A-Z Finder

 

M

    Maintenance Schedule

    means the combined planned outage schedule for Generator Units and for items of plant on the Transmission System.

     

    Maintenance Schedule Data Transaction

    is a Data Transaction in relation to Maintenance Schedules detailed in Appendix F: “Other Communications”.

     

    Make Whole Payment

    means a payment in respect of each Generator Unit, designed to make up any difference between the total Energy Payments to the Generator Unit in a Billing Period and the Schedule Production Cost for that Generator Unit for each Trading Period within the Billing Period (where the difference is arithmetically positive calculated over the Billing Period) as set out in paragraph 4.140 or as otherwise specified in Section 5.
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    Market Auditor

    means the person at any time appointed to perform the audit of the market in accordance with paragraph 2.131.

     

    Market Data Transactions

    are Data Transactions detailed in Appendix K: “Market Data Transactions”.

     

    Market Operator

    means EirGrid plc and SONI Limited solely in their respective roles as the undertakings authorised by the Regulatory Authorities to perform the Market Operator function pursuant to the Market Operator Licences and any relevant exemption, with their rights, powers, functions, obligations and liabilities under this Code in that role alone being joint and several.

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    Market Operator and System Operator Data Transactions

    are Data Transactions detailed in Appendix J: “Market Operator and System Operator Data Transactions”.

     

    Market Operator Charge

    means a charge levied on Participants intended to recover costs and expenses of the Market Operator which shall be calculated pursuant to paragraphs 6.143 to 6.151.

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    Market Operator Charge Account

    means either or both, as the context may require, of the accounts set up in the SEM Bank to receive payments by Participants in respect of the Market Operator Charge.

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    Market Operator Charge Invoice Data Transaction

    is a Data Transaction in relation to Invoices for Market Operator Charges detailed in Appendix G: “Invoices and Settlement Statements”.

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    Market Operator Licence

    means the Licence(s) issued to the person or persons acting as Market Operator from time to time.

     

    Market Price Cap

    means the maximum permitted value for the System Marginal Price (SMP) determined by the MSP Software for any Trading Period, determined in accordance with paragraph 4.12.

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    Market Price Floor

    means the minimum permitted value for the System Marginal Price (SMP) determined by the MSP Software for any Trading Period, determined in accordance with paragraph 4.12.

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    Market Schedule Quantity

    means the quantity of Output for each Generator Unit in each Trading Period, prior to adjustment for Transmission Losses or Distribution Losses, as calculated by the MSP Software or otherwise in accordance with Section 4, Section 5 and Appendix N: “Operation of the MSP Software”, and which is the basis for its Energy Payments as set out in paragraph 4.93.

     

    Market Schedule Start

    means that for any Trading Period h in which a Generator Unit has a Market Schedule Quantity greater than zero MW and in the preceding Trading Period (h-1) that Unit has a Market Schedule Quantity equal to zero MW, the Generator Unit is scheduled to perform a Market Schedule Start in Trading Period h.  Otherwise the Generator Unit has no Market Schedule Start in the Trading Period.

     

    Market Schedule Warmth State

    means the calculated Warmth State (being Cold, Warm or Hot) of a Generator Unit at the start of a Trading Period consistent with the Market Schedule Quantities for that Generator Unit in preceding Trading Periods and the definitions of Cold Start, Warm Start and Hot Start.

     

    Market Start Date

    means the date of SEM go-live, as determined by the Regulatory Authorities or other Competent Authority as appropriate.

     

    Maximisation

    a Generator Unit is treated as being subject to Maximisation in a Trading Period as set out in Appendix O: “Instruction Profiling Calculations”.

     

    Maximisation Flag

    means a flag to indicate the Trading Periods for which a Generator Unit is operating in accordance with a Maximisation Instruction for the purpose of Appendix O: “Instruction Profiling Calculations” only.

     

    Maximisation Instruction

    means an instruction of that name issued by a System Operator in accordance with the applicable Grid Code.

     

    Maximum Down Time

    means the maximum period of time during which Demand Reduction at a Demand Side Unit can be Dispatched.

     

    Maximum Export Available Transfer Capacity

    means the maximum Available Transfer Capacity for export out of the Pool for the relevant Interconnector, as set out in paragraph 5.42.

