ANNEXUREB

DEFINITIONS

B1SteamPowerStation

B1.1AuxiliaryEnergyConsumptionInrelationtoanyperiod,theratio,expressedasapercentage,of

(a) gross energy in kwh generated at Generator terminals minus netenergyinkwhdeliveredattheGeneratingStationSwitchyard

to

(b)grossenergyinkwhgeneratedattheGeneratorterminals.

B1.2AvailableCapacityInrelationtoSettlementPeriod,thesumof

(a)Powerdeliveredordeemedtobedelivered(incaseofbackingdown)attheswitchyard

and

(b)Auxiliarypowerconsumption,

Explanation (1) : Auxiliary power consumption shall be the average value based onAuxiliaryEnergyConsumptionatthePLFordeemedPLFduringtheSettlementperiod.

Explanation(2):TheavailablecapacityshallnotexceedtheInstalledCapacity

B1.3CommercialOperationDateorCODInrelationtoaUnit,datebywhichthe Maximum Continuous Rating (MCR) or acceptable installed capacity isdemonstrated by a Performance Acceptance Test as per international codes, aftersuccessful trial operation including stabilisation. The COD of the Generating StationshallbereckonedfromtheCODofthelastUnit.

B1.4 DeemedPlant Load Factor In relation to any period of operation of theGeneratingStation,theratio,expressedasapercentage,of

a)ThesumofAvailableCapacityforeachSettlementPeriod

to

b)InstalledCapacitymultipliedbythenumberofSettlementPeriods

B1.5 Demonstrated Capacity In relation to a Unit, the electric output atGeneratorterminalsdemonstratedatratedparametersduringPerformanceAcceptanceTest as per international codes such as ASME PCT 6, after successful trial operationincludingstabilisation.

Explanation:TheDemonstratedCapacityshallbecorrectedfor47.5Hzgridfrequencyand worst circulating water inlet temperature for the purpose of arriving at theInstalledCapacity.

B1.6GeneratingStationUnitandbalanceofplant

B1.7 Gross calorific Value or GCV The heat produced in kCal by completecombustionofonekg.ofsolidfuelorliquidfueloronestandardcubicmetre(Sm3) ofgaseousfuel,asperIS:1350(PartII)orIS:1448(P:6)asthecasemaybe.

Explanation: Incaseofcoalor lignite fuel, theGCVof the fuelas receivedshallbereduced by 100 kCal/kg to arrive at theGCV of the fuel as fired for the purpose ofdeterminationofthefuelconsumption

B1.8 Gross Heat Rate or GHR The heat energy in kCal input to Turbine GeneratorcycletogenerateonekwhofelectricenergyatGeneratorterminals.

B1.9 InstalledCapacity In relation to aGenerating Station, RatedCapacity orsumoftheDemonstratedCapacityoftheUnitsintheGeneratingStation,whicheverisless.

Explanation : Installed Capacity shall be maintained down to 47.5 Hertz (Hz) gridfrequency,withworstcirculatingwaterinlettemperatureandwithworstfuel.

B1.10MaximumContinuousRatingorMCRInrelationtoaUnit,themaximumContinuous output at the Generator terminals, guaranteed by the manufacturers atratedparametersasperIEC45

Explanation :MCR shall bemaintaineddown to 47.5Hertz (Hz) grid frequency,withworstcirculatingwaterinlettemperatureandwithworstfuel.

B1.11NetcalorificValueorNCVGrossCalorificValueminustheheatlossduetototalmoistureincompletecombustionofonekilogramofsolidfuelorliquidfueloronestandardcubicmetreofgaseousfuel,expressedinkCal/kgorSm3

B1.12 NetHeatRateor NHR Theheat energy in kCal, input to aGeneratingStationtodeliveroneKwhattheswitchyard.

B1.12.1NetHeatRateFormulations

ThedailyNetHeatRateatanyloadingoftheGeneratingStationshallbe(a)guaranteedNetHeatRate corresponding to the loadingof theGeneratingStationmultipliedby1.05or(b)thevaluedeterminedbythefollowingformulae,whicheverisless

DNHR=GHRX100100X100AECSGE

Where,DNHRistheNetHeatRateoftheGeneratingStationduringadayinKcal/Kwh,

GHRistheGrossHeatRateoftheTurbineGeneratorCycleinkCal/kWhcorrespondingtotheloadingoftheTurbineGeneratorduringtherelevantday,asperpara1.1.4.1ofOperationNorms

SGEistheSteamGeneratorEfficiencyexpressedinpercentage,asperpara1.1.4.1.1ofOperationNorms.

