Rajasthan Interstate ABT

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A Presentation on

INTRA – STATE
AVAILABILITY BASED TARIFF
(ABT)

1
Why Intra – State ABT

• Intra-state ABT is a techno-economic
tool for bringing rational tariff structure
for supply of electricity from State
generators to the distribution Licensees.

• It is a mechanism for enforcing discipline
in the Grid.

2
Benefits of Intra – State ABT

a) Benefits to the Power System
• Brings about grid discipline by maintaining
frequency in prescribed band (49.5 to 50.5 Hz).

• Ensures optimum utilization of available
generation capacities.
• Enhances opportunities for Open access,
and Trading of electricity.
• Scope for encouraging competition among
generators.

3
b) Benefits to the Generator
• Encourages maximization of Generation during
peak hours with incentives and discourages the
same during off-peak hours with penalties linked
with frequency.
• Enables systematic scheduling in terms of long
term, short term as well as day ahead, duly
considering plant availability and maintenance.
• Ensures better life of equipments due to efficient
management of Demand Vs Supply. Thereby the
‘Hidden Costs’ due to damage is avoided.
• The three-part Tariff under ABT provides for
proper recovery of fixed and variable costs of
Generator. 4
c) Benefits to the Distribution Licensees
• Economic efficiency dictates that the least
cost power should be dispatched in
preference to costly power (Merit Order
Dispatch). ABT provides for the same.

• Licensees can plan their requirement, both
for peak and off peak demands.

• Enables efficient Load Management through
their own Area Load Dispatch Centers.

5
d) Benefits to the End Users

• Enables open access, captive generation and
trading of electricity.

• Ensures quality and reliable power supply.

• Scope for reduction in cost of power due to
licensees opting for merit order dispatch in their
scheduling.

6
CONSTITUENTS OF
INTRA-STATE ABT in
RAJASTHAN

1. JVVNL
2. AVVNL
3. JdVVNL
4. RVUN

7
ABT BILLING METHODOLOGY
ABT is, basically, a three part tariff system consisting of
the following components :-

• Fixed charges – on monthly basis subject to
adjustment on yearly basis.

• Variable charges - on monthly basis.

• Unscheduled inter-change (UI) charges. – on
weekly basis.

8
UNSCHEDULED INTER-CHANGE
(UI) CHARGES
• The UI for a Generating Station shall be equal to its actual
generation minus its scheduled generation. UI for States
shall be equal to its total actual drawal minus its total
scheduled drawal.
• UI shall be worked out for each 15 minutes time block.
Charges for all UI transactions are based on average
frequency of the time block.
• The UI Tariff structure w.e.f., 07/01/2008 is as under.

Average Frequency of time-block UI Rate (P/kWh)
---------------------------------------- -----------------------------------
50.5 Hz and above 0.00
Below 50.50 Hz and upto 50.48 Hz 8.00
Below 49.82 Hz and upto 49.80 Hz 280.00
Below 49.04 Hz and upto 49.02 Hz 982.00
Below 49.02 Hz 1000.00
Between 50.50 Hz and 49.80 Hz Linear in 0.02 Hz steps
@ 8 P/kWh for each step
Below 49.80 Hz Linear in 0.02 Hz steps
@ 18P/kWh for each step 9
INTRA-STATE UI RATE

UIS = UIR / (1-L)
Where,

UIS is Intra State ABT rate for a frequency step
UIR is UI rate applicable for Northern Region for that frequency step
L is the Inter-State transmission losses of NR in per unit

10
UI SETTLEMENT MECHANISM IN
INTRA-STATE ABT

At Inter – state level the Unscheduled interchanges of
Inter regional sources are determined with reference to
their schedule at the point of injection but those of SEBs
with reference to their ex-periphery schedule. Datum for
working out UI not being same for all entities, this results
in UI MISMATCH which is equalised by averaging the two
ON DAILY BASIS.

The above adjustment is required to equalize payable UI
amount to receivable UI amount so that UI pool account
is maintained as a Zero balance account.

11
METHODOLOGY FOR ZERO BALANCING THE UI POOL
ACCOUNT AT INTER-STATE LEVEL
1. UI AMOUNT IS DRAWN FOR ALL THE UI POOL MEMBERS ON ACTUAL BASIS.

