In short
AI data center construction contracts rely on a tight chain of promises, tests, and bonds to make sure the finished building actually delivers the power, cooling, and uptime the owner paid for. The contract spells out performance guarantees for things like megawatt capacity, temperature control, redundancy, and tier certification. A structured commissioning process, usually six levels of testing from factory checks through full integrated system failure drills, verifies every one of those promises before the owner accepts the facility. On projects touching federal land or federal money, the Miller Act requires performance and payment bonds that protect the government and subcontractors and can override some of the private contract’s risk limitations. Understanding how all these pieces fit together matters because a missed test or a badly written exclusive remedy clause can leave an owner with a building that falls short and no practical recourse.
What performance guarantees does an AI data center contract require?
The performance guarantees in a construction contract for an AI data center tell the builder exactly what the finished facility must do. They go far beyond ordinary building completion. A typical set of guarantees covers several areas at once.
Power and cooling capacity. The contract requires the completed AI data center to deliver the contracted number of megawatts of critical IT load while keeping air and liquid temperatures within a specified range under full load. For example, a 100 MW campus might be built in phases, and the contract for each phase guarantees that the electrical and cooling systems can sustain the promised power draw without exceeding specified temperature and humidity limits. Law firm analysis
Uptime and availability. Owners often insist on a guaranteed uptime percentage tied to the Uptime Institute’s Tier system. Tier III targets roughly 99.982 percent availability, which means no more than about 1.6 hours of downtime per year. Tier IV targets about 99.995 percent. TechTarget These numbers are industry expectations, not promises from the Uptime Institute itself. Uptime Institute, Myths and Misconceptions Regarding the Uptime Institute’s Tier Certification System
Redundancy and tier certification. A contract might require the design to meet Tier III concurrently maintainable standards, meaning any single component can be taken offline for maintenance without stopping IT operations. Or it might demand Tier IV fault tolerance, where independent systems can absorb a worst-case failure without affecting the critical load. Uptime Institute Often the guarantee is not just about meeting the design on paper. The contract may tie warranty start to Tier Certification milestones and final payment to integrated systems testing completion, with third party verification. Law firm analysis
Temperature and humidity control. AI workloads using dense GPU racks generate enormous heat. The contract adopts specific thermal standards, usually from ASHRAE TC 9.9. For standard IT equipment, the recommended inlet temperature range is 18 to 27 degrees Celsius (64.4 to 80.6 degrees Fahrenheit). For high density AI and GPU equipment, the recommended range narrows to 18 to 22 degrees Celsius (64.4 to 71.6 degrees Fahrenheit) because the dense packaging leaves insufficient room for the larger heat sinks and fans that would be needed at higher temperatures. ASHRAE TC 9.9 Reference Card (5th Edition), Uptime Institute analysis The contract also caps how fast temperature can change, usually no more than 5 degrees Celsius per hour for tape storage and 20 degrees per hour for solid state equipment. Envigilance
Integrated systems testing. A guarantee is only as good as the test that proves it. Most AI data center contracts make owner acceptance conditional on passing a full integrated systems test (IST), sometimes called the black building test. During this test, the facility runs at full load while the commissioning team deliberately cuts the main utility feed. The generators must start, the UPS systems must bridge without a hiccup, and the cooling must ride through the transition. Bluerithm Passing IST confirms the uptime and redundancy promises are real.
These performance guarantees are typically enforced through liquidated damages, a fixed dollar amount the contractor owes for each unit of performance below the guarantee. For example, in solar and biogas EPC contracts, a contract might set a performance liquidated damage (PLD) of a certain dollar amount per 0.1 percent capacity shortfall, capped at 10 to 15 percent of the total contract price. Law firm analysis, Climate Solutions Legal Digest
How the commissioning process verifies each promise
Commissioning is the structured testing sequence that proves the contractor built what the contract promised. It is not a single walkthrough. It is a series of deliberate, color coded checkpoints that start before equipment leaves the factory and end only when the owner accepts a live, fully tested facility.
