| 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 |