AEC is theAuxiliaryEnergyConsumption,correspondingtothe loadingof theTurbineGenerator during the relevant day, expressed in percentage, as per para 1.1.4.1 ofOperationNorms.

ThemonthlyaverageNetHeatRateshallbecalculatedbyweightedaverageasperthefollowingformula:

MNHR=Sumof(DNHRxNkWh)duringthemonthSumofNkWhduringthemonth

Where,MNHRisthemonthlyaverageNetHeatRateinkCal/kWh,

DNHRistheNetHeatRateforadayinkCal/kWh

NkWhisthenetkWhdeliveredattheswitchyardduringtherelevantday

Note (1) : The guaranteed Net Heat Rate shall be at design cooling water inlettemperature corresponding to 90% duration and adjustment for ash, moisture andhydrogencontentofprimaryfuel,exceptforCorexgas.

Note(2): IncasetheguaranteedNetHeatRate isnotavailable , theNetheatRateshall be determined based on guaranteed Gross Heat Rate of Steam Turbine Generator Cycle at design cooling water inlet temperature corresponding to 90%duration, guaranteed Steam Generator Efficiency with adjustment for ash, moistureand hydrogen content except for Corex gas and Auxiliary Energy consumption anddegradationmultiplyingfactorof1.05.

B1.13'OperationandMaintenanceExpenses'or'O&MExpenses'Inrelationtoa period, the expenditure incurred in operation and maintenance of the generatingstation including manpower, spares, consumables (including water), insurance andoverheads.

B1.14 'Plant Life' As per Government of India Gazette Notification No. 265 (E)dated29thMarch,1994,asamendedfromtimetotime.

B1.15'PlantLoadFactor'or'PLF'Inrelationtoanyperiod,theratio,expressedasapercentage,of

a)totalkWhgeneratedatGeneratorterminals

to

b)InstalledCapacity,expressedinkilowatts(kW)multipliedbynumberofhoursintherelevantperiod,

B1.16 'Rated Capacity' In relation to the Generating Station, the MaximumContinuous Rating (MCR) of a Unit multiplied by number of Units in the GeneratingStation.

B1.17'SettlementPeriod' Anhouror any other agreedperiod duringwhich theAvailableCapacityshallbetakenasconstantandequaltotheaveragecapacityduringtheperiod.

B1.18'SteamGeneratorEfficiency'Theratio,expressedasapercentage,of

a)GrossCalorificValue(GCV)ofthefuelfiredminustheheatlossesintheSteamGeneratorperunitquantityof fuel,asper internationalcodes,butwithoutheatcredit.

to

b)GrossCalorificValueofthefuelfired.

B1.19'Unit'SteamGeneratorTurbineGeneratorandtheirauxiliaries.

B2CombinedCycleCombustionTurbine(CCCT)GeneratingStation

B2.1 Auxiliary Energy Consumption In relation to any period, the ratio,expressedasapercentage,of

(a) gross energy in kWh generated at Generator(s) terminals minus netenergyinkWhdeliveredattheswitchyard

to

(b)grossenergyinkWhgeneratedattheGenerator(s)terminals,

B2.2CalorificValue:

B2.2.1 Gross Calorific Value or GCV the heat produced in kCal by completecombustion of one kilogram (Kg) of liquid fuel expressed in kCal/kg as per latestversionof IS:1448 (P:6)oronestandardcubicmetreofgaseous fuelexpressed inkCal/Sm3asperlatestversionofASTMD3588.

B2.2.2NetCalorificValueorNCVGrossCalorificvalueminustheheatlossesdue tomoisture in complete combustion of one kilogramof liquid fuel, expressed inkCal/kg, as per latest version of IS: 1448 (P : 6) or one standard cubic metre ofgaseousfuelexpressedinkCal/Sm3asperlatestversionofASTMD3588.

B2.3Capacity:

B2.3.1MaximumContinuousRatingorMCRInrelationtoaUnitorBlock,themaximum continuous output at the Generator(s) terminals, guaranteed by themanufacturer with Water/steam injection (if applicable) at ISO2314 and ISO 3977referenceconditionsandcorrectedto50Hzgridfrequencyandsiteconditions.

Explanation:Siteconditionsrefertoannualmeandrybulbtemperature,annualmeanrelative humidity, site atmospheric pressure and worst circulating water inlettemperature.

B2.3.2 Rated Capacity In relation to the Generating Station, the MaximumContinuousRating(MCR)ofBlockmultipliedbythenumberofBlocksintheGeneratingStation.

