- BaseloadThe load continuously supplied by generators into the electricity networks over a period of time that demand does not fall below.
- CapacitySupply Capacity (or Availability) is a limit on monthly maximum demand agreed between the user and the regional distributor (normally via the supplier). Measured in kVA.
- Carbon reduction CommitmentAn intensive energy users requirement to reduce carbon emissions measured in Tonnes.
- Climate Change AgreementClimate change Agreement - a Gov't scheme in giving discounts to large energy users against their carbon emmisssion costs - CCL
- Climate Change LevyA customs and excise levy charged to most commercial users of electricity since 2001. The levy is applied at a fixed rate per kilowatt hour.
- Combined Heat and PowerA power generation plant which produces electricity and uses the waste heat generated to warm a building or buildings. This may be small scale inside a factory or large scale where heat from a power station is used to provide heating for a local district containing domestic, commercial and(...)
- Communication ChargesCommunication charges cover the cost of the telephone line or cellular link used for remote access to the electricity meter. This applies to half-hourly metered sites only. Communication charges can be billed to the customer by either the meter operator or the supplier.
- Correction FactorUsed by suppliers to calculate gas bills. The correction factor and the calorific value are the two variables used in the process of converting gas volume (as measured by the meter in cubic feet or cubic metres) into a measure of energy in kilowatt hours (kWh). Charges are based on kilowatt hours.
- Cubic FeetUnit of measure for volume of gas recorded by imperial meters.
- Cubic MetresUnit of measure for volume of gas recorded by metric meters. One cubic metre = 35.31 cubic feet.
- CurtilageThe area of land within a boundary surrounding a property when not crossed by public highways, rail lines etc. Gas meter points sharing common ownership, purpose and curtilage may be aggregated to reduce transportation charges.
- Daily meteredA gas supply point whose consumption is measured each day by means of a data logger.
- Data aggregatorThe organisation appointed to aggregate electricity meter reading data received from data collectors to forward to suppliers.
- Data collectorThe organisation responsible for collecting, processing and validating the meter reading data which is then passed on to the data aggregator.
- DataloggerDevice fitted to a meter that can record, store and transmit readings and measurements.
- De MinimisIf the amount of electricity supplied to a commercial site is less than 33 kWh per day and gas supplied less than 145 kWh per day respectively over a billing period then de minimis applies and VAT is charged at the reduced rate (currently 5%).
- DemandThe rate at which electric energy is used in any instant or average over a period of time. Usually expressed in kilowatts (kW) or kilovolt-amperes (kVA). See also Maximum Demand.
- Demand levelThe consumption of electricity in half-hourly intervals actually used on a national basis.
- Demand-side ResponseWhen large gas users turn down their gas usage in response to prices. See also interruptible supply. Distribution Network Operators (DNOs) DNOs are ex-Public Electricity Suppliers that came into existence on 1 October 2001. There are currently 14 Distribution Network Operators (DNOs) in the UK.
- Distribution lossesCharges relating to electrical losses that occur as electricity is transmitted through the lines of the DNO (see below).
- Distribution network operatorManages the installation and upkeep of their cabling and the distribution of electricity from the point where it leaves the transmission system to the supply point. They are also often referred to as the host Regional Electricity Company (REC).
- Distribution use of systemCharge levied by the DNO for the transmission of electricity through its local network.
- Entry capacityThe quantity of gas that a shipper is entitled to put into the system at a particular input point on a day.
- Exit capacityThe quantity of gas that a shipper is entitled to withdraw from the national transmission system in order to meet the requirement of its customers on a day.
- Exit zoneA geographical gas distribution area wholly contained within a local distribution zone which groups supply points together that, on a peak day, receive gas from the same national transmission system offtake point(s). Supply points in the same exit zone attract the same exit capacity charge rate.
- Firm gasA guaranteed supply of natural gas that will not be subject to interruption.
- Firm SupplyA firm supply of gas is one that is guaranteed for a fixed period and will not be subject to an interruption or closure.
- Forwards contractAn agreement to buy electricity from another party at a specified time in the future at a specified price with money changing hands at the delivery date.
- Fossil fuelCoal, natural gas and fuels derived from petroleum.
