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8/12/2019 Deviation Settlement
1/29
CERC (Deviation Settlement
Mechanism and related matters),
Effective from 17.02.2014
2/10/2014 1ERPC, KOLKATA
8/12/2019 Deviation Settlement
2/29
Replacement of existing UI Regulations which is
effective since 17.09.12
Objective:
Discourage deviation from Schedule
Operate within the freq band
Ensure grid security
Important Changes vis--vis Existing UI regulation:
Buyer/Seller Rate vector:
2/10/2014 2ERPC, KOLKATA
8/12/2019 Deviation Settlement
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SL No EXISTING UI RATE
1 f>=50.20Hz, RUI=0
2 50.20>f>=50.00, RUI increases by 16.5 p/u for each 0.02Hz step
3 50.00>f>=49.8,RUI increases by 28.50 p/u for each 0.02Hz step4 49.8>f>=49.50, RUI increases by 28.12 p/u for each 0.02Hz step
5 f
8/12/2019 Deviation Settlement
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SL No NEW RATE FOR DEVIATION CHARGE
1 f>=50.05Hz, RDC=0
2 50.05>f>=50.00, RDC increases by 35.6 p/u for each 0.01Hz step
3 50.00>f>=49.7, RDC increases by 20.84 p/u for each 0.01Hz step
4 f
8/12/2019 Deviation Settlement
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BUYERs/SELLERs
1. Overinjection/Underdrawal:
Charges for Deviation receivable foroverinjection/underdrawal in a time block withinthe volume capping of 12% of Schedule or 150MWwhichever is less in normal Deviation Chargedepending on freq.
For any overinjection/underdrawal beyond thevolume capping limit in a time block, the charges
receivable is zero. Additional Charges for Deviation for
overinjection/underdrawal in any time block whenf>=50.10Hz at 178 p/u
2/10/2014 5ERPC, KOLKATA
8/12/2019 Deviation Settlement
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2. Overdrawal/Underinjection:
A. Charges for Deviation payable for
overdrawal/underinjection in a time block in normalDeviation Charge depending on freq.
B. Additional charges for Deviation levied for
overdrawal/underinjection beyond the volume capping
limit as follows:---- .
a. 12% of Sch in a time block < = 150 MW
Overdrawal/
Underinjection
12-15% 15-20% Above 20%
Additional Charges for
Deviation
20 % of Normal
Deviation Charge
depending on
average freq of that
block
40 % of Normal
Deviation Charge
depending on
average freq of that
block
100 % of Normal
Deviation Charge
depending on
average freq of that
block
2/10/2014 6ERPC, KOLKATA
8/12/2019 Deviation Settlement
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b) 12% of Sch in a time block > 150 MW
Overdrawal/
Underinjection
150-200MW 200-250MW Above 250MW
Additional Charges
for Deviation
20 % of Normal
Deviation Charge
depending on
average freq of
that block
40 % of Normal
Deviation Charge
depending on
average freq of
that block
100 % of Normal
Deviation Charge
depending on
average freq of that
block
This is a new provision added to this regulation.