The commissioning framework
The industry has settled on a six level model (some practitioners count five levels by excluding the design review level, but the backbone is the same). Each level carries a tag color that signals where the equipment is in the testing journey.
| Level | Tag Color | What Happens |
|---|---|---|
| Level 0 | None | Design and planning review. The commissioning team checks drawings and sequences of operation before anything is built. |
| Level 1 | Red Tag | Factory acceptance testing. Equipment is tested at the manufacturer’s site before shipping. |
| Level 2 | Yellow Tag | Delivery, installation, and pre-startup checks. Equipment is verified as installed correctly but not yet energized. |
| Level 3 | Green Tag | System startup and pre-functional testing. Individual pieces of equipment are powered up and basic functions are confirmed. |
| Level 4 | Blue Tag | Functional performance testing. Complete systems are run through their full range of operating conditions to prove they meet design specifications. |
| Level 5 | White Tag | Integrated systems testing. All systems run together under simulated failure scenarios. The black building test happens here. |
CxPlanner, Constructandcommission.com
This framework is not a statute or regulation. It is industry practice. Different owners or commissioning agents may adjust the number of levels or the exact scope at each step, but the progression from factory to integrated test is nearly universal. CxPlanner
The integrated systems test and what it proves
Level 5 white tag testing is where the biggest contractual promises either hold up or fail. The commissioning team writes detailed test scripts that simulate real failures. One classic sequence cuts the main utility breaker while the AI data center is fully loaded. The script checks that the UPS batteries carry the load without interruption, the backup generators start, the transfer switches operate, and the cooling system restarts to keep the room cool. YouTube Five Nines Another script might disable a single chiller or a single electrical distribution path to prove that redundant design actually works.
These tests are resource intensive. They require temporary load banks that can simulate the heat and power draw of the real IT equipment that is not yet installed. For traditional air cooled data centers, resistive load banks are enough. For liquid cooled AI data centers, the test equipment becomes more specialized.
Commissioning liquid cooled AI infrastructure
Many AI data centers now use direct to chip liquid cooling. That means a coolant loop carries heat away from the GPU chips themselves. But the servers are often not in place during commissioning. So the testing team must bring in liquid heat load banks that simulate GPU heat output and circulate fluid through the cooling distribution system. InfraXtructure
The tests do more than check flow rates. They validate that the CDUs can keep pumping through a power loss and that redundant pumps work. Dual power supplies should also be standard, because even a brief interruption in liquid flow can cause chips to overheat in seconds. Even a small pause can trigger thermal throttling. Schneider Electric liquid cooling analysis, CDU commissioning guide, Hybrid load bank commissioning article
There is an extra complication. Direct to chip liquid cooling handles the chips in a typical AI rack, but supplemental air cooling still covers about 20 to 30 percent of the total thermal load. So liquid and air cooling systems must function together with integrated controls, and redundancy must be built in to handle failure scenarios. Avtron Power White Paper, Schneider Electric Blog
A widely noted Schneider Electric white paper lists eight core challenges for direct liquid cooling across specification, installation, and operation. They include material incompatibility that can cause corrosion, conflicting cooling requirements between liquid and air systems, a lack of standards for CDU testing, and warranty gaps when multiple vendors supply parts of the cooling chain. Schneider Electric White Paper 210
Work is underway to close the standards gap. ASHRAE Addendum b to Standard 127-2020, published February 27, 2026, establishes a standardized method of test for rating CDUs. The Open Compute Project has published a 30°C coolant roadmap and leak detection guidelines. OCP coolant roadmap, OCP rope leak sensor specification, ASHRAE Addendum b, LinkedIn PS Lee But for now, each project’s commissioning plan is heavily negotiated between owner and contractor.
