IMPACT OF UNSCHEDULED INTERCHANGE CHARGES AND RELATED MATTERS (AMENDMENT) REGULATIONS, ISSUED BY CERC ON 28.04.2010 APPLICABLE FROM 03.05.2010 IN THE INTRASTATE.

• IMPACT OF UNSCHEDULED INTERCHANGE CHARGES AND

RELATED MATTERS (AMENDMENT) REGULATIONS, ISSUED BY CERC ON

28.04.2010 APPLICABLE FROM 03.05.2010 IN THE INTRASTATE ABT

OPERATION IN DELHI.

Significant Definitions

• actual injection in a time-block means electricity generated or supplied by the generating station or seller, as the case may be, measured by the interface meters

• scheduled generation at any time or for any period or time block means schedule of generation in MW or MWh ex-bus given by the concerned Load Despatch Centre

• time-block means block of 15 minutes, for which specified electrical parameters and quantities are recorded by special energy meter, with first time block starting at 00.00 Hrs

• Unscheduled Interchange in a time-block for a generating station or a seller means its total actual generation minus its total scheduled generation and for a beneficiary or buyer means its total actual drawal minus its total scheduled drawal

• Gaming mean intentional mis-declaration of DC in order to make an undue commercial gain thru UI charges

• Narrowed down operational frequency range for improving the quality of power

Buyer: Means a person, other than the beneficiary, buying electricity, through a transaction scheduled in accordance with the regulations applicable for short term open access, medium term open access and long term access.

Seller: Means a person, other than a generating station, supplying electricity, through a transaction scheduled in accordance with the regulations applicable for short term open access, medium term open access and long term access.

Beneficiary : Means the person purchasing electricity generated from the generating station.

• Permissible operating range has been narrowed down by 0.38 Hz i.e. 49.5 Hz to 50.2 Hz against the previous operating range of 49.22 Hz to 50.3 Hz

• Entities over drawing from the grid below the permissible freq. of 49.5 Hz, to pay an additional UI charge

• Entities under injecting into the grid below the permissible freq. of 49.5 Hz, to pay an additional UI charge

Permissible frequency band operation and Commercial impact for the violations

• UI rates for coal or lignite or APM fuel generators are symmetrical for over generation and under generation

• Injection by generating station other than hydro in excess of 105% of DC in a time block or in excess of 101% of DC not to be construed as gaming

• UI charges and additional UI surcharge rate to be re-notified every six months

• Any surplus amount left in UI pool to be utilized for supporting transmission schemes

• Charges for UI for all the time blocks when grid frequency is between 50.2 Hz and 49.5 Hz-payable for over- drawl by beneficiary or buyer and under injection by generating station or seller

- receivable for under-drawl by the beneficiary or buyer and over-injection by generating station or seller

Determination of UI ratesDetermination of UI ratesBase freq Method Rate adjustment

Below 50.02 Hz and not below 50.0Hz (155 Ps./unit)

Median value of Average Energy charge of Coal/Lignite based Stations for six months period except BTPS of NTPC

Between 50.2 -50.0HzUI price vector to be adjusted in steps of 0.02Hz.

Below 49.70Hz and not below 49.68Hz (403 Ps./Unit)

Providing sufficient incentive to generating station based on coal including imported coal after meeting fixed and energy charge

Between 50.0-49.7Hz UI price vector to be adjusted in steps of 0.02Hz

Base freq Method Adjustment

Below 49.50 Hz(873 Ps./unit)

Highest of average energy charges of generating stations for six months period

Between 49.7-49.5Hz UI price vector to be adjusted in steps of 0.02Hz

UI charges for base freq. shall be re-notified every six months based on relevant escalation indices notified by Commission under Competitive bidding guidelines of GOI

UI Cap RateUI Cap Rate

Category Cap Rate

Generating Stations using coal or lignite or APM gas as fuel

Applicable rate corresponding to freq interval of ‘below 49.70Hz and not below 49.68Hz= 403 Paise/unit

Excess of 105% of DC in a time block and 101% of average DC over a day in the frequency range of below or upto 50.02

Applicable rate corresponding to freq interval of ‘below or upto 50.02Hz is 155 Paise/unit & above it should be as per frequency rate.

