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See Estimated Annual Consumption


See Energy Contract Volume Aggregation Agent


Energy Contract Volume Notification Agent


Electronic Data Interchange Format for Administration, Commerce and Transport.


Embedded Exemptible Large Power Station


Embedded Exemptible Medium Power Station


Embedded Exemptible Small Power Station


European Energy Exchange. An energy exchange based in Leipzig, Germany. EEX operates Spot and Derivatives Markets for energy and related products.


Electricity Forward Agreement

EFA Blocks

Six four hourly blocks within the EFA day (being 23.00 hours to 23.00 hours in the immediately following day).

EFA Month

The EFA (Electricity Forwards Agreement) Calendar


See Extra High Voltage


ElectraLink Ltd is the "Service Controller" responsible for the provision of the Data Transfer Service to all parties participating in the electricity retail market, under the terms of the Data Transfer Service Agreement. ElectraLink provides other commercial data transfer services to companies in the electricity and gas industries. ElectraLink also provides the secretariat to support the gas industry's Supply Point Administration Agreement and SPAA Ltd.

Information regarding Electralink services can be found at: www.electralink.co.uk

Electricity Billing Systems

IT software application used for the production of electricity bills to consumers. In the UK, an electricity supplier is a retailer of electricity. For each supply point the supplier has to pay the various costs of transmission, distribution, meter operation, data collection, tax etc. The supplier then adds in energy costs and the supplier's own charge. (More about electricity billing systems)

Electricity CRM System

Electricity Customer Relationship Management (CRM) System is an IT software application for managing a company’s interactions with customers and sales prospects. It involves using technology to organize, automate, and synchronize business processes. (More about Electricity CRM Systems)

Electricity Forward Market

A brokered over-the-counter market in the UK for short-to-medium-term electricity derivative instruments, of which the most widely used is the electricity forward agreement.

Electricity Market Reform

The EMR is the Government‘s approach to reforming the electricity system to ensure the UK‘s future electricity supply is secure, low-carbon and affordable.

Electricity Pricing System

IT software application used by electricity supply companies for the purpose of creating quotations to consumers for the supply of electricity. (More about electricity pricing systems)

Electricity Retail Supply Systems

The retail electricity supply business is a highly complex and extensively regulated market. Participants require an Electricity Retail Supply System (software application) to automate business processes and support interaction with customers. (More about Electricity Retail Supply Systems)

Electricity Settlement Performance

Regulatory targets for electricity supplier’s settlement percentage are set and monitored by Elexon. Suppliers not achieving regulatory target incur regulatory financial penalties and impact the accuracy of customers’ bills.
The Balancing and Settlement Code (BSC) is a legal document which defines the rules and governance for the balancing mechanism and imbalance settlement processes of electricity in Great Britain.
ELEXON is known as the Balancing and Settlement Code Company (BSCCo).


The Balancing and Settlement Code Company that manages the Electricity Trading Arrangements in England, Scotland and Wales.

Elexon Charges

ELEXON’s costs and the contracted costs of BSC Agents are paid for by BSC Parties as described in Section D of the BSC. The amount each BSC Party pays (Funding Shares) depends on their market role and the volume of energy they generate, supply or trade.

Schedule of Charges: https://www.elexon.co.uk/guidance-note/schedule-main-sva-specified-charges/

Elexon charges information can be found at:

Embedded Benefits

The additional value of electricity generated by a distributed generator arising from its connection to the distribution system rather than the transmission system. E.g. due to the avoidance of transmission and distribution losses.

Generators and suppliers directly connected to the electricity transmission grid pay charges for use of the network referred to as Transmission Network use of System Charges (TNUoS). As signatories to the Balancing and Settlement Code (BSC), generators incur other charges including Balancing Services use of System charges (BSUoS) and BSCCo costs.

Smaller generators which are not connected to the transmission network but to a distribution network and are not signatories to the BSC, are not subject to these charges. These benefits from being embedded in the distribution network are known as 'embedded benefits'.

Suppliers which contract with distributed generators use the national grid less and so incur reduced charges from National Grid Company. Suppliers can pass on these savings to distributed generators (subject to negotiation).

Transmission Network Use of System charges

TNUoS charges are paid by generators to and suppliers directly connected to the electricity transmission grid to National Grid Electricity Transmission (NGET) for use of the network. The charges vary for generators and suppliers according to their location and the demand for grid usage at that location.

