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Operation and Maintenance Costs meaning

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What does Operation and Maintenance Costs mean?
In legal and commercial practice, Operation and Maintenance costs (O&M) are the day‑to‑day costs of operating and maintaining a nuclear power station, excluding the cost of nuclear fuel and any capital expenditure. The term is not generally fixed by legislation or case law in the UK or Ireland; its scope is usually defined in contracts (for example, power purchase agreements, O&M agreements, project finance documents) or by regulatory determinations. Typical inclusions are staff and contractor costs, routine and corrective maintenance, consumables and spare parts, insurance, security, site services and utilities, business rates, regulatory compliance and licensing fees, monitoring and testing, outage planning and execution, ICT and administrative overheads, and on‑site management of operational radioactive waste (but not long‑term spent fuel disposition). Typical exclusions are fuel procurement and fabrication, capital costs (such as plant upgrades, life‑extension projects and major refurbishments classified as capex), financing costs, and decommissioning or long‑term back‑end fuel cycle liabilities where treated separately. Usage and scope are broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, but the governing definition will be the one in the relevant contract or regulatory framework, including for tariff setting, pass‑throughs, benchmarking, budgets and termination or compensation calculations.
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