- FundamentalsFactors other than psychological or technical that influence the price development on the physical or futures market, e.g. physical supply and demand, stock levels, currency exchange rates, interest rates, weather forecasts etc.
- Futures contractSimilar to a forwards contract these are normally traded through an exchange on standard contract terms with profits or losses calculated and paid daily.
- Gas yearPeriod commencing 06:00 1 October through to 06:00 1 October the following year.
- Gate closureIn relation to a settlement period, the time 3.5 hours before the start of that settlement period. It defines the moment when bilateral contracting ends and the Balancing Mechanism for each associated trading period begins.
- GeneratorProducer of electricity.
- GigawatthourThe equivalent to one thousand megawatts or one million kilowatts (kW).
- Grid supply pointPoint between transmission and distribution systems where responsibility for electricity supply transfers from National Grid Transco to the local REC.
- Half hourly dataHalf-Hourly data. Electricity consumption data recorded every half hour and collected by the metering system.
- Half hourly meteredDescribes measurement of electricity consumption in half hourly intervals through a meter complying with the relevant Code of Practice (COP). COP3 for 1MW+ sites or COP5 for sites with demand over 100kW and up to 1MW.
- High VoltageHigh Voltage. Supply voltage above 1000 volts (1kV).
- HMC&EHM Customs & Excise.
- I&CIndustrial and Commercial (non-domestic sector).
- ImbalanceSituation where there is a difference between the amount of power produced (supply) and the amount of power contracted or sold (demand).
- Line packMethod used for providing short-term gas storage in which natural gas is compressed in transmission pipelines, providing additional amounts of gas to meet limited peak demands.
- Liquified natural gasOilfield or naturally occurring gas, chiefly methane, liquefied for transport or storage.
- Load FactorRatio of average energy demand (load) to maximum demand (peak load) during a specific period. Usually stated as a percentage, or number of hours used.
- Local distribution zone (gas)A geographic area for which the total input and output demand for gas can be measured each day. LDZs are supplied by groups of offtakes from the national transmission system.
- Local DistributorOne of 14 local distribution companies responsible for maintenance of the local distribution zone.
- Low VoltageLow Voltage. Electricity supply voltage below 1,000 volts.
- Maximum annual quantityAnnual quantity of gas multiplied by the MAQ percentage.
- Maximum daily quantityMaximum aggregated daily quantity of gas to be delivered to a supply point.
- Maximum demandThe highest average electricity demand occurring in a half hour period. Maximum demand tariffs comprise of a) fixed monthly charge, b) an availability charge per kVA of the highest demand expected, c) a price per unit for day and night units, d) a maximum demand charge based on the measured(...)
- MegawattThe equivalent to one thousand kilowatts.
- Meter operatorThe organisation appointed to install and maintain metering equipment.
- Meter operator agreementAgreement between the customer and the nominated meter operator.
- Meter Point Administration NumberUnique 21 digit number assigned to electricity meter(s) by MPAS under PRS (two tier number printed on electricity invoices preceded by an S. Top line referred to as Supplementary, bottom line as Core). Also known as Supply Number.
- Meter Point Administration ServiceMeter Point Administration Service. Provides information regarding electricity supply to properties in their distribution network areas and regulates the registration process between electricity suppliers.
- Meter point reference numberGas meter reference number.
- National Grid TranscoOperates the high voltage national electricity transmission network and the gas transportation networks in England and Wales.
- National offtakeA gas metering point defining the boundary between the national transmission system and the Local Distribution Zone.
- National transmission systemThe high-pressure network of pipes that transports gas between terminals, storage facilities and Local Distribution Zones for local distribution.
- NetworkA distribution system in which the secondaries of the distribution transformers are connected to common conductors for supplying power directly to a customer's service.
- Network CodeA document that lays out the rights and responsibilities of all those using a Public Gas Transporter (PGT) network. The Network Code is normally used to refer specifically to the PGT network.
- Nominated ConsumptionThe expected consumption of gas over a twelve month period used in a supply agreement.
- Nominated interruptionThe designation by National Grid Transco of a gas supply point as being interruptible, allowing Transco the right to interrupt the gas supply for operational reasons.
- Non-daily meteredGas supply point whose meter is not fitted with a data logger and is read monthly, six monthly or at longer intervals.
