Transmission Deviation charges are payable by regional utilities for deviating by over-injecting or over- drawing power beyond the total approved open access ,ie sum total of Long Term Injection/Drawal Access, Medium Term Injection/Drawal Open Access and Short Term Injection/Drawak Open Access.

2.  Deviation Account
 Reactive Energy (VAR) Account
 Congestion Charge Account
 Regional Energy Account
 Regional Transmission Account
 Regional Transmission Deviation Account

3. REGIONAL TRANSMISSION
DEVIATION ACCOUNT

4.  Approved Injection or Drawal
 Approved Additional Medium Term
Injection or Drawal- MTOA
 Approved Short Term Injection or Drawal-
STOA
 Actual MW Injection or Drawal in a time
block
 Prevalent PoC rate

5. Total Approved Injection in a time block = ( LTOA + MTOA + STOA injection)
= Xi (say)
Total Approved Drawal in a time block = ( LTOA + MTOA + STOA Drawal)=
Xd (say)
INJECTION DEVIATION:
Net MW injection in a time block = Ai (say)
IF Ai > Xi , Total Injection Deviation , Di = Ai – Xi
IF Ai < Xi , Total Injection Deviation , Di = 0
DRAWAL DEVIATION:
Net MW drawal in a time block = Ad (say)
IF Ad > Xd , Total Drawal Deviation , Dd = Ad – Xd
IF Ad < Xd , Total Drawal Deviation , Dd = 0

6. Injection PoC rate = Ri (say)
Withdrawal PoC rate = Rd (say)
INJECTION DEVIATION ( POSITIVE DEVIATION ):
IF Di > 0.2*Xi ,
Transmission Deviation Charges = 0.2*Xi* Ri (Payable by Long term customers)
Additional Deviation Charges = (Di - 0.2*Xi)*1.25*Ri (Payable by Generator)
DRAWAL DEVIATION ( NEGATIVE DEVIATION ):
Dd = Ad – Xd = Ad , Since Xd = 0
Transmission Deviation Charges = 1.25*Ad*Rd (Payable by Generator)

7. Injection PoC rate = Ri (say)
Withdrawal PoC rate = Rd (say)
INJECTION DEVIATION ( POSITIVE DEVIATION ):
IF Di > 0.2*Xi ,
Transmission Deviation Charges = 0.2*Xi* Ri (Payable by Generator)
Additional Deviation Charges = (Di - 0.2*Xi)*1.25*Ri (Payable by
Generator)
DRAWAL DEVIATION ( NEGATIVE DEVIATION ):
Dd = Ad – Xd = Ad , Since Xd = 0
Transmission Deviation Charges = 1.25*Ad*Rd (Payable by Generator)

8. Injection PoC rate = Ri (say)
Withdrawal PoC rate = Rd (say)
DRAWAL DEVIATION ( POSITIVE DEVIATION ):
IF Dd > 0.2*Xd ,
Transmission Deviation Charges = 0.2*Xd * Rd
Additional Deviation Charges = (Dd - 0.2*Xd) * 1.25* Rd
INJECTION DEVIATION ( NEGATIVE DEVIATION ):
Di = Ai – Xi = Ai , Since X = 0
Transmission Deviation Charges = 1.25*Ai*Ri

9. Suppose, in a time block ( for a beneficiary, IPP )
Ai = 150 MW Xi = 120 MW
Injection PoC rate, Ri or = Rs 80 / MW
Total Injection Deviation, Di = (150 – 120 ) = 30 MW
Deviation beyond permitted limit = Di - 0.2Xi= 30-24 = 6 MW
Transmission Deviation Charges = 0.2*Xi*Ri = 24*80 = Rs 1920
Additional Deviation Charges = 1.25*6*80 = Rs 600
Total Deviation Charges = Rs (1920+600)= Rs 2520

10. Ai = 165.41MWH Xi = 538.82 MW = 134.705 MWH
PoC rate, Ri = Rs 197.8 / MWH
Total Injection Deviation, Di =(165.41–134.705)= 30.704 MWH
Deviation beyond permitted limit = Di- 0.2Xi = 30.704-26.941
= 3.763 MWH
Transmission Deviation Charges = 0.2*Xi*Ri = 26.941*197.8
= Rs 5328.93
Additional Deviation Charges = 1.25*3.763*197.8
= Rs 930.40
Total Deviation Charges = Rs 6259.33
Utility/Generator Date Time Block
SESA STERLITE 22.06.2015 17:00 Hrs

