HYB meaning

HYB is the industry shorthand for Heysham B (Heysham 2), an Advanced Gas-cooled Reactor (AGR) nuclear power station at Heysham, Lancashire, operated by EDF Energy Nuclear Generation Limited. In legal and regulatory practice it is used to identify this specific generating asset in energy contracts and market documentation, including power purchase agreements, grid connection and use-of-system agreements, Balancing and Settlement Code (BSC) trading records, National Grid ESO outage notices, REMIT disclosures and Capacity Market materials. HYB is not defined in legislation or case law; it is a descriptive identifier widely adopted across the UK electricity market. Practitioners should distinguish HYB (Heysham 2) from Heysham 1, often abbreviated “HYA”. The abbreviation is significant for precise asset referencing in drafting and due diligence, allocation of metering and settlement data, capacity and compliance obligations, security and charging arrangements, and change-of-control or assignment provisions. Usage is broadly consistent across England & Wales, Scotland, Northern Ireland and Ireland, and may appear in cross‑border trading and interconnector documentation when referring to this English nuclear station. As at the date of writing, Heysham 2 remains operational, with life currently expected to extend to around 2028 (subject to regulatory approvals and operator decisions).