Liquidated damages and the exclusive remedy trap
When a performance test fails, the contract typically does not let the owner simply walk away. Instead, the owner collects payment from the contractor through liquidated damages for the performance shortfall. This arrangement gives the owner money to compensate for the lost value and avoids a long fight over actual damages. Climate Solutions Legal Digest
But many EPC contractors push for a dangerous clause. They write the contract so that liquidated damages are the owner’s exclusive remedy for any performance failure. If the clause is not carefully limited, the owner could be stuck with a facility that never meets its guarantees and have no right to require the contractor to fix it, no right to terminate, and no right to sue for anything beyond the liquidated damage check. Law firm analysis
Drafting around this requires care. Owners should carve out at least a few things from the exclusive remedy. For example, performance liquidated damages are designed to compensate for reduced output, not for a complete failure. The remedies associated with performance and schedule guarantees should be narrowly defined so they apply only to the specific failures for which they are intended. A project that satisfies performance guarantees at acceptance but subsequently fails due to faulty design or construction should not be locked into the exclusive remedy. The contract should avoid exclusive remedy provisions and instead make remedies cumulative, so the developer retains recourse if the project fails after acceptance due to faulty design or construction. Law firm analysis
Federal performance bonds on federally linked AI data center projects
The Miller Act is a federal statute that applies when the United States government enters into a contract exceeding $100,000 for the construction, alteration, or repair of a public building or public work. It requires the contractor to post a performance bond and a payment bond. The performance bond protects the government if the contractor defaults. The payment bond protects subcontractors and material suppliers who are not paid for their work. 40 U.S.C. § 3131
The Miller Act’s statutory threshold is $100,000. That means any federal construction contract above that dollar figure triggers the bond requirement. 40 U.S.C. § 3131(b) In practice, the Federal Acquisition Regulation (FAR) has raised the threshold for mandatory bonds to $150,000 for construction contracts, and each bond must equal 100 percent of the original contract price, though the performance bond may be reduced if the contracting officer determines a lesser amount is adequate and the payment bond only upon a written finding of impracticality FAR 48 CFR 28.102-1, FAR 48 CFR 28.102-2. Construction contracts greater than $35,000 but not greater than $150,000 require the contracting officer to select two or more payment protections, which may include a payment bond, an irrevocable letter of credit, a tripartite escrow agreement, certificates of deposit, or certain security deposits. FAR 48 CFR 28.102-1 There is an open point here. The statute still says $100,000 while the FAR applies $150,000. The FAR controls day to day contracting, but the statutory text has not been amended. 40 U.S.C. § 3131(b), 48 CFR § 28.102-1(a)
A subcontractor or supplier who is not paid has a direct right to sue on the payment bond in federal district court. A claimant who has a direct contractual relationship with a subcontractor but no contractual relationship with the prime contractor must give written notice to the prime contractor within 90 days after the last work was performed, and any suit must be filed within one year. 40 U.S.C. § 3133(b) This is a powerful tool. It gives subcontractors a claim against a bond backed by a surety company, even if the general contractor goes bankrupt or the government has already paid the prime contractor.
The Miller Act also lets the contracting officer require additional bonds or other security beyond the statutory minimum. 40 U.S.C. § 3131(e) So on a large or complex AI data center project, the government could demand a bond package larger than 100 percent of the contract price, or require parent company guarantees.
When the Miller Act does not apply, the ground lease problem
The Miller Act only covers a contract to which the United States is a party. That seems simple, but a lot of AI data center development on federal land might not involve the government as a contracting party. For example, a private developer might sign a long term ground lease with a federal agency. The developer then hires a general contractor to build the AI data center. In that situation, the federal government is just a landlord. The construction contract is a private deal between the developer and the contractor. Courts have held that the Miller Act does not attach to such a project. In U.S. ex rel. Roc Carter Co. v. Freedom Demolition, Inc., a subcontractor tried to make a Miller Act claim for demolition work on an Air Force base housing project built under a 50 year ground lease. The federal district court dismissed the claim because the military housing project on land leased by the Government was not a public work of the United States. Surety association case summary
Executive Order 14318, issued in July 2025, directs federal agencies to make federal land available for AI data center projects that require more than 100 megawatts of new load. White House If those projects are structured as ground leases, the Miller Act may not apply. That would leave subcontractors without the federal payment bond protection they would normally have on a direct federal project. The developer would need to arrange private bond or letter of credit protections, or comply with the relevant state’s Little Miller Act if that law covers the deal. All states have Little Miller Acts that impose similar bonding requirements for state and local public projects, but the rules vary. Construction law analysis, Surety bond overview
The Infrastructure Investment and Jobs Act extension
In 2021, Congress extended Miller Act bonding requirements to all TIFIA funded surface transportation projects, closing a gap that had existed for public-private partnerships. Gray Surety That does not directly affect AI data center construction, but it shows a trend of expanding bonding requirements into privately delivered projects that use federal money. A similar extension for federally supported AI infrastructure could happen, though none has been enacted as of the run date.
Gaps between the lease, the construction contract, and the operator
A common source of dispute is the mismatch between what the tenant (often a hyperscaler like a cloud provider) demands in its lease and what the developer’s construction contract can actually pass through to the contractor.