2. FROM THE UI ACCOUNT AMOUNT RECEIVABLE MEMBERS AND AMOUNT PAYABLE
MEMBERS TO THE POOL IS SEPERATELY DRAWN OUT.

3. AMOUNT PAYABLE AND RECEIVABLE WILL NOT MATCH BECAUSE FOR GENERATORS
THE UI IS DRAWN OUT BASED ON INJECTION & SCHEDULE AT GENERATOR PERIPHERY
WHEREAS FOR STATES THE SAME IS BASED ON DRAWAL & SCHEDULE AT STATE
PERIPHERY.

4. AS PER THE CERC STIPULATION THE UI POOL ACCOUNT SHOULD BE A ZERO BALANCE
ACCOUNT.

5. THE UI MIS-MATCH IS CALCULATED ON DAILY BASIS AND APPORTIONED TO ALL UI
POOL MEMBERS IN THE RATIO 50:50 TO THE PAYING AND RECEIVING MEMBERS IN THE
RATIO OF THE ORIGINAL UI AMOUNT DRAWN OUT.

6. A CASE STUDY BASED ON THE ABOVE METHODOLOGY FOR 19-3-2007 UI ACCOUNT
ISSUED BY NRPC IS SHOWN IN THE NEXT SLIDE.

12
SAMPLE CASE FOR 19TH MARCH 2007
ACTUAL UI AMOUNT FOR PAYEE AND RECEIVING
CONSTITUENTS

PAYING UNADJ
RECEIVING UNADJ
ENTITY IN RS.
ENTITY IN RS.
LACS LACS
SINGRAULI STPS -12.6607
RIHAND STPS -2.9686 ANTA GPP 0.1512
RIHAND-II STPS -5.1196 DADRI GPP 0.8130
DADRI TPS -8.0428
UNCHAHAR-I TPS -3.4912 URI HEP 0.1202
UNCHHR ST.2&3 -6.0003 HARYANA 380.5332
AURAIYA GPP -6.1404
BAIRASIUL HEP -2.2106 RAJASTHAN 124.5707
SALAL HEP -3.3357 U.P. 80.21921
TANAKPUR HEP -0.4534
CHAMERA HEP -7.3967 WR TO NR 114.1497
CHAMERA HEP-II -1.6079 ER TO NR 202.5246
DHAULIGANGA HEP -0.5676
NATHPA JHAKARI JHAKRI -5.3407 TOTAL PAYABLE 903.0818
TEHRI HEP -3.3180
CHANDIGARH -8.49598
DELHI -443.8578
H.P. -169.0352
J&K -19.88654
PUNJAB -39.29868
13
METHODOLOGY FOR ZERO BALANCING
THE UI POOL ACCOUNT
AT INTER-STATE LEVEL
• MIS-MATCH BETWEEN THE PAYABLE AND RECEIVABLE
AMOUNT FROM THE UI ACCOUNT IS (903.0818-820.2534)=
82.8285 LACS RUPEES.
• THIS DIFFERENCE IS DIVIDED EQUALLY BETWEEN THE
TWO i.e. PAYING & RECEIVING ENTITIES IN THE RATIO 50:50
AMOUNTING TO 41.41423 LACS RUPEES EACH.
• SINCE NO INTER-REGIONAL LINK IS AMONGST THE
RECEIVING UTILITES 41.41423 LACS IS DIVIDED AMONGST
ALL THE RECEIVING UTILITIES IN PROPORTION TO THEIR
UNADJUSTED UI AMOUNT.
• AMONGST THE PAYING UTLITIES EXCLUDING THE INTER-
REGIONAL LINKS THE AMOUNT OF 41.41423 LACS IS
CREDITED TO ALL IN PROPORTION TO THEIR UNADJUSTED
UI AMOUNT.
• THE ADJUSTED ACCOUNTS ARE DISPLAYED IN THE NEXT
SLIDE.
14
ADJUSTED UI ACCOUNT FOR PAYEE AND RECEIVING
CONSTITUENTS
RECEIVING IN AMOUNT TERMS PAYING IN AMOUNT TERMS
ENTITY UNADJ ADJ ENTITY UNADJ ADJ
IN RS. IN RS. IN RS. IN RS.
LACS LACS LACS LACS
SINGRAULI STPS -12.6607 -13.2999 ANTA GPP 0.1512 0.1405
RIHAND STPS -2.9686 -3.1184 DADRI GPP 0.8130 0.7556
RIHAND-II STPS -5.1196 -5.3781 URI HEP 0.1202 0.1117
DADRI TPS -8.0428 -8.4488 HARYANA 380.5332 353.6585
UNCHAHAR-I TPS -3.4912 -3.6675 RAJASTHAN 124.5707 115.773
UNCHHR ST.2&3 -6.0003 -6.3033 U.P. 80.21921 74.55384
AURAIYA GPP -6.1404 -6.4504 WR TO NR 114.1497 114.1497
BAIRASIUL HEP -2.2106 -2.3222 ER TO NR 202.5246 202.5246
SALAL HEP -3.3357 -3.5042 TOTAL PAYABLE 903.0818 861.6675
TANAKPUR HEP -0.4534 -0.4763
CHAMERA HEP -7.3967 -7.7701
CHAMERA HEP-II -1.6079 -1.6891
DHAULIGANGA HEP -0.5676 -0.5962
NATHPA JHAKARI JHAKRI -5.3407 -5.6103
TEHRI HEP -3.3180 -3.4856
CHANDIGARH -8.49598 -8.92494
DELHI -443.8578 -466.268
H.P. -169.0352 -177.5697
J&K -19.88654 -20.8906
PUNJAB -39.29868 -41.28285
RAILWAYS -6.91464 -7.26376
UTTARANCHAL -64.11027 -67.34717
15
TOTAL RECEIVABLE -820.2534 -861.6676
METHODOLOGY FOR ZERO BALANCING THE UI POOL
ACCOUNT AT INTRA-STATE LEVEL

