Data centre commissioning and testing providers
Levels 1 to 5, integrated systems testing, load bank runs, witness testing and handover.
North America
View region →2N Mission Critical is an Atlanta based commissioning firm working on hyperscale data centres and other mission critical infrastructure. It documents a Level 0 to Level 5 commissioning process running from commissioning plan development and design review through pre-functional checks, functional performance testing and integrated systems testing at full load, ending with training and turnover to operations staff. It also offers QA and QC, owner's representative, thermal imaging and coordination study services for the same facility types.
Adaptive Commissioning Solutions is an independent third-party commissioning firm with an office in Richardson, Texas, inside the Dallas metro. It names mission critical data centres among its areas of expertise, alongside healthcare, academic research buildings and laboratories. Its published process covers owner's project requirements and basis of design review, commissioning plan and specifications, pre-functional checklists, functional performance tests, owner training and a final report, and it is an AABC Commissioning Group member firm.
Command Commissioning is a third-party independent technical commissioning provider that has worked on facilities from small equipment replacements up to buildings over two million square feet, including data centres and central utility plants. Its stated mission-critical experience covers commissioning of complex HVAC at the functional and integrated systems level, and commissioning of building automation, security, fire alarm and intelligent building controls. Its Dallas and Fort Worth office is in Irving, Texas, alongside offices in Austin and The Woodlands.
Electrical Testing Solutions is a NETA oriented electrical testing and commissioning provider based at Oshkosh in Wisconsin, with a stated service area covering data centres across Illinois including the Chicago area. For data centre clients it performs commissioning and pre-commissioning on new and expanding installations, load bank testing, high voltage and switchgear testing, and compliance evaluation. Its scope is electrical systems rather than full multi-discipline Level 1 to Level 5 commissioning authority work.
Engineering Economics, Inc. is an independent building commissioning firm whose mission-critical practice commissions data centres through a levelled process running from design review at Level 0 to transition to the facilities team at Level 6. Named steps include factory test scripts, witnessing equipment startups, functional performance tests, integrated systems test scripts and testing of redundancy and failover under simulated failure scenarios. It holds an office in Phoenix, Arizona.
GAI Consultants runs a data centre and mission-critical facility commissioning programme organised into levels that parallel the project delivery lifecycle, from design through operations handover. Its published scope covers factory witness testing at the supplier's plant, load bank testing of generators and UPS at rated load, and integrated systems testing that simulates utility loss, generator failure, UPS failure and chiller failure. It serves the Phoenix market from an office in Tempe, Arizona.
Hood Patterson and Dewar is an electrical and mechanical testing, commissioning and engineering firm that acts as third-party commissioning agent on data centres, power plants and other mission-critical facilities. Its published commissioning scope runs from design, drawing and specification review through commissioning script development, factory witness testing, energised functional testing of individual components and integrated systems functional coordination, outage behaviour and capacity verification. It covers the Dallas and Fort Worth market from an office in Addison, Texas.
Newcomb and Boyd is an engineering and consulting practice headquartered in Atlanta, with further offices in Charleston, Jacksonville and Raleigh-Durham. Its data centre group provides Level 1 to Level 5 commissioning and quality assurance support, including factory witness testing, static inspection, pre-functional witnessing, functional testing and integrated systems testing. The firm states its data centre work dates from 2013 and covers 12 project sites.
TMCx Solutions is a professional engineering firm specialising in independent third-party commissioning, with an office at Mesa, Arizona. It provided Level 5 integrated systems commissioning on the SRP-MIC IT data centre in Scottsdale, covering mechanical HVAC, electrical and fire protection systems, and enhanced commissioning on the Gila River Indian Community data centre in Phoenix. Its portfolio also lists critical facilities work for other data centre owners.
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Commissioning and testing providers
Each entry records what a provider states about its own scope: the levels it covers, the systems it tests and where its engineers are based. Details come from the provider's own material and public sources. Check the named engineers and the reporting line yourself before you appoint.
This is an independent listing compiled from public information. Listings are not endorsements, and Fernable has no commercial affiliation with the companies listed.
Common questions
What do commissioning Levels 1 to 5 mean in practice?
Broadly: factory witness testing, delivery and installation inspection, pre-functional checks and first start, functional performance testing of each system alone, then the integrated systems test. The numbering is only a convention, so treat the levels and responsibility matrix in your commissioning plan as the definition.
Do I need an independent provider if the contractor is commissioning anyway?
The contractor's start-up proves the installation works as installed, not that it meets the design intent, and the party holding the payment milestone should not judge the pass. An independent appointment reporting to the owner is how findings get recorded rather than reclassified.
What is the integrated systems test supposed to prove?
