- Build execution
- The physical delivery of a data center — getting it constructed, powered, and commissioned on the promised date. In a supply-constrained market it has become the primary competitive differentiator, because scarce, hard-to-replicate execution capability, rather than widely shared design quality, decides who wins contracts.
- Commissioning
- The rigorous testing phase in which installed systems are energized, run, and deliberately failed to confirm that backups engage, verifying the whole facility behaves as designed before a customer's live load depends on it. It takes real time, often surfaces problems, and cannot be safely rushed.
- Critical path
- The longest chain of dependent tasks in a project — each unable to start until the previous finishes — which sets the project's minimum possible duration. Shortening a task off the critical path does not speed the project; only shortening the critical path itself does, and doing so can shift the bottleneck elsewhere.
- EPC firm
- An engineering, procurement, and construction firm that takes responsibility for designing, buying the equipment for, and building a facility under a single accountable organization. The model internalizes the seams between phases where delays and finger-pointing usually occur, which is valuable for schedule-driven projects.
- General contractor
- The firm responsible for physically building a facility — organizing and sequencing the work and coordinating the many specialized trade subcontractors. It functions like a conductor of an orchestra of independent trade companies who must perform in the right order and in time with one another.
- Long-lead item
- A piece of equipment whose time from order to delivery is very long — often years — because it is custom-built to order by a limited number of backlogged manufacturers. Transformers, switchgear, and generators are the key examples; their delivery dates set the floor under a project's schedule and cannot be accelerated by money alone.
- Power transformer
- A custom-engineered device that steps grid electricity down from high transmission voltage to levels a facility can distribute and use. Large facilities need several, and their multi-year lead times make them the archetypal long-lead item and often the single longest pole in a project's schedule.
- Switchgear
- The assembly of switches, breakers, and protective devices that routes power safely inside a facility while protecting it from faults such as short circuits and overloads. Like transformers, it is built to order, supply-constrained, and can sit on the critical path.