The FreightWaves June 2026 State of the Industry Report identifies data centre construction as the strongest flatbed freight growth pocket in a market that is otherwise soft. FreightWaves’ manufacturing upcycle analysis confirmed the operational picture at that point in the cycle: flatbed spot rates approaching $4.32 per mile, flatbed tender rejections above 38%, more than double the all-in market rejection rate, and load postings running as much as 26% above the prior year, at levels not seen since June 2022. DAT Freight Analytics’ Dean Croke described the current flatbed market as being “on fire for 18 months, driven by incredible demand for anything to do with data centers, nuclear power, diesel generation, natural gas power generation.”
This is a domestic US freight story with a direct international import implication that most data centre construction freight 2026 planning processes do not account for. The generators, transformers, cooling infrastructure, prefabricated data hall modules, and high-voltage electrical switchgear that data centre projects require do not originate in the United States. They arrive at a US port, clear customs under an Importer of Record, and then require flatbed or heavy-haul transport from the port to the construction site. The ocean freight leg is already under the rate pressure covered in our October freight rate analysis. The domestic flatbed leg is under the tightest capacity conditions in four years. Both halves of the journey are expensive simultaneously, and the construction project schedule cannot absorb delays in either one.
Why Data Centre Construction Freight 2026 Is the Strongest Demand Pocket in the Market
AI infrastructure investment has created a category of data centre construction freight demand that differs structurally from consumer and retail freight. Consumer freight is cyclical: it rises and falls with inventory cycles, seasonal demand, and consumer sentiment. Data centre construction freight is project-driven: it runs on multi-year capital expenditure commitments that are relatively insensitive to quarterly economic conditions.
FreightWaves describes the current freight market as a “market inversion”: dry van demand is soft, consumer sentiment is declining, and housing construction remains weak. In the same market, flatbed is at its tightest conditions since 2022. The divergence is explained by where the investment is concentrated. AI data centre construction is generating sustained demand for electrical equipment, structural steel, and the heavy industrial goods that move on flatbeds. While the rest of the freight market waits for a consumer demand recovery, data centre construction is providing a non-cyclical freight floor.
The Specific Equipment Driving Flatbed Demand
- High-voltage transformers and electrical switchgear: A hyperscale data centre drawing 100 to 300 megawatts of power requires utility-scale transformers that weigh 50 to 200 tonnes and move on multi-axle heavy-haul flatbed configurations with route surveys, oversize permits, and utility line clearances. Lead times from international manufacturers run 18 to 24 months. Every project is importing these units.
- Diesel and natural gas generators: Backup power systems for data centres run from 1 to 4 megawatts per unit, with large campuses requiring dozens of generators. These move as out-of-gauge or oversized loads on specialised flatbeds. Dean Croke at DAT specifically named diesel generation as a primary demand driver alongside data centres in the current cycle. Emissions certification, not customs clearance, decides whether these can be commissioned once delivered.
- Cooling and HVAC infrastructure: Liquid cooling systems, chillers, and cooling towers for high-density GPU server deployments are large, heavy, and fragile. They require temperature-controlled delivery schedules timed to the construction programme’s readiness to receive them. For liquid-cooled deployments the fluid is a separate chemical import with its own rules.
- Prefabricated data hall modules: Modular data centre construction uses containerised or skid-mounted pre-built modules that arrive at the site ready to interconnect. Meta, Microsoft, and Google have all used modular construction on recent deployments. These modules are large, heavy, and must be placed by crane in precise sequence.
- Uninterruptible power supply systems and battery storage: Large-scale UPS installations for data centres involve battery cabinets weighing hundreds of kilograms each, delivered in coordinated sequences to match installation readiness.
- Structured cabling and containment: Installed early in the fit-out and buried in the fabric of the building, cable is treated as a construction product rather than IT equipment. Its fire classification is judged by a local inspector against a local rule, and the classification systems do not convert between markets.
The Import Compliance Layer That Flatbed Freight Analysis Ignores
The freight industry coverage of data centre construction demand focuses entirely on the domestic transport leg: flatbed spot rates, rejection rates, capacity tightening. What it does not address is the compliance layer that governs the first half of the same equipment journey.