11. Ai = 0 MWH, Xi = 622.05 MW = 155.5125 MWH
Ad = 4.1548 MWH , Xd = 0
PoC rate, Ri = Rd = Rs 197.8/ MWH
Total Injection (Positive) Deviation, Di = 0 MWH
Total Drawal (Negative) Deviaiton, Dd = 4.1548 MWH
**Total Deviation Charges = 1.25*Dd* Rd = 1.25*4.1548*197.8
= Rs 1027.28
(** Deviation Charges to be paid by the Generator i,e BARH STPS )
Utility/Generator Date Time Block
BARH 16.06.2015 11:00 Hrs

12. Ai = 130.618 MWH Xi = 503.88 MW = 125.97 MWH
PoC rate, Ri = Rs 222.7/ MWH
Deviation permitted = 0.2*Xi = 0.2* 125.97 = 25.194 MWH
Total Injection Deviation, Di =(130.618–125.97)= 4.648 MWH (which is less than
quantum of deviation permitted without levy of additional charges)
** Transmission Deviation Charges = Di * Ri = 4.648*222.7
= Rs 919.41
(** Deviation Charges to be paid by the beneficiaries of TEESTA V in
proportion to their share in TEESTA V )
Utility/Generator Date Time Block
TEESTA V 25.07.2015 00:45 Hrs

13. DRAWAL LTOA MTOA STOA TOTAL
FSTPP-I & II 203.97
0 171.28
1406.49
KhSTPP- I 116.49
KHSTPP-II 28.98
TSTPP-I 299.72
TSTPP-II 200
FSTPP-III 78.32
TEESTA 103.75
CHUKHA 41.01
TALA 42.92
BARH 91.99
COAL 28.06
TOTAL 1235.21 0 171.28
TOTAL APPROVED DRAWAL, Xd (in MW) 1406.49
APPROVED DRAWAL
Utility/Generator Date Time Block
GRIDCO 28.02.2015 18:15 Hrs

14. APPROVED
INJECTION LTOA MTOA STOA TOTAL
1.82MW
HIRAKUDHPSTO
CHATTISGARH
30MW
JSL(Orissa)toJSL
(Haryana)
1.82MW
HIRAKUDHPSTO
CHATTISGARH
80.63MW
ASFURNISHEDBY
ERLDC
112.45MW
TOTAL APPROVED INJECTION, Xi (in MW) 112.45
APPROVED INJECTION
Utility/Generator Date Time Block
GRIDCO 28.02.2015 18:15 Hrs

15. Utility/Generator Date Time Block
GRIDCO 28.02.2015 18:15 Hrs
Ad = 397.126MWH , Ai = 0
Xd = 1406.49 MW = 351.623 MWH
Xi = 112.45 MW = 28.1125 MWH
PoC rate, Ri = Rs168.9 / MWH , Rd = Rs 148.9 / MWH
Deviation permitted = 0.2Xd = 0.2*351.623 = 70.3245 MWH
Total Drawal Deviation, Dd =(397.126–351.623)= 45.504 MWH (which is less
than quantum of deviation permitted without levy of additional charges)
Total Injection Deviation, Di = 0 MWH
Transmission Deviation Charges = Dd * Rd = 45.504*148.9 = Rs 6775.5

16.  RPC issues the statement by 15th of every
month
 CTU raises the bill on the payable entities within
3 days of issuance of statement by RPC
 CTU collects the transmission deviation
charges and distributes the same to
Transmission licensees
 Application of Transmission charges for infirm
power injection & Start-up power drawal as per
3rd Amendment of PoC Regulation

18.  5.1.(iii) The Charges for the Deviation for the under drawals by the
buyer in a time block in excess of 12% of the schedule or 150 MW,
whichever is less, shall be zero
 Unintended underdrawal due to sudden load crash, increase
in hydro generation or network congestion
 Restoration of system takes time
 Non- acceptance of request for downward revision of schedule
in totality
 7.(3) The Additional Charges for the Deviation for the over drawals
by the buyer in a time block in excess of 12 % of the schedule or
150 MW, whichever is less
 Generation Outage
 Network congestion