B2.3.3DemonstratedCapacityInrelationtoaUnitorBlock,theelectricoutputatGenerator(s) terminals demonstrated during Performance Acceptance Test as perlatestversionsofISO2314/ASMEPTC22forCombustionTurbineandASMEPTC6forSteamTurbineaftersuccessfultrailoperationandcorrectedto50zgridfrequencyandsiteconditionsasatB2.3.1above.

B2.3.4InstalledCapacityInrelationtotheGeneratingstation,

For the first year of plant operationreckoned from COD of the GeneratingStation:

Rated capacity or sum of theDemonstrated capacities of the Blocks intheGeneratingStationwhicheverisless.

Forsubsequentyearsofplantoperation: InstalledCapacityofGeneratingstationinany year is to be determined bymultiplying the first year InstalledCapacity by Capacity Degradation Factorfor the corresponding year as given inOperationNorms

B2.3.5AvailablecapacityInrelationtoanysettlementperiod,thesumof

a)Powerdeliveredordeemedtohavebeendelivered(incaseofbackingdown)atswitchyard

and

b) Auxiliary Power Consumption and corrected to average dry bulbtemperatureoftheSettlementPeriod.

Explanation: 1. Auxiliary Energy Consumption as per operation norms shall betakenasAuxiliaryPowerConsumptionforthispurpose.

2. Available capacity, when corrected to site conditions as at B2.3.1above,shallnotexceedtheInstalledCapacity.

B2.4CommercialOperationDateorCODInrelationtoaUnitorBlock,dateby which the Maximum Continuous Rating (MCR) or acceptable installed capacity isdemonstrated by Performance Acceptance Test as per latest versions of ISO2314/ASME PTC22 for Combustion Turbine andASME PTC6 for SteamTurbine aftersuccessful trial operation including stabilisation. The COD of the Generating StationshallbereckonedfromtheCODofthelastBlock.

B2.5HeatRate:

B2.5.1GrossHeatRate or GHR The heat energy in kCal input to theUnit orBlockorGenerating station to generate one kWhof electric energy from theUnit orBlockorGeneratingstationatGeneratorsterminals.

B2.5.2NetHeatRateorNHRTheheatenergyinkCal.inputtotheUnitorBlockGeneratingStationtodeliveronekWhofelectricenergyattheswitchyard.

Explanation:ThegrossHeatRateandaNetHeatRateshallbebasedonNCVoffuel.

B2.5.2.1NetHeatRateFormulations

A)TheNetHeatRate foraSettlementPeriodatany loadingof theCCCTGeneratingStationshallbea)guaranteedNetHeatRateatsiteambientconditionscorrespondingtoloadingoftheGeneratingStationmultipliedby1.035orb)thevaluedeterminedbythefollowingformula,whicheverisless:

100SNHR=GHRX100AEC

Where, SNHR is theNetHeat Rate of theGenerating Station, in kCal/Kwh, during aSettlementPeriodincombinedcyclemode.

GHRistheGrossHeatRateoftheCCCTGeneratingStationinkCal/kWhcorrespondingto the loadingof theGeneratingStationduring the relevantSettlementPeriodasperpara 1.1.4.2.1 of Operating Norms and corrected to site ambient conditions as permanufacturers correction factors to take into account the deviations from standardreferenceconditionsofISO2314andISO3977.

AEC is theAuxiliaryEnergyConsumptionof theGeneratingstation in combinedcyclemodeexpressedinpercentage.

ThemonthlyaverageNetHeatRateshallbecalculatedbyweightedaverageasperthefollowingformula:

Sumof(SNHRxNkWh)duringthemonthMNHR=SumofNkWhduringthemonth

Where,MNHRisthemonthlyaverageNetHeatRateinkCal/kWh,

SNHRistheNetHeatRateforaSettlementPeriodinkCal/kWh.

NkWhisthenetelectricenergyinkWhdeliveredattheswitchyardduringtherelevantSettlementPeriod.

B) For Unit(s) operating in simple cycle mode, the Net Heat Rate for a SettlementPeriodatanyloadingshallbea)guaranteedNetHeatRateatsiteambientconditionscorrespondingtoloadingoftheUnitmultipliedby1.0325orb)thevaluedeterminedbythefollowingformula,whicheverisless:

100SNHR(SC)=GHR(SC)X100AEC(SC)

Where,SNHR(SC) is theNetHeatRateof theUnit inkCal/kWhduringaSettlementPeriodinsimplecyclemode.

