BOCI meaning

BOCI (Balance of Conventional Island) describes, in power generation and nuclear project contracts, all components, equipment, systems and works within the conventional island scope, except the turbine generator plant. It is not defined in legislation or case law; it is an industry term typically given a contractual definition in EPC, EPCM or multi‑package agreements, with broadly consistent usage across England & Wales, Scotland, Northern Ireland and Ireland. In practice, BOCI commonly includes items such as the condenser and cooling water systems, feedwater and steam cycle auxiliaries, electrical balance of plant, control and instrumentation, conventional island civil and structural works, utilities, buildings and related site infrastructure—excluding the turbine generator set and its dedicated auxiliaries. The term matters for scope delineation, pricing, programme, completion, testing and commissioning, performance guarantees and liquidated damages. It also frames interface risk where the turbine generator plant is procured under a separate package. Parties should ensure the contract clearly defines the conventional island scope, expressly carves out the turbine generator plant from BOCI, and includes interface schedules, responsibility matrices and acceptance criteria to avoid gaps or overlaps, manage change control and allocate warranty and indemnity obligations appropriately.