19.  The limit of deviation for under drawal and over-injection
as 12% of 150MW if the schedule is less than 150 MW
 Exclusion of liability of ADC during contingency / force
majeure
 Introducing continuous trading in PX
 Initiating requisition based scheduling of hydro generating
stations
 Deferment of implementation of DSM
 Regulations may be made for over drawal in excess of
12% of the schedule or 150 MW, whichever is higher
instead of less for NER states

20.  Large state with a demand of 10000MW
 Integration of Renewables
 Multiple penalization
 Sudden tripping of bigger size units
 Technical minimum constraints

21.  DSM need of the hour
 Helpful in secure operation of grid
 Improvement of freq profile
 Utilities adhering to schedule
 UI volume gone down
 Availability of sufficient avenues
 Grid security and safety of paramount
importance

22.  Contingency plan in advance by DISCOMS
 DSM introduced after grid disturbance of 30th &
31st July, 2012
 Grid freq not the lone parameter for secure grid
operation
 UI not a route for trading
 Freq band gradually tightened in previous UI
regime

23.  Relaxation of Regulation 5.1.iii of DSM- For utilities
having schedule of 400 MW or below, Deviation Charges
shall be receivable as
 for under-drawal upto 48 MW
 for over-injection upto 48 MW
 Relaxation of Regulation 7.3 of DSM- For utilities having
schedule of 400 MW or below, Additional Deviation
Charges shall be payable as
 Additional charges for deviation shall be based on
percentage of deviation worked out with reference to
schedule of 400 MW

24. Actual Injection = 41.9636 MWH
Scheduled Injection = 168 MW = 41.9862 MWH
Deviation = 5.9774 MWH, Freq = 49.92Hz
Rate of Deviation charges = Rs 3447.2
As per previous regulation,
Over injection permitted = 0.12*41.9862 = 5.038 MWH (which is
less than quantum of deviation)
Deviation Charges receivable = Rs 5.038*3447.2
As per amended regulation,
Over injection permitted = 48 MW = 12 MWH (which is more than the
quantum of deviation)
Deviation Charges receivable = Rs 5.9774*3447.2
Utility/Generator Date Time Block
TEESTA V 07.05.2015 14:00 Hrs

25. Actual Injection = 23.3454 MWH
Scheduled Injection = 322 MW = 80.6 MWH
Deviation = 57.254 MWH, Freq = 49.99Hz
Rate of Deviation charges = Rs 1988.4
As per previous regulation,
Under-injection permitted = 0.12*80.6 = 9.672 MWH
Under-injection beyond permitted limit = 57.254 – 9.672 = 47.582 MWH
Additional Deviation Charges payable = Rs 85957.4
Utility/Generator Date Time Block
GMR 20.05.2015 18:45 Hrs
12-15%
3% of Sch*20%
of Dev Rate of
that time block=
0.03*80.6*0.2*19
88.4= Rs961.59
15-20%
5% of Sch*40%
of Dev Rate of
that time block=
0.05*80.6*0.4*19
88.4= Rs3205.3
Above20%
(47.582-8% of
Sch)*100% of
Dev Rate of that
time block=
41.134*1*1988.4
=Rs81790.85

26. Actual Injection = 23.3454 MWH
Scheduled Injection = 322 MW = 80.6 MWH
Deviation = 57.254 MWH, Freq = 49.99Hz
Rate of Deviation charges = Rs 1988.4
As per amended regulation,
Under-injection permitted = 48 MW = 12 MWH
Under-injection beyond permitted limit = 57.254 – 12 = 45.254 MWH
Additional Deviation Charges payable = Rs 79237
Utility/Generator Date Time Block
GMR 20.05.2015 18:45 Hrs
12-15%
3% of 100*20%
of Dev Rate of
that time block=
0.03*100*0.2*198
8.4= Rs1193.04
15-20%
5% of 100*40%
of Dev Rate of
that time block=
0.05*100*0.4*198
8.4= Rs3976.8
Above20%
(45.254-8% of
100)*100% of
Dev Rate of that
time block=
37.254*1*1988.4
=Rs 74067.9