Balancing Services Use of System (BSUoS) charges

BSUoS charges are paid by suppliers and generators based on their energy taken from or supplied to the National Grid in each half-hour Settlement Period. These charges are paid to NGET to cover the costs of keeping the system in electrical balance and maintaining the quality and security of supply.

Transmission Losses

About 1.5 per cent of the electrical energy generated in England and Wales is lost in the transmission system.

These losses increase with the distance the electricity has to travel. Under the British Electricity Trading and Transmission Arrangements (BETTA), the cost of transmission losses is recovered by effectively scaling down the metered output of generators and scaling up the energy imported by suppliers. These losses are presently recovered on a uniform basis and divided between generators and suppliers on a 45/55 split.

Where a generator is embedded within the distribution system both the generator and the associated demand it supplies, benefit from avoiding scaling for transmission losses.

BSC Cost Recovery and Participation Charges

Elexon – the company that runs the BSC imposes a variety of charges on BSC parties to enable it to recoup its operational and development costs.  Charges are also levied on BSC parties based on the metered volumes credited to their accounts as a proportion of the total energy in the trading system. See the BSC for the full list of applicable charges.

Generator Distribution Use of System (GDUoS) charges

Charging methodologies have been produced by each Distribution Network Operator (DNO) setting out the basis for charging.

Embedded Generation

Generation plant that is connected to a distribution network, an older term for distributed generation.

Emissions Trading Scheme

The emissions trading scheme of the European Union, based on an allocated "cap" for each operator with the ability to trade for insufficient of excess allocations.


Electricity Market Reform


See Energy Networks Association


A measure of the amount of ‘work’ that can be done by, or is needed to operate, an energy conversion system, sometimes measured in ‘joules’ (J) or ‘Kilowatts hours’ (kWh).

Energy Billing Software

IT software application used for the production of electricity bills to consumers. In the UK, an electricity supplier is a retailer of electricity. For each supply point the supplier has to pay the various costs of transmission, distribution, meter operation, data collection, tax etc. The supplier then adds in energy costs and the supplier's own charge. (More about Energy Billing Software)

Energy Contract Volume Aggregation Agent

Energy contract volume aggregation agent under BETTA.

energy Management System

An energy management system (EMS) is a system of computer-aided tools used by operators of electric utility grids to monitor, control, and optimize the performance of the generation and/or transmission system. The computer technology is also referred to as SCADA/EMS or EMS/SCADA.

Energy Quoting Solution

IT software application used by electricity supply companies for the purpose of creating quotations to consumers for the supply of electricity. (More about Energy Quoting Solutions)

Energy Savings Opportunity Scheme (ESOS)

Government established ESOS to implement Article 8 (4 to 6) of the EU Energy Efficiency Directive (2012/27/EU). The ESOS Regulations 2014 give effect to the scheme.

ESOS is a mandatory energy assessment scheme for organisations in the UK that meet the qualification criteria. The Environment Agency is the UK scheme administrator.

Organisations that qualify for ESOS must carry out ESOS assessments every 4 years. These assessments are audits of the energy used by their buildings, industrial processes and transport to identify cost-effective energy saving measures.

Organisations must notify the Environment Agency by a set deadline that they have complied with their ESOS obligations

Energy Stack

The energy stack comprises of Bid Offer Acceptances in price order and is used to calculate the main energy imbalance price, once relevant tagging has been applied.


Entry Process


Entry Process Co-ordinator

Escrow Account

An account with something of value held within it under a third party to be retained until the occurrence of a contingency or a condition between two parties is met.


See - Energy Savings Opportunity Scheme

Estimated Annual Consumption

An EAC is a projection of the annualised (12 month) consumption of a customer that does not have a half hourly metering system. It is derived from the metering system’s most recent meter advance and profile information. An EAC is used when the meter has not been read in the period between the Settlement Day in question and the Settlement Run.


See Emissions Trading Scheme


Erroneous Transfer:


European Union Emission Trading Scheme: The EU-wide greenhouse gas emissions trading scheme, under which governments must set emission limits for all large emitters of carbon dioxide in their country. Each installation is then allocated an allowance for the particular phase in question, with the first phase running from 2005 – 2007 and the second from 2008 – 2012. Installations may meet their cap by either reducing emissions below the cap and selling the surplus, or letting their emissions remain higher than the cap and buying allowances from other participants in the EU emissions market.


A type of platform on which power products are sold. Typically an exchange would allow qualifying members to trade anonymously with other parties and the risks between parties would be managed by a clearing service.


The previous Public Electricity Supplier for one of the 14 electricity regions in England, Wales and Scotland.

Extra High Voltage

22,000 volts or higher voltage

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