A hyperscaler lease might impose severe liquidated damages, service level credits, and even termination rights on the developer if the facility misses an availability target. The developer in turn signs an EPC contract with a contractor. But the contractor will not accept the full hyperscaler liability. Solar and biogas EPC contracts typically cap performance liquidated damages at 10 to 15 percent of the contract price. Climate Solutions Legal Digest Tenancy agreements often impose heavy liquidated damages while construction contracts cap contractor liability, and the owner operator is rarely able to recover the full difference up the contractual chain. Masin YouTube
This structural gap is a fundamental risk allocation issue. It cannot be eliminated by drafting, only managed. Developers often negotiate for commissioning milestones that align the construction contract’s acceptance tests with the tenant’s lease milestones, so that both parties accept the facility at the same time and on the same evidence. Still, the liability mismatch remains.
Real world failures and what they teach
Two examples show how performance and commissioning failures cascade.
Equinix Singapore, October 2023. During a planned cooling system upgrade, a contractor incorrectly closed chilled water buffer tank valves. Temperatures rose. The data center’s cooling failed. DBS Bank and Citibank suffered outages lasting about two days. The resulting disruption included 2.5 million failed payment and ATM transactions and 810,000 failed digital banking access attempts. The incident illustrates how a single commissioning or maintenance mistake can cause catastrophic downstream consequences, especially when the procedure for isolating equipment is not flawlessly executed and verified. Envigilance
Rogers-O’Brien Construction v. Microsoft, Texas. The contractor claimed that Microsoft’s failure to supply equipment and manage vendors caused cascading delays on a $1 billion data center, and sought more than $34 million in damages. Global Arbitration Review, Broadstaff Global, ENR This shows how owner furnished equipment and supply chain coordination can become the root cause of delay and performance disputes, and how a contractor may use the delays to excuse late delivery or assert its own claims.
Both examples demonstrate why commissioning is not just a technical ritual. It is the legal mechanism that activates or extinguishes performance guarantees, and a failure can expose the participants to enormous financial and reputational harm.
Practical drafting points and open questions
Several points from practice merit attention.
Tie warranty start to tier certification, not substantial completion. One recommended risk mitigation strategy is to require contractor warranties to commence no earlier than Uptime Institute Tier Certification milestones. That way, the contractor remains on the hook for defects discovered during the certification process, and the warranty covers the certified facility. Womble Bond Dickinson
Use independent third party testing firms. Having the commissioning agent be a neutral, experienced firm hired directly by the owner helps catch issues that an EPC contractor’s self testing might miss. The firm writes the scripts, witnesses the tests, and signs off on the results.
Watch the exclusive remedy clause. As noted above, an exclusive remedy tied to liquidated damages must not strip the owner of the right to demand correction of a catastrophic performance failure or to bring a latent defect claim.
Plan for liquid cooling unknowns. Because standards for liquid cooling commissioning are still emerging, the contract should leave room for the commissioning scope to adapt as new testing methods become available. A contract that locks in a fixed test script can become obsolete before the project is finished.
Check whether the Miller Act applies. If the project sits on federal land but the contract is private, subcontractors will not have Miller Act payment bond protection. Developers and lenders should consider requiring private payment and performance bonds or equivalent security even if no statute compels them.
ASHRAE Guideline 1.6 status. ASHRAE is developing a dedicated data center commissioning guideline, GPC 1.6. As of the research date, its publication status could not be confirmed. Once published, it will establish industry best practices for commissioning data centers. ACHR News
Executive Order 14318 impact. The order directs federal agencies to expedite permitting for large AI data centers and to make federal land available. Whether any ground leases have been executed under the order could not be confirmed. If they are structured as true leases, the Miller Act bonding gap noted above will be a recurring concern.
Key takeaways
- Performance guarantees in AI data center contracts must cover power capacity, cooling performance, uptime, redundancy, and successful commissioning testing, not just building completion.
- Negotiate a minimum performance floor below which liquidated damages are not the exclusive remedy and the owner retains the right to reject or compel correction.
- Commissioning follows a structured six level process (Level 0 through Level 5). The integrated systems test at Level 5, including the black building test, is the gatekeeper for owner acceptance.
- Liquid cooled AI racks require specialized commissioning with liquid heat load banks and validation of coolant distribution units under failure conditions. Air and liquid cooling must be tested together.
- On federal construction contracts, the Miller Act requires performance and payment bonds at 100 percent of the contract price. The FAR threshold is $150,000 in practice, though the statute says $100,000.
- The Miller Act likely does not apply when a private developer builds on federal land under a ground lease. Subcontractors then lack federal payment bond protection unless private bonds or state Little Miller Acts fill the gap.
