An O&M contract (operation and maintenance contract) is an agreement under which a contractor is engaged to operate, manage and/or maintain an asset or facility on behalf of the owner. It is widely used in infrastructure, construction, energy (including wind, solar and other renewables), transport, utilities and PPP/PFI/DBFM projects across England and Wales, Scotland, Northern Ireland and Ireland, with broadly consistent usage.“O&M contract” is a descriptive commercial term rather than one generally defined in statute or case law. The parties therefore rely heavily on detailed drafting to allocate risk, responsibility and performance standards.Key features typically include: service scope (operation, planned maintenance, reactive maintenance and lifecycle works), performance indicators and availability guarantees, health and safety and regulatory compliance, interfaces with other project documents (such as EPC or design and build contracts), liability and indemnity regimes, insurance obligations, payment mechanisms (including deductions for under‑performance), change procedures, termination rights and step‑in rights for lenders or contracting authorities.In project finance and PPP/DBFM structures, the O&M contract is a critical project document, underpinning long‑term asset performance, bankability and whole‑life cost assumptions.