Glossary E - N
Glossary O - Z

ACMMO	The Association of Coal Mine methane Operators
AD	Anaerobic digestion; the production of methane rich biogas from the process of decomposition in the absence of oxygen
ADL1; ADL2	Building Regulations Approved Documents L1 and L2 on conservation of fuel and power in dwellings (ADL1) and other buildings (ADL2)
AEP	Association of Electricity Producers; trade association representing generators
Availability	The percentage of the time that electricity generating plant is available to produce electricity (also see capacity factor)
BETTA	The British Electricity Transmission and Trading Arrangements; due to be introduced in 2005, extending NETA to Scotland
Biogas	Methane-rich gas produced by anaerobic digestion of biodegradable material, e.g. landfill gas and sewage gas
Biomass	Renewable fuels derived from purpose grown energy crops and the biodegradable proportion of industrial, municipal, agricultural and forestry residues
BiPV	Building-integrated photovoltaics
BHA	The British Hydropower Association; trade association representing the hydroelectric power industry
BRE	The (now privatised) Building Research Establishment
BSC	The Balancing & Settlement Code; The governance of electricity dispatch and settlement in England & Wales (and Scotland following the introduction of BETTA)
BSUoS	Balancing Services Use of System Charges; the means by which the TSO can recover the costs of balancing the system
Buy-out fund (of the RO)	The fund derived from suppliers who �buy-out� from their obligation to submit ROCs in respect of a proportion of their electricity sales
Buy-out fund recycling	The redistribution of the buy-out fund back to the electricity suppliers in relation to their proportion of the total ROCs redeemed in that year
BWEA	The British Wind Energy Association; trade association representing the wind energy industry
Capacity	See Rated capacity and DNC
Capacity factor	The ratio of the electrical energy produced by a generating unit relative to the electrical energy that could have been produced at continuous full-power operation during the same period
Carbon Trust	A Government-funded organisation to promote carbon reduction in business and the public sector
CBM	Coal Bed Methane; gas actively extracted from coal seams
CCA	Climate Change Agreement; consumer contract to mitigate climate change impacts linked to concessions under the Climate Change Levy
CCL	The Climate Change Levy
CDM	Clean Development Mechanism; means whereby Parties not included in Annex I in of the Kyoto Protocol can achieve sustainable development and to assist Parties included in Annex I in achieving compliance
CH4	Methane
CHP	Combined Heat & Power; the use of both heat and electrical power from a thermal power station
CHPA	The Combined Heat and Power Association; trade association representing CHP operators and developers
CMM	Coal Mine Methane; the gas continuously emitted by coal mines especially non-working mines
CO2	Carbon dioxide
Co-firing	The burning of mixed fuels (typically refers to biomass with fossil fuel in a coal-fired power station)
CUSC	Connection & Use of System Code; Governance arrangements for connection to the transmission system
CVA Metering	Metering that is registered in the Central Volume Allocation system (typically larger generation and consumers at the �wholesale� level). See also SVA metering
DC	Data collector; agent responsible for obtaining metering data on behalf of the electricity supplier and preparing it for electricity settlement
DEFRA	The Department for Environment, Food and Rural Affairs of the UK Government
DETI	The Department of Enterprise Trade and Investment of the UK Government in Northern Ireland; equivalent of DTI
DGCG	The Distributed Generation Co-ordination Group; body advising Ofgem and the DTI on the effects of distributed generation on the UK electricity network
Disclosure	The requirement (under the IEMD) on electricity suppliers to provide details to consumers of the fuel sources of the electricity they have purchased
Distributed generation	Power generation embedded in (connected to) an electricity distribution network (as compared to centralised generation connected to the transmission network)
Distribution Code	The code of practice, which covers all major technical aspects relating to connections to, and the operation and use of, licensed distribution networks
Distribution network	The network for electricity distribution at voltages below that of the transmission network
DNC	Declared Net Capacity; a correction factor applied to the rated capacity of some intermittent generation sources to enable like-for-like comparisons with typical thermal plant capacity
DNOs	Distribution Network Operators
DTI	The Department of Trade and Industry of the UK Government
DUKES	The Digest of UK Energy Statistics