     

    Maximum Export Capacity

    means the maximum export capacity of a site in MW as defined under the site’s Connection Agreement or equivalent, or in the case of an Aggregated Generator, the Aggregated Maximum Export Capacity of all sites containing Generators that form part of the Aggregated Generator

    means the maximum export capacity of a site in MW as defined under the site’s Connection Agreement or equivalent.

     

    Maximum Generation

    means the maximum Output for a Generator Unit.

     

    Maximum Import Available Transfer Capacity

    means the maximum Available Transfer Capacity for import into the Pool for the relevant Interconnector, as set out in paragraph 5.41.

     

    Maximum Import Capacity

    means the maximum import capacity of a site in MW as defined under the site’s Connection Agreement or equivalent.

     

    Maximum Interconnector Unit Export Capacity

    means the upper limit of export an Interconnector Unit is declaring as part of its Commercial Offer Data.

     

    Maximum Interconnector Unit Import Capacity

    means the upper limit of import an Interconnector Unit is declaring as part of its Commercial Offer Data.

     

    Maximum On Time

    means the maximum time for which a Generator Unit can run following Start Up.

     

    Maximum Ramp Down Rate

    means the maximum Ramp Down Rate of a Demand Side Unit.

     

    Maximum Ramp Up Rate

    means the maximum Ramp Up Rate of a Demand Side Unit.

     

    Maximum Storage Capacity

    is part of the Technical Offer Data for a Pumped Storage Unit and means the maximum quantity of Generation that can be produced by the reservoir for a Trading Day submitted in accordance with 5.113.

     

    Meeting

    means a meeting of the Modifications Committee and shall include, where the context so permits or requires, an Emergency Meeting.

     

    Meter Data

    means data obtained from a metering system, including the processed data or substituted data, that is used for settlement and for network purposes.

     

    Meter Data Export Date

    means the first Trading Day from the start of which Metered Generation data for a Generator Unit is provided to the Market Operator by the relevant Meter Data Provider, where such data may not yet be validated.

     

    Meter Data Provider

    means any System Operator and Distribution System Operator that is obliged under Appendix L “Meter Data Transactions” to submit Meter Data to the Market Operator.

     

    Meter Data Transactions

    are Data Transactions detailed in Appendix L: “Meter Data Transactions”.

     

    Meter Point Registration Number

    means the Meter Point Reference Number as defined in the applicable Metering Code.

     

    Meter Validation Date

    means the first Settlement Day from the start of which Metered Generation data for a Generator Unit is provided to the Market Operator by the relevant Meter Data Provider, where such data has been validated. The Meter Data Provider and/or the Participant, as appropriate, shall use reasonable endeavours to ensure that this date is no later than 10 Working Days after the first date that non-zero Metered Generation data has been recorded for that Generator Unit.

     

    Metered Demand

    means the Demand-related Meter Data with respect to a Supplier Unit

     

    Metered Generation

    means the Active Power produced by a Generator Unit at the Export Point.

     

    Metering Code

    means, for Ireland, the code of that name prepared by the Distribution System Operator(s) and approved by the Commission, as from time to time revised, amended, supplemented or replaced with the approval of or at the instance of the Regulatory Authorities; and

    means, for Northern Ireland, the subset of the Northern Ireland Grid Code pertaining to meter reading, Meter Data processing and Meter Data communications;

    or for Ireland the “Retail Market Design” and for Northern Ireland the “Market Registration Code” as appropriate.

     

    Minimum Down Time

    means the minimum period of time during which Demand Reduction at a Demand Side Unit can be Dispatched.

     

    Minimum Generation

    means the minimum level of Generation for a Generator Unit, which will be set equal to Minimum Stable Generation for that Generator Unit.

     

    Minimum Interconnector Export Level

    means the level (expressed as a number in MW which is negative or zero), the absolute value of which relates to the minimum stable level at which that Interconnector may be dispatched to export energy.  A value of zero is equated with the case in which no such minimum level applies.  A value which is less than zero means that the Interconnector may not be Dispatched at any level strictly between zero and the Minimum Interconnector Export Level. .  The Interconnector Registration Data separately records whether or not the Interconnector may be dispatched at zero.

     

    Minimum Interconnector Import Level

    means the level (expressed as a number in MW which is positive, including zero) the value of which relates to the minimum stable level at which that Interconnector may be dispatched to import energy.  A value of zero is equated with the case in which no such minimum level applies.  A value which is greater than zero means that the Interconnector may not be Dispatched at any level strictly between zero and the Minimum Interconnector Import Level. The Interconnector Registration Data separately records whether or not the Interconnector may be dispatched at zero.