Freq ---- Below 49.7 Hz
Additonal Charges levied = 2*824.04 p/u
= 1648.08 p/u
2/10/2014 7ERPC, KOLKATA
8/12/2019 Deviation Settlement
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ILLUSTRATION:
Buyer/Seller : Underdrawal/Overinjection:
Sch Act Dev Freq Dev Rate Min
(12% of
Col2,15
0)
Dev Charge
Receivable
Quantum of
Deviation for
Addl Dev
Charge
Additional
Dev
Charge
Payable
1 1450 1480 30 49.9 407.24 150 30*407.24 0 0
2 1450 1680 230 50 178 150 150*178 0 0
3 1200 1380 180 49.96 261.36 144 144*261.36 0 0
4 1300 1350 50 50.12 0 150 0 50 50*178
5 -120 -100 20 49.9 407.24 14.4 14.4*407.24 0 0
6 -1300 -1210 90 50 178 150 90*178 0 0
7 -1300 -1140 160 49.96 261.36 150 150*261.36 0 0
8 -1150 -1010 140 49.84 511.44 138 138*511.44 0 0
9 -300 -240 60 50.18 0 36 0 60 60*1782/10/2014 8ERPC, KOLKATA
8/12/2019 Deviation Settlement
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Sch Act Dev Freq Dev Rate Min
(12%of
Col2,
150)
Dev Charge
Payable
Quantum of
Deviation forAddl Dev
Charge
Additional Dev
Charge Payable
1 1450 1420 -30 49.9 407.24 150 30*303.04 0 0
2 1450 1190 -260 49.8 594.8 150 260*594.8 110 50*0.2*594.8+50*0.4*594.8+10*594.8
Buyer/Seller: Overdrawal/Underinjection:
3 1180 940 -240 49.75 678.16 141.6 240*678.16 98.4 35.4*0.2*678.16+59*
0.4*678.16+4*678.16
4 1180 1150 -30 49.68 824.04 141.6 30*824.04 30 30*824.04
5 -400 -435 -35 50.01 142.40 48 35*142.4 0 0
6 -400 -485 -85 49.86 469.76 48 85*469.76 37 12*0.2*469.76+20*0.
4*469.76+5*469.76
7 -1400 -1665 -265 49.91 365.56 150 265*365.56 115 50*0.2*365.56+50+0.
4*365.56+15+365.56
8 -250 -282 -32 49.61 824.04 30 32*824.04 32 32*824.04
2/10/2014 9ERPC, KOLKATA
8/12/2019 Deviation Settlement
10/29
In a time block: Sch injection = 1450MW Act injection= 1190MW
Deviation =1190-1450 = -260MW
Freq = 49.8 Hz, Dev Rate = 594.80 paisa/unit
Min ( 12% of Sch=174MW, 150MW) = 150MW
Total underinj allowed without levy of Addl Charge for Deviation = 150MW
Quantum of Underinjection on which Addl Charges for Deviation to be
levied = 260-150 = 110 MW
150-200MW
(200-150)*20% ofDev Rate of thattime block=50*0.2*594.8
paisa/unit 200-250MW
(250-200)*40% ofDev Rate of thattime block=50*0.4*594.8
paisa/unitAbo
ve250MW(110-50-
50)*100% ofDev Rate ofthat time
block=10*1*594.8paisa/unit
2/10/2014 10ERPC, KOLKATA
8/12/2019 Deviation Settlement
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In a time block: Sch Drawal = -400MW Act Drawal= -485MW
Deviation = -485-(-400)= -85MW
Freq = 49.86 Hz, Dev Rate = 469.76 paisa/unit
Min ( 12% of Sch=48MW, 150MW) = 48MW
Total overdrawal allowed without levy of Addl Charge for Deviation = 48MW
Quantum of Overdrawal on which Addl Charges for Deviation to be levied =
85-48 = 37 MW
12
-15%
3% of Sch*20%of Dev Rate ofthat time block=
12*0.2*469.76paisa/unit 15
-20%
5% of Sch*40%of Dev Rate ofthat time block=
20*0.4*469.76paisa/unit A
bove20%(37-8% of
Sch)*100% ofDev Rate of that
time block=5*1*469.76paisa/unit
2/10/2014 11ERPC, KOLKATA
8/12/2019 Deviation Settlement
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300
350
400
450
Existing UI Rate (paise/unit)
Maximum UI Rate
= 421.5 p/u
Thermal Stations regulated by CERC and using coal
under APM as fuel):
0
50
100
150
200
250
50.3
50.26
50.22
50.18
50.14
50.1
50.06
50.02
49.98
49.94
49.9
49.86
49.82
49.78
49.74
49.7
49.66
49.62
49.58
49.54
49.5
Existing UI Rate
(paise/unit)165 p/u at 50Hz
2/10/2014 12ERPC, KOLKATA
8/12/2019 Deviation Settlement
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250
300
350
Rate for Deviation Charge ( paise/unit )
Maximum Deviation Rate
= 303.04 paise/unit
Thermal Stations regulated by CERC and using coal
under APM as fuel:
0
50
100
150
200
50.2
50.15
50.1
50.05
50
49.95
49.9
49.85
49.8
49.75
49.7
49.65
49.6
49.55
Rate for Deviation
Charge ( paise/unit )
178 paise/unit at 50 Hz
2/10/2014 13ERPC, KOLKATA
8/12/2019 Deviation Settlement
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8/12/2019 Deviation Settlement
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3. Underinjection:
A. Charges for Deviation payable for underinjection
in a time block in normal Deviation Chargesubject to a capping of 303.04p/u depending onfreq.
