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Settlement System under ABT Regime

Settlement System under ABT Regime. WHAT IS SETTLEMENT ?. “ Settlement means finalisation of payment bill after consumption” To be FAIR and EQUITABLE To RECOVER DUES at the EARLIEST (Billing Cycle) TRANSPERANCY Dispute Resolution Reconciliation. AVAILABILITY TARIFF(ABT).

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Settlement System under ABT Regime

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  1. Settlement System under ABT Regime

  2. WHAT IS SETTLEMENT ? • “ Settlement means finalisation of payment bill after consumption” • To be FAIR and EQUITABLE • To RECOVER DUES at the EARLIEST (Billing Cycle) • TRANSPERANCY • Dispute Resolution • Reconciliation

  3. AVAILABILITY TARIFF(ABT) (a) CAPACITY CHARGE (b) ENERGY CHARGE • ADJUSTMENT FOR DEVIATIONS (UI CHARGE) • = a function of Ex-bus MW avilability of power plant for the day declared before the day starts x SEB’s % share . • = MWh for the day as per ex=bus drawal schedule for the SEB finalized before the day starts x Energy charge rate • =Σ(Actual energy interchange in a 15 min time block – scheduled energy interchange for the time block) x UI rate for the time block. TOTAL PAYMENT FOR THE DAY = (a) + (b)± ( c)

  4. Capacity charge: Capacity charge is based on Annual Fixed Charge and will be related to availability of generating station. Availability means the readiness of the generating station to deliver ex-bus output expressed as a percentage of its rated ex-bus output capability. Energy charge: Energy charge is related to the scheduled ex-bus energy to be sent out from the generating station and will be worked out on the basis of paise per KWh.

  5. Settlement Systems* • On weekly basis : • For seven day period ending on penultimate Sunday • RLDC to furnish Scheduling & Metering data to REB • Sectt. by Thursday noon • REB Sectt. to issue Weekly UI a/c by Tuesday • Pool a/c operated by RLDC • Settlement for UI on weekly basis • All accounts open for 20 days • On monthly basis : • REB to issue REA specifying % Avb, % Net Entitlement, % Energy charges, Wt. Avg. Ent. for Tr. Ch. etc. • Capacity and Energy Charges, Incentive etc. • –billed directly by ISGS based on REA issued by REB SRLDC/Comml/IEGC/34

  6. WEEKLY ENERGY ACCOUNTING: WEEKLY CYCLE : 00 HRS OF EACH MONDAY TO 24 HRS; OF THE THE FOLLOWING SUNDAY ACTIVITIES MONDAY MORNING : SEM DATA DOWNLOADED TO DCD : DCD DATA LOADED TO A LOCAL PC : DATA SENT TO RLDC via E-MAIL (LATEST TUESDAY MORNING ) THURSDAY NOON : RLDC CONVEYS PROCESSED DATA TO REB Tues day : WEEKLY UI a/c & Reactive charges issued BY REB BILLING Cap. Charge : BILLED MONTHLY based on DAILY DC BY ISGS ENERGY CHARGE : BILLED MONTHLY based on DAILY DRAWL SCHEDULES ISSUED BY RLDC UI a/c Paid/Disbursed as per UI a/c issued by REB REACTIVE a/c

  7. SETTLEMENT SYSTEM For the day: 0000 hrs. to 2400 hrs. Central Generating Stations 1 2 3 Ex-Bus Capability x1 x2 x3 (Forecast) ____ ___ ___ SEB-A’s share a1 a2 a3 SEB-B’s share b1 b2 b3 SEB-C’s share c1 c2 c3 For a particular 15 minute time block SEB-A’s requisition a’1 a’2 a’3 SEB-B’s requisition b’1 b’2 b’3 SEB-C’s requisition c’1 c’2 c’3 ___ ___ ___ CGS’s schedule x1’ x2’ x3’ MW SRLDC/Comml/IEGC/37

  8. 1000 MW Forecast ex-bus capability of power plant 800 600 SEB - A’s entitlement (40%) 400 200 0 0 6 12 18 HRS 24 Declared Capability for which Capacity charges Are recieveable by ISGS Gen.Sched. for which Energy charges Are recieavable by ISGS Schedule for which Energy charges Are payable by SEB- A Entitlement for which Capacity charges Are payable by SEB-A

  9. SETTLEMENT SYSTEM Total capacity charge payable to CGS-1 for the day = x1 * capacity charge rate of CGS-1 Total Energy charge payable to CGS-1 for the day = x1’ * Energy charge rate of CGS-1 4 Total capacity charge payable by SEB-A for the day = a1 * capacity charge rate of CGS-1 + a2 * -do- CGS-2 + a3 * -do- CGS-3 Total Energy charge payable by SEB-A for the day = (a1’) * Energy charge rate of CGS-1 ( 4 ) + (a2’) * -do- CGS-2 ( 4 ) + (a3’) * -do- CGS-3 ( 4 ) All capacity charge and Energy charge payments to be made by SEBs directly to CGS. SRLDC/Comml/IEGC/38

  10. SETTLEMENT SYSTEM Actual (metered) injection of CGS-1 in the time block = X1MWh. Excess injection = (X1 – x1’ ) MWh. 4 Amount payable to CGS-1 for this =(X1-x1’) * pool price for the block. 4 SEB-A’s scheduled drawl for time block = a1’+a2’+a3’ = a’ MW (ex-CGS Bus) SEB-A’s NET drawal schedule = (a’ – Notional Transm. Loss) MW = (a’ – Notional Transm. Loss)= A’ MWH 4 Actual (metered) net drawal of SEB-A during time block = A MWH Excess drawal by SEB-A = (A-A’) MWh. Amount payable by SEB-A for this = (A-A’) * pool price for the block. All above payments for deviations from schedules to be routed through a pool A/C operated by RLDC SRLDC/Comml/IEGC/39