High-voltage transformers for US data centre projects are predominantly manufactured in Germany, South Korea, Japan, and increasingly India and Mexico. Diesel and natural gas generators are manufactured in the US, UK, Finland, and South Korea. Cooling infrastructure is supplied by manufacturers in Germany, Japan, and the US. Prefabricated data hall modules are often manufactured in the UK, Ireland, Germany, and South East Asia. Every unit that arrives at a US port from a non-US origin requires a customs entry filed by a licensed customs broker on behalf of an Importer of Record.
Three Customs Challenges Specific to Data Centre Construction Equipment
Challenge 1: HS Classification for Complex Electrical Equipment
A high-voltage transformer does not have an obvious single HS code. Depending on its voltage range, power rating, cooling method, and function, it may classify under Chapter 85 of the HTSUS at different duty rates. A classification error on a $4 million transformer does not produce a small duty discrepancy. It produces a CBP query, a potential CF-28, a delayed customs release, and a flatbed truck waiting at the port for a piece of equipment that is holding up the construction programme’s critical path. For the HS classification framework for data centre electrical equipment, see our HS Code Finder.
Challenge 2: Valuation on Long-Lead Manufacturing Contracts
High-voltage transformers and large generators are typically manufactured to order on 18 to 24 month lead times under long-term supply contracts. The value declared at US customs is the transaction value at the time of import, which may differ substantially from the original contract price due to raw material cost escalations, currency movements, and specification changes over the manufacturing period. A customs entry that declares the original contract value rather than the actual import transaction value creates a valuation discrepancy that CBP can challenge under 19 USC 1401a. On equipment worth millions of dollars, the duty exposure from a valuation error is material. See our guide to how to calculate landed cost for the full valuation methodology framework.
Challenge 3: Section 232 and Section 301 Tariff Exposure
Structural steel used in data centre construction is subject to Section 232 tariffs on steel products from most origins. High-voltage transformers and large generators sourced from China face Section 301 tariffs that vary by product classification. A data centre developer importing a transformer from a South Korean manufacturer that sources core steel laminations from China may face tariff exposure on the steel component even though the transformer itself originates in South Korea. Confirming the exposure on each major imported component before the purchase contract is signed is an essential step in project budgeting that many procurement teams skip until customs clearance reveals a liability that was always there.
Pro tip: Have engineering and procurement review the substantial transformation rules under US customs law before finalising multi-country supply chains. Where component manufacturing occurs across several countries, the final assembly location must legally qualify as the country of origin under the substantial transformation test. A pre-import origin ruling request to CBP provides certainty before the purchase decision is made.
As an illustration of the exposure: a developer sourcing transformers from a European manufacturer discovered at customs clearance that the core laminations, which account for a significant share of the transformer’s weight, were sourced from a Chinese supplier. The tariff applied not to the full transformer value but to the Chinese-origin steel content assessed as a proportion of the total. The liability was not in the budget, because the purchase contract had been signed without an origin analysis. The lesson is that the substantial transformation review, and where uncertain a CBP binding ruling request, belong in the procurement process rather than the customs clearance process.
Beyond Customs: The Gates That Decide Whether Equipment Can Be Used
Everything above concerns getting equipment across the border. A separate body of rules decides whether it can then be sold, installed and operated, and those rules attach to the equipment category rather than to the shipment. They are also the part of the picture that does not stay inside the United States. A developer building in Mumbai, Johor, Frankfurt or Querétaro faces the same categories of obligation under different instruments, which is why a compliance position built for one market rarely transfers to the next.
Four categories carry requirements that regularly surprise programmes built around hardware procurement. Each is covered in depth in its own guide.
- Cooling systems are a chemical import, not a hardware import. The fluid needs a safety data sheet, a transport classification that may make it dangerous goods, and a PFAS position that differs by market. See importing liquid cooling and coolant.