B. Additional charges for Deviation levied for
underinjection beyond the volume capping limitas follows:
Freq ---- 49.7 Hz and above
a. 12% of Sch in a time block < = 150 MW
Underinjection 12-15% 15-20% Above 20%Additional Charges
for Deviation
20 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
40 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
100 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
2/10/2014 15ERPC, KOLKATA
8/12/2019 Deviation Settlement
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b) 12% of Sch in a time block > 150 MW
Underinjection 150-200MW 200-250MW Above 250MW
Additional Charges
for Deviation
20 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
40 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
100 % of
MIN(303.04p/u ,
Normal Deviation
Charge)
This is a new provision added to this regulation.
Freq ---- Below 49.7 Hz
Additonal Charges levied = 2*303.04 p/u
= 606.08 p/u
2/10/2014 16ERPC, KOLKATA
8/12/2019 Deviation Settlement
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ILLUSTRATION:
1) Overinjection
Sch Act Dev Freq Dev Rate Dev
Rate
Applic
-able
Min (12% of
Col2,150)
Dev Charge
Receivable
Additio
nal Dev
Charge
Payable
1 1450 1480 30 49.9 407.24 303.04 150 30*303.04 0
2 1450 1680 230 50 178 178 150 150*178 0
3 1200 1380 180 49.96 261.36 261.36 144 144*261.36 0
4 1300 1350 50 50.12 0 178 0 50*178
2/10/2014 17ERPC, KOLKATA
8/12/2019 Deviation Settlement
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Sch Act Dev Freq Dev Rate Dev
RateApplic-
able
Min
(12% ofCol2,15
0)
Dev Charge
Payable
Additional Dev Charge
Payable
1 1450 1420 -30 49.9 407.24 303.04 150 30*303.04 0
2 1450 1280 -170 50 178 178 150 170*178 20*.2*178
3 1450 1240 -210 49.96 261.36 261.36 150 210*261.36 50*0.2*261.36+10*0.4
*261.36
* * * *
UNDERINJECTION
- . . . . . . .
*303.04+10*303.04
5 1180 1150 -30 49.75 678.16 303.04 141.6 30*303.04 0
6 1180 1000 -180 49.98 219.68 219.68 141.6 180*219.68 35.4*0.2*219.68+3*0.4
*219.68
7 1180 940 -240 49.88 428.08 303.04 141.6 240*303.04 35.4*0.2*303.04+59*0.4*303.04+4*303.04
8 1180 1075 -105 49.70 803.2 303.04 141.6 105*303.04 0
9 1180 1075 -105 49.69 803.2 303.04 141.6 105*303.04 105*303.04
2/10/2014 18ERPC, KOLKATA
8/12/2019 Deviation Settlement
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In a time block: Sch injection = 1450MW Act injection= 1190MW
Deviation =1190-1450 = -260MW
Freq = 49.8 Hz, Dev Rate = 594.80 paise/unit
Dev Rate applicable = MIN( Normal Dev Rate, 303.04)=303.04 paise/unit
Min ( 12% of Sch=174MW, 150MW) = 150MW
Total underinj allowed without levy of Addl Charge for Deviation = 150MW
Quantum of Underinjection on which Addl Charges for Deviation to be
levied = 260-150 = 110 MW