Under drawal by beneficiaries in excess of 10% of schedule or 250MW(which ever is less)

Applicable rate corresponding to freq interval of ‘below 49.70Hz and not below 49.68Hz= 403 Paise/unit

• when freq. is below 49.7 Hz • Over-drawl of electricity from schedule by any

beneficiary during a time block shall not exceed 12% of its scheduled drawl or 150MW(which ever is lower), and 3% on a daily aggregate basis

• Under- injection of electricity from schedule by a generating station during a time block shall not exceed 12% of its scheduled injection and 3% on a daily aggregate basis

Additional UI ChargesAdditional UI ChargesFreq Range Category Additional

ChargeBase value

49.50-49.20

Under-Injection 20% 873 Paise/unit–applicable rate at freq. below 49.5 (for beneficiaries and Gas stations where the UI Cap rate is not applicable) and 403 Ps./unit for Coal or Lignite or APM stations- Highest of the average energy charges of the generating stations during last 6 months.

Overdrawal 40%

Below 49.20

Under-Injection 40%

Overdrawal 100%

Net UI Rate for Under InjectionNet UI Rate for Under Injection

Freq. Range (Hz)

Category UI rate (Paise/unit)

Additional UI rate (P/unit)

Net UI rate (P/unit)

49.5-49.2 Coal or Lignite or APM gas Generating Stations

403 80.6 483.60

Other Stations 873 174.60 1047.60

Below 49.2 Coal or Lignite or APM gas Generating Stations

403 161.20 564.20

Other Stations 873 349.20 1222.20

OD /UD LIMITS FOR DISCOM WITH IN DELHI

UTILITY

OD LIMIT IN MW FIXED BY DERC FOR MONITORING PURPOSES FOR THE

FREQUENCY REGIME 49.5Hz – 49.2Hz. In the earlier regulations (DERC order dated

21.04.2009)

UD LIMIT IN MW(in

proportion of OD limits)

BRPL 57 95

NDPL 38 64

BYPL 35 58

NDMC 17 28

MES 3 5

TOTAL 150 250

To drive the UD limit for Discom in term of MW compare to Delhi as a whole under drawing 250 MW ,the same methodology is apply (i.e. in the OD proportion) as adopted by DERC for OD limits of Discom

In consonance with the UI Regulations at Regional level, the Intrastate UI Accounts preparation as under :

• A) Draw out UI accounts at intrastate level by applying inter state UI regulations in TOTO effective from 03.5.10.

• B) Separate out additional UI amounts for overdrawal and under generation. • C) Separate out differential cap amount for underdrawing discoms / over injection

of generators. • D) Draw out the weekly statement of Inter sate UI account issued by NRPC for the

same week for to make Intra State UI account to match with the interstate UI amount.

• E) Settle the Unadjusted Additional UI of Delhi utilities with Additional UI of Delhi as a whole as per NRPC account on daily basis in proportion to additional amount to be paid by the utilities & restrict the additional UI amount of Utilities upto the amount of additional UI charges to be paid by Delhi as a whole as per NRPC account. Since the additional amount to be paid by the intra state utilities would be more than the additional amount to be paid by Delhi, It reduces the accumulation of extra Additional UI amount in the pool account being operated by SLDC.

F) Settle the unadjusted Differential UI _cap Amount (difference of amount calculated on normal UI rate and caped UI rates) of Delhi utilities as per intrastate UI accounts with the Differential UI_cap amount of Delhi as a whole as per NRPC accounts on daily basis. The adjustment of difference of the two (interstate differential amount and intrastate differential amount) is done in 50:50 basis in proportion between paying & receiving utility on pro rata basis.

It reduces the accumulation of extra differential UI cap amount in the pool account and capping is applied only the same is applied to Delhi

G) Settle the unadjusted capped UI Amount of Delhi utilities as per intrastate UI accounts with UI_cap amount of Delhi as a whole as per NRPC accounts on daily basis by adjusting the Difference of two (interstate UI amount and intrastate UI amount) is done in 50:50 basis in proportion between paying & receiving utility on pro rata basis.

