EPC (Engineering, Procurement, and Construction)
Also known as: Turnkey Contractor, Turnkey Provider
A contract form — not a technical function — under which a single entity takes full responsibility for engineering, procuring, and constructing a complete BESS plant. The EPC contractor bears commercial accountability for performance, schedule, and cost. Under an EPC contract, system integration responsibility sits with the EPC contractor by default — whether they perform it in-house or subcontract it.
In energy storage
EPC is not the only delivery model. Developers with sufficient technical capability can bypass the EPC wrapper entirely by procuring equipment directly — buying DC blocks, PCS, controls, and other components from separate suppliers. In doing so, the developer takes on system integration responsibility themselves. The technical function is the same regardless of who holds it commercially; the difference is contractual structure and risk allocation.
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