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Market Asset Provider

A party that provides the relevant meter asset.

Market Cash Out

The general term describing the system buy, system sell prices under BETTA and the buy price under the renewables obligation.

Market Coupling

Market coupling is a method for integrating electricity markets in different areas, applied across a number of European countries.

Market Domain Data

Market Domain Data is the central repository of reference data used by Suppliers, Supplier Agents and Licensed Distribution System Operators (LDSOs) in the retail electricity market. It is essential to the operation of Supplier Volume Allocation (SVA) Trading Arrangements. MDD is produced by the Supplier Volume Allocation Agent (SVAA) in the form of Data Transfer Network (DTN) flows D0269 (Market Domain Data Complete Set) and D0270 (Market Domain Data Incremental Set).

Information regarding the MDD can be found at: http://www.elexon.co.uk/reference/technical-operations/market-domain-data/

Market Domain I.D.

A unique role identifier published by ISRA and/or SVAA which identifies a person by role and name and which can only exist on one gateway at any one time.

Market Fundamentals

Factors that principally drive the market sentiment, i.e. demand, costs, outages, power stack, etc.

Market Index Price

The Market Index Price (MIP) is used to set the reverse Energy Imbalance Price. It is calculated based on short term trading activity on exchanges. Currently the MIP is set based on selected trades undertaken on the APX and N2EX exchanges over a period of 20 hours before gate closure.

Market Participant

An organisation that is currently approved for operation in the Trading Arrangements.


To mark-to-market is to calculate the value of a financial instrument (or portfolio of such instruments) at current market rates or prices of the underlying. Marking-to-market on a daily (or more frequent) basis is often recommended in risk management guidelines.

Master Registration Agreement

The overall agreement which has to be signed by participants who wish to supply electricity to consumers.

Maximum Demand

MD – the MD value is the largest of the half-hourly demand (kW) values recorded by the metering system during a period typically 12 months. MD metered customers are allocated to one of four Classes on the basis of a ‘load factor’ calculation.

The load factor (LF) measures the ‘peakiness’ of a customers annual demand shape. This value is equal to the customers actual annual consumption (kWh) divided by product of the MD value (kW) and the number of hours in a year (8,760 = 365 x 24), expressed as a percentage.

A customer with a low load factor has a relatively peaky profile.

The four MD Profile Classes are:

  • Non-domestic MD with LF less than or equal to 20%
  • Non-domestic MD with LF greater than 20% and less than or equal to 30%.
  • Non-domestic MD with LF greater than 30% and less than or equal to 40%.
  • Non-domestic MD with LF greater than 40%.

Measurement Class


Master Connection and Use of System Agreement


See Maximum Demand


Market Domain Data


Maximum Delivery Period


Maximum Demand Register


Maximum Delivery Volume


Metering Equipment


Standard measure of generating plant capacity equal to one thousand kilowatts, or one million watts. Medium to large power stations have capacity typically in the range of 500 MW to 2,00 MW.


Maximum Export Limit


A device for measuring Active Energy or Reactive energy.

Meter Advance

The meter advance is the difference in the meter consumption between two sequential meter readings.

Metered Position

The actual volume of electricity generated or consumed by a participant. It is the sum of the actual volume of electricity imported or exported at each BMU.

Metering System Identifiers

Each metering system is allocated a unique identifier called Metering System Identifiers (MSIDs), and is made up of three components of the MPAN number Distribution Identifier, Unique Ref Number & Check Digit also know as MPAN Core No.

Meter Standing Data

The data (as specified in the DTC) relating to the configuration of any metering equipment which is required to operate that equipment in an efficient manner.