H) Make the final statement of Net UI amount of paying/receiving utilities on the daily basis as under:Net UI payable/receivable by Utilities at intrastate level = Additional UI amount (with reference to interstate (para ‘E’) +/- Differential cap Amount (with reference to interstate (para ‘F’) +/- Capped UI amount (with reference to interstate UI account (para ‘G’)

Typical UI account (Week No. 41 (2009-10)) based on the previous slides is as follows:

Intra State UI A/C for Delhi Utilities as per new Regulationall figures are in Rs lacks

Utility→ RPH

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -0.18 -0.11 0.07 0.00

2 0.00 0.00 0.00 0.00

3 0.00 0.00 0.00 0.00

4 0.00 0.00 0.00 0.00

5 0.00 0.00 0.00 0.00

6 0.00 0.00 0.00 0.00

7 0.00 0.00 0.00 0.00

TOTAL -0.18 -0.11 0.07 0.00

Intra State UI A/C for Delhi Utilities as per new Regulationall figures are in Rs lacks

Utility→ IP

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 2.38 2.43 0.05 0.53

2 0.04 0.08 0.04 0.05

3 2.32 2.98 0.66 2.00

4 2.20 3.19 0.99 1.98

5 3.64 3.76 0.13 1.66

6 1.04 1.24 0.21 1.15

7 1.67 2.13 0.46 1.05

TOTAL 13.28 15.81 2.53 8.42

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ GT

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -1.58 -1.58 0.00 0.00

2 -5.63 -5.63 0.00 0.00

3 -10.59 -10.59 0.00 0.00

4 -3.84 -3.84 0.00 0.00

5 -2.97 -2.97 0.00 0.00

6 -7.13 -7.13 0.00 0.00

7 -6.53 -6.53 0.00 0.00

TOTAL -38.27 -38.27 0.00 0.00

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ PPCL

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -12.93 -12.93 0.00 0.01

2 -19.60 -19.60 0.00 0.00

3 -10.91 -10.91 0.00 0.00

4 -6.86 -6.86 0.00 0.00

5 -6.60 -6.60 0.00 0.00

6 -11.39 -11.39 0.00 0.00

7 -9.97 -9.97 0.00 0.00

TOTAL -78.27 -78.27 0.00 0.01

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ BTPS

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -10.49 -6.35 4.14 0.00

2 -26.08 -18.89 7.19 0.00

3 -25.71 -19.71 6.00 0.05

4 -9.70 -4.89 4.81 0.02

5 -13.86 -7.55 6.32 0.05

6 -24.23 -14.03 10.20 0.03

7 -21.37 -12.73 8.64 0.00

TOTAL -131.45 -84.15 47.30 0.14

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ NDPL

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -19.03 -18.51 0.51 2.19

2 0.00 0.00 0.00 0.00

3 -26.96 -24.07 2.90 5.03

4 -61.13 -57.60 3.53 6.12

5 13.77 13.82 0.05 12.01

6 -18.82 -18.67 0.15 10.91

7 -50.27 -40.49 9.78 5.36

TOTAL -162.44 -145.52 16.92 41.62

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ BRPL

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -41.06 -40.95 0.12 2.26

2 2.80 3.13 0.33 15.43

3 20.37 21.19 0.82 20.04

4 10.15 10.15 0.00 12.25

5 4.14 4.14 0.00 11.16

6 -27.31 -27.12 0.19 9.79

7 -42.49 -40.17 2.31 10.30

TOTAL -73.40 -69.62 3.78 81.23

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ BYPL

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -6.41 -6.41 0.00 0.87

2 -20.22 -19.26 0.96 3.91

3 -22.57 -20.65 1.92 5.25

4 0.16 1.27 1.11 9.92

5 20.91 20.91 0.00 12.02

6 -5.23 -4.76 0.47 4.70

7 -20.20 -17.39 2.81 4.29

TOTAL -53.55 -46.29 7.26 40.95

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ NDMC

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -50.03 -39.95 10.09 0.01

2 -115.89 -79.98 35.91 0.05

3 -118.44 -82.38 36.06 0.04

4 -98.66 -70.37 28.29 0.09

5 -33.61 -29.83 3.78 0.22

6 -117.48 -83.25 34.22 0.15

7 -108.30 -79.78 28.52 0.08

TOTAL -642.41 -465.54 176.87 0.64

Intra State UI A/C for Delhi Utilities as per new Regulation

all figures are in Rs lacks

Utility→ MES

Date↓ UI Amount UI Amount Diffrential_cap additional

  without Cap with cap amount UI amount

1 -3.31 -2.85 0.46 0.00

2 -9.22 -6.99 2.24 0.00

3 -9.30 -7.16 2.14 0.00

4 -8.60 -6.74 1.85 0.00

5 -2.75 -2.63 0.11 0.00

6 -9.19 -7.01 2.18 0.00

7 -7.37 -6.07 1.30 0.00

TOTAL -49.74 -39.45 10.28 0.00

UI Account for Delhi AS PER NRPC W.E.F 03.05.10

DateScheduled

toActual

Drawal OD(+ive)/UD(-ive)