That the building survives the failures it was designed to survive, under load and at temperature: utility loss, a generator failing to start, a cooling pump dropping out, a control power supply failure, one path out for maintenance while the other carries everything. If nothing surprises you, check the scenarios were real.
Can load bank testing stand in for real IT load?
Only partly. Banks reproduce kilowatts, not the harmonic content, crest factor, power factor or second by second variation of switch-mode supplies, and they sit where a bank fits rather than in the racks. They prove the power and cooling plant, not airflow or containment.
When should the commissioning provider be appointed?
Before the design is frozen, if you can. An early appointment lets someone say what cannot be tested as drawn, gets witness scripts agreed before factory dates are booked, and puts a fixed commissioning window in the contract programme.
What do I do when the programme slips and commissioning gets squeezed?
Protect the integrated test window and give up something else. Cut scope in the open, with deferred scenarios written into a register that the person signing the handover and the person operating the building both read.
What this category covers
The firms here commission data centres: writing the commissioning plan, holding the script library, witnessing factory tests, sitting over the installing contractor's start-up and running the integrated systems test at the end. Some are commissioning authorities proper: appointed by the owner, reporting to the owner, with no contractual interest in the installation passing. Others are specialist testing firms doing the measurement work: primary and secondary injection, protection setting checks, battery discharge, thermography, airflow and containment measurement, load bank operation. One appointment often covers both roles, so ask which you are buying: a manager who subcontracts every instrument carries different programme risk from a firm with its own field engineers.
What sits outside is worth naming. The mechanical and electrical contractor's own start-up is not commissioning, it is part of installing the plant. The manufacturer's factory start-up of a UPS, chiller or generator set is a warranty activity the vendor will insist on doing with its own engineer. Design review is a design activity, though your provider should read the drawings early and say what cannot be tested as drawn. Where the same firm writes the commissioning specification and then tests against it, note the position: it is still better than the contractor setting its own pass criteria.
What you are actually hiring for
Most appointments fall into a few shapes. An owner appoints an independent commissioning authority for a new build, covering base plant and then each fit-out phase. A colocation operator needs a per-hall integrated systems test before a customer will accept a suite, and needs it again when the next hall energises. A tenant hires a witness engineer to sit on someone else's test and protect its own acceptance date, sometimes alongside due diligence on a building already in service.
The other half of the market is existing buildings. Capacity uplift brings retests: a module added to a running UPS frame, another chiller, a busway extension, a battery replacement needing a discharge test and a recharge window. After an incident you retest the scenario that failed and everything the fix touched. Operators with more than one site buy a standard specification and script library so results compare across buildings. Then there is periodic work: the annual black building test, generator load bank runs, battery capacity checks.
Levels 1 to 5, and who is in the room
Level 1 is factory witness testing: your engineer stands in the works while the UPS, the switchboard or the generator set runs against an agreed script, before it ships. Level 2 is delivery and installation inspection, checking what arrived against the drawings, the manufacturer's stated requirements and the damage that happened in transit. Level 3 is pre-functional: point to point checks, instrument calibration, energising, first start of each item alone. Level 4 is functional performance testing, each system running its full sequence in isolation: a generator accepting load, a UPS transferring and dropping a module, every alarm proving out at the head end. Level 5 is the integrated systems test.
Treat the numbering as a convention, not a standard: specifications renumber these levels, so insist on a levels and responsibility matrix naming every system, the level it reaches, who executes, who witnesses and who signs. The integrated systems test is the one level that is not a demonstration. It exists to break the building on purpose while you watch: lose the utility with the plant hot and at load, drop a generator during the start sequence, fail a control power supply, take one side of a dual path out of service and prove the other carries everything. Load bank testing is what lets you do this before a single server arrives. Witness testing is a discipline rather than a stage: a test with the installing contractor alone in the room is a start-up with a signature on it. Handover is when the paperwork and the open items change hands.
How this work gets priced
There is no rate card, and you should be wary of one. Commissioning is tendered against a defined scope: which levels apply, the asset schedule (UPS modules and frames, generator sets, chillers and pumps, switchboards, transfer switches, branch circuits, monitoring points), the script count, the site and witness days, the number of integrated test scenarios and the reporting platform. The output is usually a lump sum for those deliverables plus stated day rates for extra attendance. Two buildings of the same floor area price differently because the asset count, the hall count and the programme differ.
Read what a lump sum excludes, because the gaps are predictable. Load bank hire, temporary cables and distribution, craneage, the power and fuel burned during testing, bunkering and fuel polishing, battery recharge time between discharge tests and the vendor attendance the warranty demands are often someone else's line. Settle in the contract who pays for a retest when a script fails, and whether abortive factory trips and standby are recoverable. What drives the number up: phased halls, each a fresh integrated test; night and weekend work to suit a live campus; an occupied building with permits and isolation risk; a tenant standard prescribing scripts you cannot reuse. Programme slip drives it hardest: a lump sum priced against a programme becomes variations the moment the programme moves.