GHR(SC)istheGrossHeatRateoftheUnitinkCal/kWhcorrespondingtoitsaverageloadingduringtherelevantSettlementPeriodasperpara1.1.4.2.2ofOperatingNormsfor simple cyclemode of operation and corrected to site ambient conditions as permanufacturers correction factors to take into account the deviations from standardreferenceconditionsofISO2314.

AEC (SC) is the Auxiliary Energy Consumption of the Unit in simple cycle modeexpressedinpercentage

Note:1.Siteambientconditions,forthepurposeofdeterminingGrossHeatRate to account for deviations from ISO conditions, refer to annual mean dry bulbtemperature,annualmeanrelativehumidity,siteatmosphericpressureandcondenservacuumbasedoncoolingwaterinlettemperaturecorrespondingto90%duration.

2.Whereacombinationoffuels(e.g.NaturalGasandNaphtha)isused,therespectivenetheatrateforaSettlementPeriodshallbecalculatedseparatelyforeachfuel.

B2.6OperationandMaintenanceExpensesorO&MExpenses

In relation toaperiod, theexpenditure incurred inoperationandmaintenanceof theGenerating Station including expenses towards manpower, spares, consumables(includingwater),insuranceandoverheads.

B2.7PlantLifeAsperGovt. of IndiaGazetteNotificationNo.265 (E) dated29thMarch1994,asamendedfromtimetotime.

B2.8PlantLoadFactor:

B2.8.1PlantLoadFactororPLFInrelationtoanyperiod,theratioexpressedasapercentageof

(a)ThesumoftotalkWhdeliveredattheswitchyardandAuxiliaryEnergyconsumptionasperoperationnorms

to

(b) Installed Capacity, expressed in KiloWatts (kW) multiplied by thenumberofhoursintherelevantperiod.

B2.8.2DeemedPlantLoadFactor In relation toanyperiodofoperationof theGeneratingStation,theratioexpressedaspercentageof

a)ThesumofAvailableCapacitiesforeachSettlementPeriodto

b)InstalledCapacitymultipliedbythenumberofSettlementPeriods

B2.9PlantConfiguration:

B2.9.1UnitInrelationtoCCCTGeneratingStation:CombustionTurbineGenerator

andauxiliaries.

B2.9.2 Block In relation to CCCT Generating Station: Combustion turbine Generator(s), associatedWaste Heat Recovery boiler(s), connected Steam Turbine Generatorandauxiliaries.

B2.9.3GeneratingStationInrelationtoCCCTGeneratingStation:CCCTBlock(s)andbalanceofplant.

B2.10 'Settlement Period' An hour or any other mutually agreed period duringwhichtheavailablecapacityshallbetakenasconstantandequaltoaveragecapacityduringtheperiod.

B3DieselGeneratingStation

B3.1 'Auxiliary Energy Consumption' In relation to any period, the ratio,expressedasapercentage,of

(a) gross energy in kWh generated at Generator(s) terminals minus netenergyinkWhdeliveredattheswitchyard.

to

(b)grossenergyinkWhgeneratedattheGenerator(s)terminals,

B3.2CalorificValue:

B3.2.1 'Gross Calorific Value' or 'GCV' The heat produced in KCal by completecombustion of one kilogram (Kg) of liquid fuel expressed in 'KCal/Kg' as per latestversionofIS:1448(P:6).

B3.2.2'NetCalorificValue'or'NCV'GrossCalorificvalueminustheheat lossesdue tomoisture in complete combustion of one kilogramof liquid fuel, expressed in'Kcal/kg',asperlatestversionofIS:1448(P:6).

B3.3Capacity:

B3.3.1 ' Maximum Continuous Rating' or MCR' In relation to a Unit themaximum continuous output at the Generator terminals, guaranteed by themanufactureratISO3046referenceconditionsandcorrectedto50Hzgrid frequencyandsiteconditions.

Explanation:Siteconditionsrefertoannualmeandrybulbtemperature,annualmeanrelativehumidityandmaximumchargeaircoolanttemperature.

B3.3.2 'Rated Capacity' In relation to the Generating Station, the MaximumContinuous Rating (MCR) of unitmultiplied by the number of units in theGeneratingStation.

B3.3.3 'Demonstrated Capacity' In relation to a Unit, the electric output atGenerator terminals demonstrated during Performance Acceptance Test as per latestversionsofISO3046forDieselEngineandIS:4722,IS:5422,IS:7132andIEC34forGenerator after successful trial operation and corrected to 50Hz grid frequency andsiteconditionsasatB3.3.1above.