     

    Minimum Interim Margin

    means the lowest Interim Margin quantity, for the purposes of Appendix M: “Description of the Function for the Determination of Capacity Payments” only.

     

    Minimum Off Time

    means the minimum time that a Generator Unit must remain producing no Active Power commencing at the time when it first stops producing Active Power.

     

    Minimum On Time

    means the minimum time that must elapse from the time a Generator Unit is instructed to Start Up before it can be instructed to shut down.

     

    Minimum Output

    means the minimum level of Output at which a Generator Unit may operate, which is zero except as otherwise specified in the Code.

     

    Minimum Stable Generation

    means the level of minimum sustainable Output in accordance with the Grid Code which a Generator Unit is capable of producing.

     

    Modification

    means a modification, revision, amendment, supplementation, extension, consolidation or replacement to the provisions of the Code which is accepted and implemented in accordance with paragraphs 2.188 to 2.236 and which shall, for the avoidance of doubt, include a modification of or addition to the Agreed Procedures.

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    Modification Proposal

    means any proposal to modify the Code which is submitted to the Modifications Committee in accordance with the Modifications Process.

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    Modification Recommendation Report

    means a report created by the Modifications Committee and sent to the Regulatory Authorities containing the Final Modification Recommendation on a Modification Proposal and all supporting detail to aid the Regulatory Authorities’ decision on the Modification Proposal developed by the Modifications Committee.

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    Modifications Committee

    means the committee established from time to time for the purpose of processing Modification Proposals in accordance with paragraphs 2.150 to 2.182.

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    Modifications Process

    means the process of submitting, assessing and accepting or rejecting Modification Proposals in accordance with paragraphs 2.188 to 2.236.

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    Modifications Website

    means the website referred to in paragraph 2.229.

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    Modified Interconnector Unit Nominations

    means for each Interconnector Unit in each Trading Period, a value expressed in MW which is calculated in accordance with paragraph 5.59.

     

    Modified Interconnector Unit Nominations Data Transaction

    is a Data Transaction in relation to Modified Interconnector Unit Nominations detailed in Appendix K: “Market Data Transactions”.

     

    Month

    means one calendar month, starting at midnight on the first calendar day of such month.

     

    Monthly Combined Load Forecast

    means the sum of the submitted values for each Trading Period h, of the Monthly Load Forecast for each Jurisdiction within the relevant Month.

     

    Monthly Load Forecast

    means the forecast of Demand to be met by Generator Units (other than Autonomous Generator Units that are not Wind Power Units) at the point where the Units are Connected (i.e. prior to the application of Combined Loss Adjustment Factors), but net of Unit Load for Generator Units, for each Trading Period in the next Month.

     

    Monthly Load Forecast Data Transaction

    is a Data Transaction in relation to Monthly Load Forecasts detailed in Appendix K: “Market Data Transactions”.

     

    Moody’s Investor Services Inc.

    means the credit rating agency of that name.

     

    MSP Failure

    means the failure of the MSP Software to produce a Valid MSP Solution.

     

    MSP Production Cost

    means the production cost in a Trading Period of a Price Maker Generator Unit that is not Under Test, at a given level of Output, for the purposes of the MSP Software, and is calculated in accordance with Appendix N: “Operation of the MSP Software”.

     

    MSP Software

    means the “Market Scheduling and Pricing” software used by the Market Operator to determine Market Schedule Quantities for each Price Maker Generator Unit and to determine the System Marginal Price for each Trading Period.

     

    MSP Software Run Type

    means one of the following types of run of the MSP Software: Ex-Ante Indicative MSP Software Run, Ex-Post Indicative MSP Software Run or Ex-Post Initial MSP Software Run which are defined within Appendix N: “Operation of the MSP Software”.

     

    MW Tolerance

    means the tolerance value in MW within which a Generator Unit is deemed to be complying with its Dispatch Instruction, before consideration of frequency response, which is used in the calculation of Uninstructed Imbalances.

     

    MW/Time Co-ordinate

    means a co-ordinate representing a combination of MW Instructed Quantity and time on the Instruction Profile, for the purpose of Appendix O: “Instruction Profiling Calculations” only.

     

SEMO is a joint venture between EirGrid PLC and SONI Limited