Meter Timeswitch Code

The MTC allows access to information which can be used for pricing purposes:

  • TPR Count
  • Standard Settlement Configuration
  • Whether or not the meter has a tariff-related MPAN which should be registered
  • Meter type (credit, prepayment etc.)
  • Programmable or non-programmable
  • Comms link Indicator (Yes/No)
  • Status

Information available from this code is:


MTC Start  MTC End  Allocation
0 399 PES specific codes
400 499 Unmetered Supplies
500 799 Tariff – related MPAN Codes
800 999 Common Codes

‘Common Code’ is defined as a code which covers a large number of customers and can be covered by one or many supplies. If it is a PES specific code the MTC is unique to the PES and MTC 123 in EEB may not be the same as 123 in EMEB.

500 – 799 have tariff-related MPAN numbers. A tariff-related MPAN is defined as meaning two or more  non-half hourly meters, at the same premises, billed to the same customer where either of the following conditions apply:

a. Where more than one meter is required to implement the tariff
b. Where a restricted hour/secondary meter exists.

The MTC status code flag indicates if a MTC is New, Existing, Deleted, Updated since previous release or Warning – deleted at next release.


Microgeneration is the generation of zero or low-carbon heat and power by individuals, small businesses and communities to meet their own needs. Microgeneration refers to a number of different sustainable or highly efficient fossil fuel technologies that can generate heat and/or electricity in the domestic and commercial sector. Some forms of micro power use fuels or energy sources that produce no greenhouse gases and are therefore, classed as renewable energy, thus helping to combat climate change. Wind turbines, micro-hydro systems, heat pumps and Micro-Combined Heat and Power [CHP] are just three of the many types of small scale generation technologies which can help to attain at least two of the energy policy objectives; reductions in CO2 emissions and reliability of supply.


Market Index Data


Maximum Import Limit


See - Market Index Price

Monitoring and Targeting

The purpose of monitoring and targeting (M&T) is to relate your energy consumption data to the weather, production figures or other measures in such a way that you get a better understanding of how energy is being used. In particular, it will identify if there are signs of avoidable waste or other opportunities to reduce consumption.

Data collection may be manual, automated, or a mixture of the two. Once an M&T scheme has been set up, its routine operation should be neither time-consuming nor complex. An M&T scheme will provide essential underpinning for your energy management activities.


Meter Operator – means an Accredited agent appointed by a supplier, or, where applicable, a customer to:

(i) install, commission, test, repair and maintain metering equipment; and

(ii) maintain related technical information.


Metering Point Administration Number: Unique National, 13 digit number Reference for a Metering System. The MPAN must be on all suppliers’ customers’ invoices.


Meter Point Administration Service


Market Participant ID


Meter Point Reference


The MRA is the multi-party agreement that all Ofgem licensed Suppliers and Distribution Business enter into that governs the essential interactions between them when retail customers wish to change their supplier from one company to another.


MRASCo is the "not for profit" company funded by MRA parties and established under the MRA that provides, either directly or through contracts, the secretariat services that are required to administer the MRA and undertake any development activities required by the UK retail electricity market.

MRASCo Dataflow

Dataflows are sent between market participants over the Data Transfer Network. The DTC accommodates the inter-operational exchange of information enabling effective interface between industry participants. See MRASC0 DTC or (More about MRASCo Dataflow)


The MRASCo Data Transfer Catalogue – DTC document the formats and structure of dataflows that accommodates the inter-operational exchange of information enabling effective interface between industry participants. (More about MRASCo DTC)


The meter reading issued for use as the initial meter reading for the New Supplier and the final meter reading for the Old Supplier on a change of supply.


See Meter System Identifier.


Monitoring and Targeting

Energy monitoring and targeting (M&T) is an energy efficiency technique based on the standard management axiom stating that “you cannot manage what you cannot measure”. M&T techniques provide energy managers with feedback on operating practices, results of energy management projects, and guidance on the level of energy use that is expected in a certain period. 


Meter Timeswitch Code


Million tonnes of Carbon.


Meter Technical Details – as per the D0149 & D0150


Meter Volume Reallocation Notification Agent






Minimum Zero Time

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