- Generating sets are governed by emissions certification, not customs clearance. Approval attaches to the engine family, and the markets classify on different axes: the EU by power, India by a published ceiling regardless of duty, the US by installation and use. See importing diesel generators and emissions certification.
- Network security hardware can require an import licence the buyer is not eligible to hold. Encryption is controlled in both directions, and in some markets the authorisation belongs to a qualifying local entity. See importing network security equipment.
- Permanently installed cable is a building material, judged at inspection. Europe grades measured fire behaviour, the United States lists by installation environment, India specifies by composition, and none converts into the others. See importing data centre cabling and fire rating.
The common thread is that clearing the border is only half the question. Permission to use the equipment is the other half, and it is decided by authorities the freight plan never touches.
Running a data centre build with imported plant on the critical path? The classification, the tariff exposure and the product-specific approvals are all settled cheaply at procurement and expensively at the port. Carra Globe acts as importer of record across 175+ countries and works the compliance position alongside the freight plan, before purchase orders are placed.
What the Flatbed Capacity Crunch Means for Construction Project Schedules
The domestic flatbed bottleneck is sharpest at the major gateway ports where data centre construction equipment typically arrives. At the Port of Houston, which handles a significant proportion of Gulf Coast project cargo including generators and transformers for Texas data centre projects, port-to-site flatbed lead times have extended as capacity tightens. At the Los Angeles and Long Beach complex, out-of-gauge heavy-haul equipment faces a double constraint: port congestion from general freight volumes, and specialist carrier availability for oversize moves to inland data centre sites in Nevada, Arizona, and Northern California. At Savannah, which serves the Southeast data centre corridor including South Carolina and Georgia, the same pattern applies. The bottleneck is not the port clearance. It is the domestic flatbed leg from the terminal gate to the construction site.
A data centre construction project has a critical path. The electrical infrastructure must be complete before IT equipment can be installed. The cooling infrastructure must be operational before GPU servers can run at full load. The generators must be commissioned before the facility can go live on backup power. Every delivery that slips because flatbed capacity was not secured in advance pushes the critical path and delays the commissioning date.
Traffix’s April 2026 report forecast freight costs 10 to 15% higher than 2025 for spot-exposed shipments. A project that relies on spot flatbed capacity for critical deliveries is operating in a market where more than one in three tender requests is being rejected. A rejected tender on a transformer delivery does not mean the transformer waits a day. It means finding alternative capacity at spot rates that are at their highest since 2022, on a construction site where every day of delay has a cost.
The intermodal relief that shippers are using as a cost alternative has a specific limitation for this equipment. Oversized and out-of-gauge loads, which include most of the heavy electrical plant in a data centre project, cannot move on standard intermodal rail containers. They require specialised open-top rail flatcars, Schnabel cars for the heaviest transformer moves, or dedicated heavy-haul road transport from day one, and both specialist segments are operating in the tightest capacity conditions in the market. Intermodal volumes are projected to grow 10% year on year in 2026 as shippers seek cost relief, but that growth is concentrated in standard-dimension dry goods, not construction equipment.
| Critical equipment | Domestic freight impact | Compliance risk behind the freight |
|---|---|---|
| Utility transformers | Multi-axle heavy-haul, route surveys, oversize permits | Complex HTSUS Chapter 85 classification, and steel tariff exposure on core laminations |
| Backup generators | Out-of-gauge oversized flatbed configurations | Valuation challenges on long-lead contracts, and emissions certification governing whether the set may be commissioned |
| Liquid cooling systems | Fragile, temperature-sensitive delivery sequencing | The fluid is a chemical import with dangerous goods and PFAS considerations separate from the hardware |
| Prefabricated data hall modules | Crane-timed logistics with no margin for delay | Multi-component origins require country-of-origin verification to avoid cascading tariff exposure |
| Structured cabling | Low freight cost, installed early in the fit-out | Fire classification judged at inspection against a local rule, in systems that do not convert between markets |
Four Actions for Data Centre Construction Equipment Importers
- Confirm import compliance and HS classification on every major equipment item before the purchase contract is signed. The time to identify steel or electrical equipment tariff exposure is before the procurement decision, not when the customs entry is filed. A transformer that looks cheaper from one manufacturer can become more expensive once tariffs are applied. Build the full landed cost including all applicable tariffs before evaluating competing supplier quotes. Our IOR services include pre-purchase import cost analysis for data centre construction equipment across all major origin markets.