150-200MW
(200-150)*20% ofMIN(Normal DevRate of that time
block,303.04)=50*0.2*303.04paisa/unit 2
00-250MW
(250-200)*40% ofMIN(Normal DevRate of that time
block,303.04)=50*0.4*303.04paisa/unit
Above250MW(110-50-
50)*100% ofMIN(Normal
Dev Rate ofthat timeblock,303.04)=10*1*303.04paisa/unit
2/10/2014 19ERPC, KOLKATA
8/12/2019 Deviation Settlement
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In a time block: Sch injection = 1180MW Act injection= 940MW
Deviation = 940-1180 = -240MW
Freq = 49.88 Hz, Dev Rate = 428.08 paisa/unit
Dev Rate applicable = MIN( Normal Dev Rate, 303.04)=303.04 paise/unit
Min ( 12% of Sch=141.6MW, 150MW) = 141.6MW
Total underinj allowed without levy of Addl Charge for Deviation = 141.6MW
Quantum of Underinjection on which Addl Charges for Deviation to be
levied = 240-141.6 = 98.4 MW
12
-15%
3% of Sch*20%MIN(Normal DevRate of that timeblock,303.04)=
35.4*0.2*303.04paisa/unit
15
-20%
5% of Sch*40%MIN(Normal DevRate of that timeblock,303.04)=
59*0.4*303.04paisa/unit A
bove20%(98.4-8%of
Sch)*100%MIN(Normal DevRate of that time
block,303.04)=4*1*303.04paisa/unit
2/10/2014 20ERPC, KOLKATA
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Infirm power:
1. Injection:
Period of 6 months allowed
Domestic coal/lignite/hydro: 178p/u against 165 p/u
Imported coal: 303p/u against 330p/u
Exemption from volume limit
2. Drawal:
Exemption from volume limit for f>=49.7Hz
No levy of Additional charges for deviation at f
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Accounting of Charges for Deviation:
RLDCs to furnish data by every Thursday
RPCs to prepare and issue statement of Deviation including Additional Charges for
Deviation b ever Tuesda for 7 da eriodending on penultimate Sunday.
All payments including interest , if any, to becredited to Regional Deviation Pool AccountFund
Fund to be operated and maintained by RLDCs
2/10/2014 22ERPC, KOLKATA
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Other Important Clauses:
Any Additional Charge for Deviation collected from aregional entity shall be retained in the RegionalDeviation Pool Account Fund of the concerned regionwhere the regional entity is located
In the event of sustained deviation from schedule in
one direction (positive or negative) by any regional,
to make sign of their deviation from schedule changed,at least once, after every 12 time blocks. To illustrate, ifa regional entity has positive deviation from schedule
from 07.30 hrs to 10.30 hrs, sign of its deviation fromschedule shall be changed in the 13th time block i.e.10.30 to 10.45 hrs from positive to negative or negativeto positive as the case may be.
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Other Important Clauses: (contd.)