In Intra – State ABT also the UI account should be a Zero
Balance Account which indicates UI payable/receivable
to/from the Regional UI pool account should be equal to
the UI receivable/payable in the Intra-State UI pool
Account.

The following mechanism is proposed :
1. SLDC shall draw-out the Intra-state UI account in
same principle as that of Inter-state UI account.

2. The amount payable / receivable to the Regional pool
account would then be equated on the basis of Intra-state
ABT amount.

16
SAMPLE CASE FOR INTRA-STATE ABT
SETTLEMENT

ACTUAL UI AMOUNT FOR PAYEE AND RECEIVING
CONSTITUENTS calculated for dated 18/02/2008

To be paid to InterState UI 409.32702 All Figures in Lakh Rs.
SETTLEMENT
RECEIVING PAYING UNADJUSTED ADJUSTED
RECEIVING PAYING TOTAL
JVVNL 0 295.8831 295.8830677 0 1.178132 1.178132 297.0612
AVVNL 0 91.60199 91.60199111 0 0.364736 0.364736 91.9667272
JdVVnl 0 250.5422 250.5421994 0 0.997596 0.997596 251.539796
RVUNL 233.78117 0 -233.7811668 2.54046426 0 2.540464 -231.2407
2.54046426 2.540464 5.080929
TOTAL 233.78117 638.0273 404.2460915 5.08092851 409.32702
Amount to be adjusted 2.54046426 2.540464

17
METHODOLOGY FOR ZERO BALANCING
THE UI POOL ACCOUNT
AT INTER-STATE LEVEL

• MIS-MATCH BETWEEN THE PAYABLE AND RECEIVABLE
AMOUNT FROM THE UI ACCOUNT IS (409.327-404.246)=
5.081 LAC RUPEES.
• THIS DIFFERENCE IS DIVIDED EQUALLY BETWEEN THE
TWO i.e. PAYING & RECEIVING ENTITIES IN THE RATIO 50:50
AMOUNTING TO 2.540 LACS RUPEES EACH.
• AMONGST THE RECEIVING UTILITES 2.540 LACS IS
DIVIDED AMONGST ALL THE RECEIVING UTILITIES IN
PROPORTION TO THEIR UNADJUSTED UI AMOUNT.
• AMONGST THE PAYING UTLITIES EXCLUDING THE INTER-
STATE ACCOUNT THE AMOUNT OF 2.540 LACS IS CREDITED
TO ALL IN PROPORTION TO THEIR UNADJUSTED UI AMOUNT.
• THE ADJUSTED ACCOUNTS ARE DISPLAYED IN THE
PREVIOUS SLIDE.