• 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 frequency band operation
and Commercial impact for the violations
• 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
• 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 renotified 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 rates
Base freq
Method
Rate adjustment
Below 50.02 Hz and
not below 50.0Hz
(155 Ps./unit)
Median value of Average Between 50.2 -50.0Hz
Energy charge of
UI price vector to be
Coal/Lignite based
adjusted in steps of 0.02Hz.
Stations for six months
period except BTPS of
NTPC
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 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 Charges
Freq Range
Category
Additional
Charge
Base value
49.5049.20
Under-Injection
20%
Overdrawal
40%
Under-Injection
40%
Overdrawal
100%
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.
Below
49.20
Net 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
Coal or Lignite or APM gas
Generating Stations
403
161.20
564.20
Other Stations
873
349.20
1222.20
Below 49.2
OD /UD LIMITS FOR DISCOM WITH IN DELHI
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
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
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 Regulation
all 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 Regulation
all 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
Date
Scheduled
to
Actual
Drawal
of Delhi in
Delhi in MUs
MUs
OD(+ive)/U
D(-ive)
in MUs
Adj UI
amount
Additional UI
amount
Differential
Net UI
Amount in rs
in Rs Lakhs in Rs Lakhs Cap Amount
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 Amount
a) As per UI Regulations
all figures are in Rs lacs
UTILITIES
D
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
MES
10.09
0.46
35.91
2.24
36.06
2.14
28.29
1.85
3.78
0.11
34.22
2.18
28.52
1.30
176.87
10.28
TOTAL
Diff_Cap
Amount for
Delhi
15.44
46.66
50.49
40.59
10.38
47.63
53.83
265.02
1
5
8
9
2
2
0
27
Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter
State UI account
2. Differential Cap Amount
a) Adjusted as per para ‘F’ of previous slides
all figures are in Rs lacs
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
1.00
5.02
8.00
9.00
2.00
2.00
0.00
27.0
1
5
8
9
2
2
0
27
TOTAL
Diff_Cap
Amount
for Delhi
Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter
State UI account
3. UI Amount for Utilities
a) As per intrastate accounts
all figures are in Rs lacs
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
-127.22
-147.14
-151.29
-135.70
-6.95
-172.11
-211.01
-951.41
-99.22
-142.76
-148.37
-124.21
-21.52
-173.66
-220.39
TOTAL
Net UI
Amount
for Delhi
-930.13
Methodology for settlement of Intra State UI a/c for Delhi Utilities & Inter
State UI account
3. UI amount matching with the Interstate UI account
a) As per para ‘G’
all figures are in Rs lacs
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
-99.22
-142.76
-148.37
-124.21
-21.52
-173.66
-220.39
-930.13
-99.22
-142.76
-148.37
-124.21
-21.52
-173.66
-220.39
-930.13
TOTAL
Net UI
Amount
for Delhi
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 Lacks
Utility Name
Receivable
Payable
IP
0
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
POOL BALANCE DUE TO
ADDITIONAL UI
POOL BALANCE DUE TO
DIFF_CAP AMOUNT
NRPC
38.15
Total
958
28.10
44.00
27.00
930.13
958
IPGCL-PPCL
37