation, cold commissioning, hot commissioning, and grid acceptance testing, is where delays accumulate and where contractual coverage often disappears.
Industry data shows that 37% of BESS projects miss their planned commissioning timelines, with delays ranging from one to eight months. According to analysis from the EPRI BESS Failure Incident Database, integration, assembly, and construction issues account for 36% of all BESS failures. More striking: 72% of failures occur during construction, commissioning, or within the first two years of operation.
These are not shipping delays. They are commissioning delays: Battery Management System (BMS) calibration failures, inverter communication errors, fire suppression system integration problems, grid code compliance testing failures. The supplier delivered on time. The logistics provider delivered on time. The project still missed its COD.
For CEE projects funded under the EU Modernisation Fund or national RESTORE-equivalent schemes, the subsidy deadline is not the delivery date. It is the commissioning date. Romania's battery storage subsidy scheme, approved by the European Commission in March 2026, requires projects to reach commercial operation before 31 December 2030. The penalty for missing that deadline is not a per-day fee. It is the loss of the entire subsidy allocation.
The supply contract's liquidated damages clause does not cover this exposure. The supplier's obligation ends at delivery. If the project misses the subsidy deadline because commissioning took longer than planned, the buyer absorbs the loss.
DSU insurance appears to fill this gap, but the policy language is precise. DSU covers financial loss caused by delayed start-up resulting from insured physical damage. The key phrase is "insured physical damage." A BMS calibration failure is not physical damage. A grid code compliance test failure is not physical damage. A delay in obtaining the grid connection agreement is not physical damage.
DSU also excludes fines and penalties. If the subsidy scheme imposes a clawback for late commissioning, that clawback is not covered. The policy pays for lost revenue during the delay period, not for the penalty imposed by the funding authority.
Under Incoterms 2020, the risk transfer point determines when the supplier's exposure ends and the buyer's exposure begins. For BESS shipments from Asia to CEE, the most common terms are:
None of these terms extend the supplier's liability to commissioning. The supplier delivers equipment. The buyer commissions a project. The gap between those two events is the buyer's risk.
A 230 MWh BESS project in Bulgaria, funded under the Modernisation Fund, contracted for delivery CIF Burgas with a Guaranteed Delivery Date of 15 September 2026. The supply contract included liquidated damages for late delivery, capped at 10% of contract value. The project's subsidy agreement required COD by 31 December 2026.
The containers arrived at Burgas on 12 September 2026, three days earlier. Customs clearance took 3 working days (documentation was complete). Inland transport to the construction site, 180 km from port, took 4 days including permit processing. The equipment reached site on 23 September 2026.
Installation proceeded on schedule. Cold commissioning began in mid-October. During hot commissioning, the BMS reported inconsistent State of Charge readings across multiple battery racks. The integrator's field team diagnosed a firmware calibration issue that required a software update from the cell manufacturer. The update was delivered in late November. Re-commissioning and grid acceptance testing extended into January 2027.
The project missed its subsidy deadline by three weeks. The supplier had delivered on time. The logistics provider had delivered on time. The DSU policy did not respond because there was no physical damage. The liquidated damages clause did not apply because the Guaranteed Delivery Date was met.
The subsidy clawback was the buyer's loss.
1. Define the Guaranteed Date as COD, not delivery. If the supplier resists, negotiate a Guaranteed Mechanical Completion Date that includes installation and cold commissioning, with liquidated damages that extend beyond the delivery milestone.
2. Require the supplier to provide commissioning support with defined response times. Specify that firmware updates, BMS recalibration, and integration troubleshooting are included in the contract scope, not treated as warranty claims.
3. Cap liquidated damages at a level that reflects actual project exposure, not just a percentage of equipment cost. If the subsidy value exceeds the equipment value, the LD cap should reflect that.
4. Confirm that the forwarder's SLA includes documentation accuracy commitments. Customs delays caused by incorrect tariff classification (HS 8507.60.00.90 for batteries, separate classification for PCS) or mismatched weight documentation (Packing List vs. VGM) are preventable.
5. Require the forwarder to provide realistic transit time estimates that account for current routing. As of July 2026, Asia-to-Black Sea transit via Cape of Good Hope routing takes 55 to 70 days to Burgas or Constanța. Direct services via Suez are available but less frequent, with transit times of around 35-40 days.
6. Understand what DSU covers and what it excludes. DSU responds to physical damage, not to commissioning delays, regulatory delays, or performance failures. If the project's primary risk is commissioning timeline, DSU does not address it.
7. Consider whether the project requires a separate policy for subsidy protection. Some markets offer political risk or contract frustration coverage that may address subsidy clawback scenarios. These are specialist products requiring broker expertise.
8. Build the commissioning buffer into the delivery schedule, not the other way around. If COD is required by 31 December, work backward: 4 to 6 weeks for commissioning, 1 to 2 weeks for inland transport and customs, 55 to 70 days for sea transit. The booking window for Q4 2026 COD closed in Q2 2026.
For a structured approach to this decision, the BESS Delivery Deadline Allocation Matrix maps each delay scenario to the responsible party and applicable instrument.
Q: What is the difference between a Guaranteed Delivery Date and a Commercial Operation Date (COD)?
A: The Guaranteed Delivery Date is when equipment arrives at the named place under the supply contract (e.g., CIF Burgas). COD is when the system passes performance tests and begins commercial dispatch. The gap between them, typically 4 to 8 weeks for BESS projects, includes installation, commissioning, and grid acceptance testing.
Q: Does DSU insurance cover commissioning delays caused by software or firmware problems?
A: No. DSU (Delay in Start-Up) insurance only responds to delays caused by insured physical damage. BMS calibration failures, firmware issues, and integration problems are not physical damage events and are excluded from standard DSU policies.
Q: Under DAP Incoterms 2020, when does risk transfer from seller to buyer?
A: Risk transfers when the goods are placed at the buyer's disposal at the named destination, ready for unloading. The seller bears transit risk but not import clearance, unloading, or any activities after the goods arrive at the named place.
Q: Are subsidy clawbacks covered by DSU insurance?
A: No. DSU policies explicitly exclude fines and penalties. If a project misses its Modernisation Fund or RESTORE deadline and faces a subsidy clawback, that loss is not covered by DSU insurance.
Q: How long does BESS commissioning typically take after equipment arrives on site?
A: For utility-scale BESS projects, commissioning typically takes 4 to 6 weeks from equipment arrival to COD. This includes cold commissioning (de-energized testing), hot commissioning (energized testing), and grid acceptance testing. Delays of 1 to 8 months are common when integration issues arise.
Q: What should the supply contract include to protect against commissioning delays?
A: The contract should define the Guaranteed Date as COD or Mechanical Completion (not just delivery), require the supplier to provide commissioning support with defined response times, and set liquidated damages caps that reflect actual project exposure including subsidy value.
Next in the series
DAP or DDP decides who is importer of record, who owes import VAT and who answers for misclassification - long before the container reaches Burgas.