B3.3.4'InstalledCapacity'InrelationtotheGeneratingstation,RatedcapacityorsumoftheDemonstratedcapacitiesoftheunitsinthegeneratingstationwhicheverisless.

B3.3.5'Availablecapacity'Inrelationtoanysettlementperiod,thesumof

a)powerdeliveredordeemedtohavebeendelivered(incaseofbackingdown)atswitchyard

and

b)Auxiliarypowerconsumption

andcorrectedtoannualmeandrybulbtemperatureatsiteand50Hzgridfrequency.

Explanation: 1. Auxiliary Energy consumption shall be taken as Auxiliary Powerconsumptionforthispurpose.

2.AvailablecapacityshallnotexceedtheInstalledCapacity.

B3.4'CommercialOperationDate'or'COD' InrelationtoaUnit,datebywhichthe Maximum Continuous Rating (MCR) or acceptable installed capacity isdemonstratedbyaPerformanceAcceptanceTestasperlatestversionsofISO3046forDiesel Engine and IS:4722, IS : 5422, IS:7132 and IEC34 for Generator aftersuccessful trial operation including stabilisation. The COD of the Generating StationshallbereckonedfromtheCODofthelastUnit.

B3.5 'Generating Station' In relation to Diesel Engine Generating Station : DGunitsandbalanceofplant

B3.6HeatRate:

B3.6.1 'GrossHeatRate' orGHR' The heat energy in kCal input to the Unit togenerateonekWhofelectricenergyatGeneratorterminals.

B3.6.2'NetHeatRate'or'NHR'TheheatenergyinkCal, inputtotheGeneratingStationtodeliveronekWhattheswitchyard.

Explanation:Inrelationto,DieselEngineGenerator(DG)Unit, theGrossHeatRateandtheNetHeatRateshallbebasedonNCVoffuel.

B3.6.2.1NetHeatRateFormulations

ThedailyNetHeatRateoftheGeneratingStationshallbedeterminedbythefollowingformula:

100DNHR=GHRX100AEC

Where,DNHRistheNetHeatRateoftheGeneratingStationduringaday

GHR is theGrossHeatRateof theDieselGeneratingUnit in kCal /kWh corrected tosite ambient conditions to take into account the deviations from standard referenceconditionsofISO3046.

AECistheAuxiliaryEnergyConsumption,expressedinpercentage,

ThemonthlyaverageNetHeatRateshallbecalculatedbyweightedaverageasperthefollowingformula.

Sumof(DNHRXNkWh)duringthemonthMNHR=SumofNkWhduringthemonth

WhereMNHRisthemonthlyaverageNetHeatRateinkCal/kWh,

DNHRistheNetHeatRateforadayinkCal/kWh

NkWhisthenetkWhdeliveredattheswitchyardduringtherelevantday

B3.7'OperationandMaintenanceExpenses'or'O&MExpenses'

In relation toaperiod, theexpenditure incurred inoperationandmaintenanceof thegenerating station including manpower, spares, consumables (including water),insuranceandoverheads.

B3.8'PlantLife' AsperGovt.of IndiaGazetteNotificationNo.265(E)dated29thMarch,1994,asamendedfromtimetotime.

B3.9PlantLoadFactor:

B3.9.1'PlantLoadFactor'or'PLF'Inrelationtoanyperiod,theratio,expressedasapercentageof

(a)ThesumoftotalkWhdeliveredattheswitchyardandAuxiliaryEnergyConsumptionasperoperationnorms

to

(b) Installed Capacity, expressed in kilo Watts (kW) multiplied by thenumberofhoursintherelevantperiod,

B3.9.2'DeemedPlantLoadFactor' In relation toanyperiodofoperationof theGeneratingStation,theratioexpressedaspercentage,of

(a)ThesumofavailablecapacitiesforeachSettlementPeriod

to

(b)InstalledcapacitymultipliedbythenumberofSettlementPeriods

B3.10 'Settlement Period' An hour or any other mutually agreed period duringwhichtheavailablecapacityshallbetakenasconstantandequaltoaveragecapacityduringtheperiod.

B3.11'Unit'inrelationto:

DieselEngineGeneratingStation:DieselEngineGeneratorandauxiliaries

B4IncombustionandPostCombustionFlueGasDesulphurisationSystem

B4.1SpecificReagentConsumption

WeightofreagentrequiredinKgperKgofprimaryfuelfiredinthesteamgenerator.

B4.2SulphurDioxideRemovalEfficiency

Ratio of number of moles of SO2 removed in the desulphurisation system to thenumberofmolesofSO2producedinthecombustionprocess,expressedaspercentage.

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