- Align commissioning milestones with hyperscaler lease acceptance milestones to reduce the liability gap between what the tenant demands and what the construction contract caps.
- Tie the contractor’s warranty start to the Tier Certification of Constructed Facility, not to substantial completion.
Frequently asked questions
Q:What is the difference between a performance guarantee and a performance bond in an AI data center contract?
A:A performance guarantee is a contractual promise by the contractor that the completed facility will meet defined performance metrics like megawatts delivered or temperature maintained. A performance bond is a financial instrument issued by a surety company that pays the owner if the contractor defaults on its obligations. The Miller Act requires a performance bond on federal construction contracts over $100,000. 40 U.S.C. § 3131
Q:Do the Uptime Institute tier numbers come with an uptime guarantee from the Institute?
A:No. The Uptime Institute provides a certification that the design, construction, or operations meet the relevant Tier Standard. The uptime percentages (99.671 percent for Tier I, 99.982 percent for Tier III, and so on) are industry expectations based on the design’s redundancy, not contractual guarantees from the Uptime Institute. Uptime Institute
Q:What is the black building test and why does it matter for performance guarantees?
A:The black building test is a Level 5 integrated systems test. With the AI data center running at full load, the commissioning team opens the main utility breaker. The test verifies that the UPS bridges without interruption, the generators start and transfer, and the cooling system restarts within its thermal limits. Passing this test proves the uptime and redundancy guarantees are real. YouTube Five Nines
Q:How are liquidated damages for performance shortfalls calculated?
A:The contract sets a fixed dollar amount for each unit of deficiency below the guaranteed level. For example, a contract might state a specific sum per 0.1 percent shortfall in cooling capacity. Those damages are typically capped at 10 to 15 percent of the total contract price. The exact numbers are negotiated and vary by project. Climate Solutions Legal Digest
Q:Does the Miller Act apply if a private developer builds an AI data center on federal land through a ground lease?
A:Usually not. The Miller Act requires that the United States be a party to the construction contract. If the federal government is only the landowner under a lease, the construction contract is a private agreement and the Miller Act does not apply. This was confirmed in U.S. ex rel. Roc Carter Co. v. Freedom Demolition, Inc. Law firm analysis
Q:Can an owner force a contractor to fix a performance failure instead of just paying liquidated damages?
A:It depends on the contract’s exclusive remedy clause. Many EPC contracts make liquidated damages the sole remedy. Performance liquidated damages are designed to compensate for a performance shortfall rather than a complete failure, so an exclusive remedies provision can leave the developer with no remedy if the project fails entirely. Stahl Sewell
Q:What special commissioning is needed for direct to chip liquid cooling in AI data centers?
A:Commissioning requires liquid heat load banks that simulate GPU heat output. The tests validate coolant flow, CDU pump redundancy, and uninterrupted liquid supply during power transfers. Because liquid cooling only removes part of the heat, the supplemental air cooling must work together with the liquid system. Schneider Electric Blog
Q:How long does AI data center construction and commissioning typically take?
A:Current industry timelines target 12 to 18 months from start to ready for service, driven by hyperscaler service level agreements. Commissioning is embedded in that timeline and can span the final several months. Global Arbitration Review
Q:Are the ASHRAE thermal guidelines legally enforceable in a construction contract?
A:They become enforceable when the contract incorporates them by reference as a performance standard. The ASHRAE TC 9.9 guidelines themselves are not statutes, but a contract can define compliance with a specific ASHRAE class as a performance guarantee, and a shortfall can trigger liquidated damages or other remedies. Data center SLA remedies analysis, ASHRAE TC 9.9 contractual role
Q:What happens if an owner’s lease with a tenant imposes stricter requirements than the construction contract?
A:The owner bears the gap. Construction contracts cap liquidated damages at a fraction of the contract price, while lease penalties to a hyperscaler can be far larger. The owner cannot pass those extra costs through to the contractor unless the contractor specifically agreed to backstop the lease terms. This misalignment is a core risk in AI data center development. Masin YouTube
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Junde Liu, JD, LL.M. (Taxation) candidate at UF Law. Originally published on Compute Law Blog. This article is general information and does not constitute legal advice. Reading it does not create an attorney client relationship. The reader should not act on the basis of any content here without first consulting a licensed attorney in the relevant state. Last reviewed for accuracy May 23, 2026.