RLDCs shall, on monthly basis, prepare and publish on
its website the records of the DeviationAccounts, specifying the quantum of over-drawl/under-injection and corresponding amount of Chargesfor Deviation payable/receivable for each buyer andseller for all the time-blocks when grid frequency was
"49.90Hz and above" and "below 49.90" Hz separately. ny surp us amoun n e ev a on oo ccoun un
on the last day of the month shall be transferred toPSDF in first week of the next month
On commencement of these regulations:
a) CERC (UI & related matters) regulation shall standrepealed
b) Regional UI Pool Account Fund shall continue tooperate till the UI Accounts settlement is completed
2/10/2014 24ERPC, KOLKATA
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Schedule of Payments: Payment to be made within 10 days of issue of statement by RPC
For delay of more than 2 days i.e beyond 12 days of issue of statement byRPC, simple interest @ 0.04% to be levied for each day of delay
Payments to receivable entities to be made within 2 working days of receipt of payments in the fund
In the event of delay of payment by Payable entities, the receivable entitiesshall be paid from the balance in the fund. If sufficient fund not
there, payment to be made on pro rata basis Utilities defaultin at an time in revious FY shall o en an LC e ual to
110% of its average payable weekly liability in favour of the concernedRLDC within a fortnight of date these regulations come into force
Utilities defaulting at any time in current FY shall open an LC equal to 110%of its weekly outstanding liability in favour of the concerned RLDC within afortnight from the due date of payment
LC to be increased to 110% of the payable weekly liability for Deviation inany week during the year, if it exceeds the previous LC amount by morethan 50%
For payments not received within 12 days, RLDC entitled to encash the LCto the extent of default which has be recouped within 3 days
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Relevant Clauses from IEGC , 2nd Amendment
Regulations effective from 17.02.2014
Clause 3(7)(g):RLDCs shall devise standard instantaneous message formatsin order to give directions in case of contingencies and/or threat to thesystem security to reduce deviation from schedule by the bulkconsumer, SLDC/StateUtility/ISGS/Regional Entity/Injeecting Utility atdifferent overdrawal/underdrawal/over-injection/underinjection conditionsdepending upon the severity. The concerned SLDC/other regional entityshall ensure immediate compliance with these directions of RLDC and senda compliance report to the concerned RLDC
Clause 4(1): ..The regional entities shall regulate their generationand/or consumers load so as to maintain their actual drawl from theregional grid close to the above schedule. Maximum inadvertent deviationallowed during a time block shall not exceed the limits specified in the
Deviation Settlement Mechanism Regulations. Such deviations should notcause system parameters to deteriorate beyond permissible limits andshould not lead to unacceptable line loadings. Inadvertent deviations, ifany, from net drawl schedule shall be priced through the DeviationSettlement mechanism as specified by the Central Commission from time totime. Every regional entity shall ensure reversal of sign of deviation fromschedule at least once after every twelve time blocks
2/10/2014 26ERPC, KOLKATA
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Relevant Clauses from IEGC , 2nd Amendment
Regulations effective from 17.02.2014 (contd)
Clause 4(2)(7): The SLDC, SEB / distribution licensee shall always restrict the netdrawl of the state from the grid within the drawl schedule keeping the deviationsfrom the schedule within the limits specified in the Deviation SettlementMechanism Regulations. The concerned SEB/distribution licensee/User, SLDC shallensure that their automatic demand management scheme mentioned in clause5.4.2 acts to ensure that there is no over-drawl. If the automatic demandmanagement scheme has not yet been commissioned, then action shall be taken as
per manual demand management scheme to restrict the net drawal from grid towithin schedules and all actions for early commissioning of Automatic Demandanagemen c eme s a e n a e
Clause 4(3)(10): The ISGS is normally expected to generate power according to thedaily schedules advised to them barring any inadvertent deviations. Maximumdeviation allowed during a time block shall not exceed the limits specified in theDeviation Settlement Mechanism Regulations. Such deviations should not cause
system parameters to deteriorate beyond permissible limits and should not lead tounacceptable line loadings. Inadvertent deviations, if any, from the ex-power plantgeneration schedules shall be appropriately priced in accordance with DeviationSettlement Mechanism Regulations. In addition, deviations from schedules causingcongestion, shall also be priced in accordance with the Central Electricity RegulatoryCommission (Measure to relieve congestion in real time operation)Regulations, 2009
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Relevant Clauses from IEGC , 2nd Amendment
Regulations effective from 17.02.2014 (contd)
Clause 4(5)(12): .. the RLDC may direct the SLDCs/ISGS/
other regional entities to increase/decrease their
drawal/generation in case of contingencies e.g. overloading of
lines/transformers, abnormal voltages,threat to system
security. Such directions shall immediately be acted upon.,
RLDC has some time for analysis, it shall be checked whether
the situation has arisen due to deviations from schedules.
Clause 4(7)(24): "Hydro generating stations are expected to
respond to grid frequency changes and inflow fluctuations.
Maximum deviation allowed during a time block shall be as per
the CERC Deviation Settlement Mechanism Regulations."
2/10/2014 28ERPC, KOLKATA
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2/10/2014 29ERPC, KOLKATA