Adj UI amount

Additional UI amount Differential Net UI

  Delhi in MUsof Delhi in

MUs in MUs in Rs Lakhs in Rs Lakhs Cap AmountAmount in rs

lacs

1 37 33 -5 -120 20 1 -99

2 37 33 -4 -158 10 5 -143

3 38 34 -4 -161 5 8 -148

4 38 34 -4 -133 0 9 -124

5 39 36 -3 -26 2 2 -22

6 38 33 -5 -182 6 2 -174

7 38 32 -6 -221 1 0 -220

 Total 266 235 -31 -1001 44 27 -930

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

1. Additional UI amount a) As per UI Regulations all figures are in Rs lacs

UTILITIES 1 2 3 4 5 6 7 Total

IP 0.53 0.05 2.00 1.98 1.66 1.15 1.05 8.42

RPH 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

GT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PPCL 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01

BTPS 0.00 0.00 0.05 0.02 0.05 0.03 0.00 0.14

NDPL 2.19 0.00 5.03 6.12 12.01 10.91 5.36 41.62

BRPL 2.26 15.43 20.04 12.25 11.16 9.79 10.30 81.23

BYPL 0.87 3.91 5.25 9.92 12.02 4.70 4.29 40.95

NDMC 0.01 0.05 0.04 0.09 0.22 0.15 0.08 0.64

MES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL 5.86 19.44 32.41 30.39 37.11 26.74 21.07 173.02

Additional UI for Delhi(as per interstate 20 10 5 0 2 6 1 44.00

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

1. Additional UI amount b) Adjustment as per Para ‘E’ all figures are in Rs lacs

UTILITIES 1 2 3 4 5 6 7 Total

IP 1.82 0.02 0.31 0.00 0.09 0.26 0.05 2.55

RPH 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

GT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PPCL 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.03

BTPS 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.02

NDPL 7.46 0.00 0.78 0.00 0.65 2.45 0.25 11.59

BRPL 7.71 7.94 3.09 0.00 0.60 2.20 0.49 22.02

BYPL 2.95 2.01 0.81 0.00 0.65 1.06 0.20 7.68

NDMC 0.03 0.03 0.01 0.00 0.01 0.03 0.00 0.11

MES 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

TOTAL 20.00 10.00 5.00 0.00 2.00 6.00 1.00 44.00

Additional UI for Delhi 20 10 5 0 2 6 1 44.00

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

2. Differential Cap Amounta) As per UI Regulations all figures are in Rs lacs

UTILITIESD 1 2 3 4 5 6 7 Total

IP 0.05 0.04 0.66 0.99 0.13 0.21 0.46 2.53

RPH 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.07

GT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PPCL 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

BTPS 4.14 7.19 6.00 4.81 6.32 10.20 8.64 47.30

NDPL 0.51 0.00 2.90 3.53 0.05 0.15 9.78 16.92

BRPL 0.12 0.33 0.82 0.00 0.00 0.19 2.31 3.78

BYPL 0.00 0.96 1.92 1.11 0.00 0.47 2.81 7.26

NDMC 10.09 35.91 36.06 28.29 3.78 34.22 28.52 176.87MES 0.46 2.24 2.14 1.85 0.11 2.18 1.30 10.28

TOTAL 15.44 46.66 50.49 40.59 10.38 47.63 53.83 265.02Diff_Cap Amount for Delhi 1 5 8 9 2 2 0 27