- NTS (National Transmission System)The pipeline network and supporting facilities that are used to transport gas around the UK.
- ObjectionA notice issued to a shipper who received an involuntary withdrawal indicating that they wish to retain responsibility for the supply point. Offtake Gas consumed by a site or customer.
- Offtake pointOutlet of any control valve at any gas supply meter point.
- OfgemThe Office of Gas and Electricity Markets. The industry regulator.
- Percentage DayThis refers to the percentage ratio of electricity used in the daytime against that used in the night. This information is used by suppliers to quickly identify the type of profile.
- Power FactorThe ratio of active or real power in kilowatts (kW), to apparent power in kilovolt amperes or kVA. Power Factor is normally expressed as a figure between zero and one. Unity power factor is 100% (or 1.0) power factor which is the highest available. In practice 0.99 is the highest.
- ProducerA company that explores for gas, drills the wells and extracts gas from the seabed.
- Public Gas TransporterA pipeline network operator, the largest of which used to be Transco, but is now National Grid.
- Public gas transportersLicensed gas pipeline operators.
- Public registration systemSystem for registering electricity supplies using Supply Numbers and MPANs.
- Reactive power chargeCharge for reactive energy if the average power factor falls below a preset level, normally 0.9.
- Renewable energyGeneration of electricity from infinite resources, e.g. wind power or hydro-electricity.
- Renewable obligation certificatesTradable certificates issued by generators for each whole megawatt-hour of electricity generated from eligible renewable sources. ROCs can be converted into emissions allowances in the UK Greenhouse Gas Emissions Trading Scheme.
- Renewable sources of energyEnergy sources that occur naturally and repeatedly in the environment, eg from the sun, the wind and the oceans, and from plants and the fall of water. It also refers to the energy available from wastes and to the emerging clean technology of fuel cells.
- Renewables obligationAn obligation on electricity suppliers to source a specified percentage of the total electricity supplied to their customers in Great Britain is from eligible renewable sources. This must be evidenced by Renewable Obligation Certificates.
- Settlement chargeA flat fee to cover the collection of electricity data by the data collector.
- Settlement periodA half-hour period ending on the hour or half-hour.
- Settlements AgencyThis is the body that "settles" the distribution of electricity to establish where and to whom the generated load has been distributed to.
- Settlements chargesA charge applicable to half-hourly metered supplies. Effectively a standing charge that covers balancing and settlement.
- Site nominationProcess by which a shipper informs National Grid Transco it wishes to supply gas to a new customer supply point.
- Smart metersAny meter which allows for the identification of consumption in more detail than a conventional meter. Smart meters will generally also include a means of communicating information to a central data collection site for energy management and/or billing purposes.
- Spill SurplusElectricity that a generator has produced but is not able to sell.
- Standing chargeA charge designed to average over and recover from all customers on each tariff the elements of cost which are independent of consumption. Includes the costs associated with metering, billing and customer services.
- Supply PointA group of one or more meters for which the PGT shall make natural gas available for offset by the Shipper.
- System Buy PriceThe price paid in the Balancing Mechanism by a party that requires more energy to meet its contractual commitments. Prices are often volatile and very high.
- System Sell PriceThe price paid in the Balancing Mechanism by a party that has produced more electricity than it had users to buy. Prices are very volatile and often negative, meaning that a payment would need to be made to dispose of the unwanted electricity produced.
- Take or payA contract whereby a customer must pay for a specific minimum quantity of gas irrespective of usage.
- TechnicalsFactors other than fundamental or psychological ones that influence future price developments e.g. trend indicators, moving averages, support and resistance levels etc.
- Third party accessRight of any gas or electricity supplier to have access to the national transmission system of that energy even though the system is operated and/or owned by another organisation.
- TransformerAn electric device, without moving parts, for transferring electric energy from one or more circuits to one or more other circuits by electromagnetic induction.
- TransportationMovement of gas from the beachhead terminal to Local Distribution Zones.
- Transportation chargeThe charges associated with transporting gas from the beach to Local Distribution Zones. Prices are based on a distance related tariff system and vary depending on interruptible and firm supply.
- UKDCSUK Data Collection Service. Former name of IM-Serv.
- XoserveThe company that maintains the gas sites and meters database and holds the key supply point data used throughout the industry.