- Book dedicated flatbed capacity for critical-path deliveries before equipment arrives at the US port. In a market with 38% tender rejections, assuming spot capacity will be available when your transformer clears customs is not a logistics plan. It is a risk. Identify the critical-path deliveries, confirm their port arrival windows, and secure dedicated flatbed or heavy-haul commitments before the vessel departs origin. Our freight forwarding service coordinates port clearance and domestic delivery on time-critical project schedules.
- Structure procurement contracts to include DDP terms for internationally sourced equipment. A Delivered Duty Paid arrangement for a transformer from Germany or South Korea transfers ocean freight, customs clearance and domestic delivery cost to the provider at a fixed price before the purchase order is placed. With ocean rates elevated against Q4 2025 levels and flatbed rates at four-year highs, locking cost certainty at commitment removes budget risk from both legs at once. See our Delivered Duty Paid service.
- Audit the customs entries on equipment already imported under the current tariff environment. Tariff list expansions have extended exposure to product categories that were previously exempt. A programme that began importing in 2024 under a specific rate may now face different exposure on the same equipment from the same origin. CBP can assess duties on entries for up to five years, so a proactive classification review identifies retrospective exposure before CBP’s targeting system does. See our guide to the CBP customs audit environment.
Frequently Asked Questions
Does a data centre construction project need a separate IOR for construction equipment?
Not necessarily, but the compliance requirements for construction equipment and IT hardware are different enough that they should be reviewed separately.
A high-voltage transformer, a diesel generator, and a server rack all require an Importer of Record on the customs entry. The HS codes, duty rates, applicable tariff measures, and product-specific certifications differ for each category. An IOR with operational experience in IT hardware may not have experience with utility-scale electrical equipment. Confirm capability across both categories before committing a programme to a single provider. The same split applies to the product-specific rules, which attach to the equipment category rather than to the shipment.
Why are high-voltage transformers specifically on long lead times?
They are custom-engineered to the voltage, power rating and cooling configuration of each project, and global manufacturing capacity is heavily booked by the data centre and renewable energy buildouts running simultaneously.
The current shortage is not a supply chain disruption in the traditional sense. It is a structural capacity constraint. Manufacturing capacity for utility-scale transformers has not expanded proportionally to simultaneous demand from AI data centres, grid modernisation, solar and wind interconnection, and offshore wind. Lead times of 18 to 24 months from major manufacturers in Germany, South Korea and Japan are common in 2026. A project that has not placed transformer orders at least 18 months before the planned energisation date is at risk of commissioning delay regardless of how well everything else is managed.
How does flatbed capacity tightening affect imported equipment specifically?
Imported equipment faces a compound delay risk: a hold at the port of entry, followed by flatbed capacity delays on the domestic leg to the construction site.
A unit that experiences a customs hold on arrival misses its reserved flatbed delivery window. In a tight rejection environment, rebooking a slot for a critical oversized load can take days or weeks. The result is a unit sitting in a bonded warehouse accruing storage costs while the construction programme waits. Coordinating clearance and delivery timing requires import compliance capability and domestic freight relationships operating together.
How should data centre construction budgets account for the current freight environment?
Build the full landed cost for every imported equipment item before the purchase contract is signed, and carry a freight contingency on spot-exposed deliveries in the current market.
Traffix’s April 2026 analysis forecast freight costs running 10 to 15% above 2025 levels for spot-exposed shipments, with flatbed tightening further as construction and industrial demand intensifies. The landed cost includes ocean freight, port clearance, IOR fees, applicable duties and tariff exposure, domestic flatbed or heavy-haul delivery, and any specialist handling or crane requirements at the delivery site. A budget that captures only the equipment purchase price and a nominal freight estimate will underperform materially against actual project costs.