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

UTILITIES 1 2 3 4 5 6 7 Total

IP 0.00 0.02 0.10 0.22 0.02 0.01 0.00 0.38

RPH 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

GT 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

PPCL 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

BTPS 0.27 0.77 0.95 1.07 1.22 0.43 0.00 4.70

NDPL 0.03 0.00 0.46 0.78 0.01 0.01 0.00 1.29

BRPL 0.01 0.04 0.13 0.00 0.00 0.01 0.00 0.18

BYPL 0.00 0.10 0.30 0.25 0.00 0.02 0.00 0.67

NDMC 0.65 3.85 5.71 6.27 0.73 1.44 0.00 18.65

MES 0.03 0.24 0.34 0.41 0.02 0.09 0.00 1.13

TOTAL 1.00 5.02 8.00 9.00 2.00 2.00 0.00 27.0Diff_Cap Amount for Delhi 1 5 8 9 2 2 0 27

2. Differential Cap Amounta) Adjusted as per para ‘F’ of previous slides all figures are in Rs lacs

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

UTILITIES 1 2 3 4 5 6 7 Total

IP 2.43 0.08 2.98 3.19 3.76 1.24 2.13 15.81

RPH -0.11 0.00 0.00 0.00 0.00 0.00 0.00 -0.11

GT -1.58 -5.63 -10.59 -3.84 -2.97 -7.13 -6.53 -38.27

PPCL -12.93 -19.60 -10.91 -6.86 -6.60 -11.39 -9.97 -78.27

BTPS -6.35 -18.89 -19.71 -4.89 -7.55 -14.03 -12.73 -84.15

NDPL -18.51 0.00 -24.07 -57.60 13.82 -18.67 -40.49 -145.52

BRPL -40.95 3.13 21.19 10.15 4.14 -27.12 -40.17 -69.62

BYPL -6.41 -19.26 -20.65 1.27 20.91 -4.76 -17.39 -46.29

NDMC -39.95 -79.98 -82.38 -70.37 -29.83 -83.25 -79.78 -465.54

MES -2.85 -6.99 -7.16 -6.74 -2.63 -7.01 -6.07 -39.45

TOTAL -127.22 -147.14 -151.29 -135.70 -6.95 -172.11 -211.01 -951.41Net UI Amount for Delhi -99.22 -142.76 -148.37 -124.21 -21.52 -173.66 -220.39 -930.13

3. UI Amount for Utilities a) As per intrastate accounts all figures are in Rs lacs

Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter State UI account

UTILITIES 1 2 3 4 5 6 7 Total

IP 16.42 0.13 3.16 4.45 3.12 0.47 -2.56 25.19

RPH -0.10 0.00 0.00 0.00 0.00 0.00 0.00 -0.10

GT -1.41 -5.55 -10.50 -3.70 -3.41 -7.16 -6.68 -38.40

PPCL -11.54 -19.32 -10.81 -6.60 -7.57 -11.44 -10.19 -77.48

BTPS -5.67 -18.62 -19.55 -4.70 -8.65 -14.09 -13.01 -84.29

NDPL -16.52 0.00 -23.87 -55.39 11.46 -18.75 -41.38 -144.45

BRPL -36.53 5.27 22.47 14.14 3.43 -27.24 -41.06 -59.51

BYPL -5.71 -18.98 -20.48 1.76 17.34 -4.78 -17.77 -48.62

NDMC -35.63 -78.81 -81.70 -67.68 -34.21 -83.63 -81.54 -463.20

MES -2.55 -6.89 -7.10 -6.48 -3.02 -7.04 -6.21 -39.28

TOTAL -99.22 -142.76 -148.37 -124.21 -21.52 -173.66 -220.39 -930.13

Net UI Amount for Delhi

-99.22 -142.76 -148.37 -124.21 -21.52 -173.66 -220.39 -930.13

3. UI amount matching with the Interstate UI account a) As per para ‘G’ all figures are in Rs lacs

Net UI payable/receivable by Utilities at intrastate level = Additional UI amount (with reference to interstate (para ‘E’) +/- Differential cap Amount

(with reference to interstate (para ‘F’) +/- Capped UI amount (with reference to interstate UI account (para ‘G’)

all fig in Rs LacksUtility Name Receivable Payable

IP 0 28.10

RPH 0.10

GT 38.40

PPCL 77.45

BTPS 79.57

NDPL 131.57

BRPL 37.30

BYPL 40.27

NDMC 444.43

MES 38.15POOL BALANCE DUE TO

ADDITIONAL UI 44.00POOL BALANCE DUE TO

DIFF_CAP AMOUNT 27.00NRPC

930.13

Total 958 958

IPGCL-PPCL 37