AGR (Advanced Gas-Cooled Reactor)
The second generation of gas-cooled nuclear reactor built in the UK.

Baseload Generation
Mode of operation of a power station at a constant high level of output for a sustained period of time to assist in meeting minimum national demand.

Bonds
Bonds issued by British Energy Bond Finance plc (formerly British Energy Holdings plc).

British Energy Direct
British Energy Direct Limited.

BERR
Department of Business, Enterprise and Regulatory Reform.

BETTA
British Electricity Transmission and Trading Arrangements.

BNFL
British Nuclear Fuels plc.

BNGSL
British Nuclear Group Sellafi eld Limited.

BCU (Boiler Closure Unit)
Concrete and steel structure forming part of the reactor pressure boundary unique to Hartlepool and Heysham 1.

Bruce
The Bruce A and B nuclear power stations in Ontario, Canada.

BSUoS
Balancing Services Use of System.

Clean Dark Spread
The price of electricity less the cost of coal and carbon.

Contribution Agreement
The agreement dated 14 January 2005 and now between the Secretary of State, NLF, British Energy Generation Limited, British Energy Group plc and British Energy Bond Finance plc (as amended from time to time).

Decommissioning
The process whereby a nuclear power station is shut down at the end of its economic life, eventually dismantled, and the site made available for other purposes.

DUoS
Distribution Use of System.

Emission Limit Values (ELV)
Emission limits imposed under the Large Combustion Plant Directive, requiring operators to maintain emissions within a rate limit at all points in time.

Energy Supply Costs
Mainly comprise the costs incurred for the use of the distribution and transmission systems, recovered through revenue, and costs of Renewables Obligation Certifi cates (ROCs).

Environmental Events
Environmental events are events arising from both radioactive and non-radioactive wastes or discharges above permitted levels or breaches of permitted conditions at British Energy sites, including nuclear power stations, district survey laboratories and offices.

EPL
Eggborough Power Limited.

EUETS
European Union Emissions Trading Scheme.

Forward market price
The average of the mid-point of the daily closing prices over the relevant year for forward annual baseload power (starting with the average forward price of the next six month winter and following six month summer season contracts and thereafter the average forward price of the same following six month summer season contract and subsequent six month winter contract) as reported on European Daily Electricity Markets, published by Heren Energy.

GTMA
Grid Trade Master Agreement.

GW (Gigawatt): GWh (Gigawatt-hour)
One gigawatt equals 1,000 MW: one gigawatt-hour represents one hour of electricity consumed at a constant rate of 1 GW.

Investment in Plant
Investment expenditure on plant projects, major repairs and strategic spares across the whole Group.

ISDA
International Swap Dealers Association.

kW (Kilowatt): kWh (Kilowatt-hour)
A kilowatt is a unit of power, representing the rate at which energy is used or produced: one kilowatt-hour is a unit of energy and represents one hour of electricity consumption at a constant rate of 1 kW.

Large Combustion Plant Directive (LCPD)
EC Directive applicable to combustion plants exceeding 50MW thermal, that takes into account recent advances in combustion and abatement technologies to introduce revised limits for releases of SO2, NOx and dust. Under UK implementation of theDirective, operators are permitted to elect either the Emission Limits Value (ELV) approach or the National Emissions Reduction Plan (NERP) approach.

Levy Exemption Certificates (LECs)
The climate change levy is a tax on the use of energy in industry, commerce and the public sector. The purpose of the levy is to encourage the efficient use of energy, therefore a range of measures are in place to assist energy users to improve energy efficiency, one of which is the exemption for the use of renewable power. LECs are provided as proof that this exemption is valid. 1 LEC equals 1MWh of renewable energy.

LLW, ILW, HLW (Low, Intermediate, High Level Waste)
Radioactive waste is classified as low, intermediate or high level waste according to its heat generating capacity and radioactivity. LLW comprises slightly radioactive materials, such as discarded protective clothing and used wrapped materials. ILW comprises more radioactive materials, including sludges and resins from the cleaning of fuel storage pond water, fuel cladding and other materials arising from the reprocessing of spent fuel, and some radioactive components arising from the decommissioning of plant. HLW comprises nuclear waste products separated out from uranium and plutonium during the reprocessing of spent nuclear fuel.

Load Factor
The electricity produced by a power station expressed as a percentage of the electricity it could have produced if operating at its reference energy generation over a fixed time period, usually one year.

Lost Time Accident (LTA)
An incident which causes one or more days off work (consecutive or not) after, but not including, the day of an occupational injury or illness.