The owner’s engineer does not design or build the plant. Their job is to make sure the owner gets what it needs, on time and in a form that can be operated. This guide explains what the role covers at each stage and how to scope it well.
Why a data center needs one
Power plant decisions made early, such as unit size, redundancy, fuel and voltage, shape the whole campus. A developer that has never bought a turbine plant may accept a contractor’s assumptions without knowing their consequences. An owner’s engineer tests those assumptions against the campus load, the operating model and the lender or investor requirements.
The role is also a check on scope gaps. Interfaces between the power plant, the electrical rooms and the cooling plant are where many campus projects lose time, and the owner’s engineer is well placed to track them.
Writing the owner’s requirements
The first deliverable is usually an owner’s requirements document. It sets out the load profile, availability target, redundancy philosophy, fuel supply assumptions, voltage levels, controls philosophy, emissions limits and the standards to apply. Without it, each bidder prices a different plant.
Good requirements are specific about outcomes and silent about solutions where possible. They state the availability and transient performance the campus needs and leave the contractor room to propose how to achieve it.
Supporting procurement
During tendering the owner’s engineer helps prepare the technical part of the bid documents, answers technical clarifications and evaluates offers. That evaluation should compare guaranteed performance, degradation, auxiliary consumption, maintenance intervals and the strength of the test regime, not only the headline output.
Where the owner is choosing between full EPC, EPCM or separate equipment and installation packages, the owner’s engineer can explain the risk in each. Our article on EPC and EPCM for data center power sets out those differences in more detail.
Reviewing design
Once a contractor is appointed, the owner’s engineer reviews key design documents: single-line diagrams, protection studies, plant layout, fuel gas system design, control narratives and load step studies. The aim is not to redesign but to confirm the design meets the requirements and will work with the rest of the campus.
Design review is most valuable at defined gates. Agree which documents need owner comment, how long reviews take and how comments are closed, so the review process supports the schedule rather than slowing it.
Factory and site supervision
Factory acceptance tests for turbines, generators, switchgear and controls are where defects are cheapest to fix. The owner’s engineer witnesses or reviews those tests. On site, they monitor progress, quality and safety, check that inspection and test plans are followed and report to the owner on schedule risk.
The campus team gains a single, independent view of how the plant is progressing. Our page on inspection and test plans for campus builds explains what a good plan should contain.
Testing, commissioning and performance
Commissioning a data center power plant includes cold and hot commissioning of each unit, protection tests, black start and island mode tests where relevant, load step tests and a reliability run. The owner’s engineer reviews test procedures in advance, witnesses the important tests and confirms whether guaranteed performance has been demonstrated.
Results feed directly into contract decisions such as taking over, liquidated damages and release of retention. Clear test procedures agreed before testing starts avoid disputes at this stage.
Handover and operations readiness
A plant is not ready for operation just because it has passed its tests. The owner’s engineer checks that operating procedures, maintenance plans, spare parts, training and as-built documents are delivered and usable. They also check that the operating team, whether in house or contracted, is ready to take responsibility.
This is where many builds slip. Our article on the data center power critical path shows why handover activities should be planned from the start.
Working alongside lenders and the operator
On financed campuses, the owner’s engineer often works next to an independent engineer appointed by the lenders. The two roles review similar documents but answer to different parties, so agree early how information is shared and how comments are coordinated. The future plant operator should also be involved during design review, because operators notice access, maintenance and control issues that designers can miss. Bringing these voices together before construction avoids changes after equipment is installed.
Scoping the role well
An owner’s engineer contract should state clearly which stages are covered, which tests must be witnessed, how many site visits or resident staff are included and how the engineer reports. Avoid making the owner’s engineer responsible for design outcomes they do not control, and avoid overlap with the contractor’s own quality team.
Independence matters. The owner’s engineer should have no commercial interest in the plant contractor’s equipment choices, so that their advice is aligned only with the owner.
About the authors
Data center power plants are planned and delivered by our campus power team, which has worked on both sides of the owner and contractor line. USP&E delivers EPC and O&M scopes directly and does not broker work, supported by 150+ power projects in 45+ countries, 25,000 MW contracted since 2002 and 24+ years in power generation. Our data centre power page explains how we approach these projects.
Offices: Colorado Springs (1755 Telstar Dr, Suite 300), Knoxville (800 S Gay St, Suite 700), London (162-168 Regent Street), Johannesburg (22 Kildoon Rd, Bryanston), Cape Town (31 Brickfield Road, Woodstock) and China (No. 1 Ningzhou Road, Wuxi). Regions: USA | AFRICA | UK | UAE | CHINA. ISO 9001 and ISO 45001 certified.
Owner’s engineer questions
What does an owner’s engineer do on a data center power project?
They write or check the owner’s requirements, support procurement, review design, supervise factory and site work, witness testing and confirm the plant is ready for operation. They do not design or build the plant.
Is an owner’s engineer the same as a lender’s engineer?
No. The owner’s engineer works for the owner. A lender’s or independent engineer works for the financiers, although both may review similar documents.
When should an owner’s engineer be appointed?
Ideally before procurement starts, so they can help write the owner’s requirements and evaluate bids.
Does an EPC contract remove the need for an owner’s engineer?
No. Even under full EPC, the owner needs someone to check that the design and tests meet its requirements and that handover documents are complete.
Discuss your campus power plant
Send your campus load profile and schedule, and our team can explain how the power plant could be delivered and what the owner should control.
Our engineers take enquiries by telephone on +27 10 822 2324, by email at info@uspeglobal.com and through the data center enquiry page. Turbines that could suit a campus are listed in our gas turbine inventory.