The documents that decide the argument
Commissioning is a documentary activity as much as a technical one, and the argument at the end is about what was agreed at the start. Get the owner's project requirements and the basis of design written down, because every script should trace back to a claim in one. Then the commissioning plan, the levels and responsibility matrix, pre-functional checklists, scripts signed by the named witness, an issues log with severity, owner and closure date, and the sequence of operations as a document rather than logic in a controls engineer's laptop. Add the coordination study with as-left relay settings, instrument calibration certificates and the load bank calibration record.
At handover, read the deferred test register before the report. It is the honest summary of what was not proven, and it is the list your operations team inherits. The rest of the pack: the commissioning report, red line and as-built drawings, operating and maintenance manuals, the fire cause and effect record with every interface to the electrical and cooling plant, training attendance by name, spares and keys. Insurers and lenders often want the report before cover or drawdown, and a colocation customer will run its own witness test on its suite and compare the results.
Where this goes wrong
Here is the failure that recurs on every slipped job. Commissioning sits at the end of the programme, so every delay upstream lands on it, and the activity designed to find faults is the one with no time left to find them. The provider arrives to a building not ready for Level 3, is asked to run Levels 4 and 5 in parallel with snagging, witnesses tests on temporary supplies with the graphics half built, then is asked for a certificate against a date set by a lease. Scripts get trimmed, scenarios move to the deferred register, the integrated test becomes a demonstration of the things that work. The faults are still there. Your operations team finds them at three in the morning with live load on the floor.
The second failure is believing the load bank. Resistive banks give steady kilowatts at unity power factor in coarse steps, connected at a busway or distribution board. Real load is switch-mode, drawing harmonic current with a crest factor the bank does not reproduce, often at a power factor that is not unity, and it swings in seconds rather than in planned steps. A generator sized on kilowatts can still struggle on reactive load, so specify reactive stages and test at the design power factor, not only at unity. Most of all, a bank in the hall is not load in the racks: it will not show containment leakage, the pressure profile, a hot spot behind a blanking gap or the final subcircuit you bypassed to connect it.
The third is self-certification. When the installing contractor writes the script, picks the scenarios, judges the pass and holds the payment milestone, it has every reason to call a finding an observation. Scripts drift towards testing what was installed rather than what was designed, and nobody challenges the sequence of operations, which is where the latent faults live. Commissioning is where design assumptions meet reality, and the reality is usually a single point of failure nobody drew: one control power supply feeding both sides, a shared controller, a single fuel line to two day tanks, a chilled water volume giving half the ride-through the design claimed, protection settings changed in the field and never fed back into the study.
How to choose between providers
Start with the reporting line. If the provider is a subcontractor to the party it is testing, you have bought a second opinion with a conflict in it. Then ask about the topology you actually have: dual path against N plus one, chilled water against direct expansion, evaporative assist, liquid cooling at the rack. Experience on one does not transfer cleanly to another. Ask who writes the scripts, and to see one, redacted, with a real issues log from a finished building. The log tells you more than the proposal: severity language, whether findings close with evidence, how many were still open on the day of handover.
Ask for names, not a firm. You want CVs for the engineers who will be on site, the days each is committed for, how many are staff rather than hired in, and whether the person in the pitch runs the job. Certifications work as a floor and no more: a credential earned on office buildings does not mean someone has stood in front of a black building test. Check professional indemnity cover if they will comment on design. Ask whether they have ever refused to sign off a handover, and what happened next. A folder of PDFs is not a handover, and the team running the building is the reference worth calling.
Why location still matters
This is an attendance business. Scripts are witnessed in person, instruments travel, and factory tests happen wherever the plant is built, which is rarely near the site. The pool of engineers who have run integrated tests on critical power is thin in every market, so firms fly people in and charge for it. That is often unavoidable, but mobilisation, accommodation and standby then sit on your programme. The dates are frequently set by someone else: the manufacturer's commissioning engineer for the UPS or the chiller has a calendar, and if that visit slips, every level behind it slips too.
Local conditions bite in specific ways. Inspection regimes and the authority having jurisdiction decide what has to be witnessed and by whom, and the utility will want its own witness for the connection. Planning conditions and emissions permits can limit when and how long you may run generators at full load, a programme constraint disguised as an environmental one. Permit to work rules and local licensing decide who may operate a breaker during a test. Reference standards differ by market, so a script built around one code family needs rewriting for another.