|Fate||Amalgamated into British Energy|
|Headquarters||London, United Kingdom|
Before 1990, the generation and transmission activities in England and Wales were under the responsibility of Central Electricity Generating Board (CEGB). The present electricity market in the UK was built upon the break-up of the CEGB into four separate companies in the 1990s. Its generation (or upstream) activities were transferred to three generating companies – 'PowerGen', 'National Power', and 'Nuclear Electric' (later 'British Energy', eventually 'EDF Energy'); and its transmission (or downstream) activities to – the National Grid Company.
When the CEGB split up was announced, its power stations were decided to be divided between PowerGen and National Power. The nuclear stations, Magnox, AGR and the then under construction Sizewell B (PWR), were allocated to National Power in their nuclear division. However, the privatisation process in National Power was delayed as it was concluded that the 'earlier decided nuclear power plant assets in National Power' would not be included in the private company – 'National Power'
In 1995, the assets of Nuclear Electric and Scottish Nuclear were combined as well as split. The combination process merged operations of UK's eight most advanced nuclear plants – seven Advanced Gas Cooled Reactor (AGR) and one Pressurised Water Reactor (PWR) – into a new private company founded in 1996, 'British Energy'.
The splitting process created a separate company in 1996 called 'Magnox Electric' – which would hold a proportion of the old CEGB's nuclear stations, its older Magnox reactors. The assets of Magnox Electric were later combined with BNFL in 1998, and eventually operated and managed by US based EnergySolutions through its June 2007 acquisition of the BNFL subsidiary – Reactor Sites Management Company.