  11. Previous definition of Capacity charges n i i=1 (1-aux/100) i Where SOC = Sent Out capability for the I th block n = total no. of blocks in the period under consideration aux = normative % auxiliary consumption as % of gross Gen. CL = Gross MWh of capacity kept closed on a/c of Gen. Sched order IC= installed capacity in MW h = no. of hours during the period = n/4 % Availability forms the basis for calculations % Availability for ISGS = ∑ SOC +CL 100 h x IC

  12. Present Definition Capacity charges N DCi/ {NxICx(100-Auxn) }% % Availability = 10000 i=1 Where DCi = Average Declared Capacity for i th day of the period in MW N = Total no. of days during the period Auxn = Normative Auxiliary Consumption as % of gross Gen. IC= installed capacity in MW % Availability forms the basis for calculations N PLF = SGi/ {NxICx(100-Auxn) }% 10000 i=1

  13. Recovery of Annual fixed charges 100% recovery if % Availability >=Target Availability Pro-rata reduction if %Avb<T.Avb. Target Avb. For Fixed ch recovery Target PLF for incentive Both to be Notified by CERC Financial Year forms the basis for calculations Target Avb. Target PLF RSTPS 80% 80% NLC 75% 75%

  14. Monthly Capacity charges receivable by an ISGS:1 st Month = (1xACC1)122 nd Month = (2xACC2-1ACC1)12….….12 th month = (12xACC12-11ACC11)12where ACC1,ACC2…….ACC12 = Annual capacity charges corresponding to the cum. Availability up to the corresponding month. Monthly Capacity charges payable by a beneficiary :1 st Month = (1xACC1xWB1)122 nd Month = (2xACC2xWB2-1ACC1xWB1)12….….12 th month = (12xACC12xWB12-11xACC11xWB11)12where WB1,WB2…..WB12 = Weighted average % share up to the corresponding month.

  15. Fixed/Variable

  16. The Energy Charges Payable by beneficiary to the ISGS = Variable Charge of ISGS X Requisition of beneficiary from The ISGS The Energy Charges Receivable by ISGS from beneficiaries = Variable Charge of ISGS X Despatch schedule of ISGS Energy charges

  17. Incentive as per old norms Incentive rate up to 90%PLF = 50% Annual Fixed charges Energy per anum at target PLF Incentive rate up to 90%PLF = 50% Annual Fixed charges Energy per anum at target PLF Incentive rate up to 90%PLF = 50% Annual Fixed charges Energy per anum at target PLF PLF = scheduled energy IC x no. of hours Incentive rate beyond 90%PLF = 25% Annual Fixed charges Energy per anum at target PL

  18. Incentive as per New norms • Flat rate of 25ps/u • For ex-bus Schedule Energy in Excess of ex-bus energy corresponding to Target PLF

  19. Unscheduled Interchanges (UI) Variations in actual generation/drawal and scheduled generation /drawal are accounted through UI. This is a frequency linked charge which is worked out for each 15 minute time block. Charges for all UI transaction, based on average frequency have following rate of paise per KWh from 01.01.03 upto 31.03.04. UI rate (Paise per KWh) Average Frequency of time block 50.5 Hz. and above 0.0 Below 50.5 Hz. and upto 50.48 Hz. 5.6 Below 49.04 Hz. and upto 49.02 Hz. 414.4 Below 49.02 Hz. 420.0 Between 50.5 Hz. and 49.02 Hz. Linear in 0.02 Hz. step

  20. UI rate w.e.f 01.04.04 to 30.09.04 UI rate (Paise per KWh)Average Frequency of time block 50.5 Hz. and above 0.0Below 50.5 Hz. and upto 50.48 Hz. 8.0Below 49.04 Hz. and upto 49.02 Hz. 592.0Below 49.02 Hz. 600.0Between 50.5 Hz. and 49.02 Hz. Linear in 0.02 Hz. step

  21. UI rate w.e.f 01.10.04 UI rate (Paise per KWh)Average Frequency of time block (Hz,) Below Not below ----- 50.50 0.050.50 50.48 6.050.48 50.46 12.0----- ----- ---------- ----- ----- 49.84 49.82 204.049.82 49.80 210.049.80 49.78 219.049.78 49.76 228.0----- ----- ---------- ----- ----- 49.04 49.02 561.049.02 ----- 570.0(Each 0.02 Hz. Step is equivalent to 6.0 paise/kWh in the 50.5-49.8 Hz. Frequency range and to 9.0 paise/kWh in the 49.8-49.0 Hz. Frequency range).

  22. Under drawl by SEB-A Over Gen. By ISGS-1 UI import from IR-1 Regional Pool System frequency UI Rate Under gen. By ISGS-2 UI Export to IR-2 Over drawl by SEB-B No one to onecorrespondence Energy transactions of UI from/to Pool

  23. Operation of Pool Separate Pool a/cs operated by RLDCs on behalf of REBs for UI, IRE and Reactive charges Payable by SEB-B Payable by IR-2 at its UI rate Payable by ISGS-2 Regional Pool Receivable by ISGS-1 (up to DC) Receivable by IR-1 at its UI rate Receivable by SEB-A No one to one correspondence No cross adjustments allowed between the constituents

  24. Where do SEMs come into picture? • Only measuring Deviations from Schedule i.e. UI • To measure 15 min block-wise Energy and Frequency Issues concerned : -Specifications -Location criterion -Main/Check/Standby philosophy

  25. SEMsSpecification • Static type • Composite meter • Highest accuracy available in the power industry • 3 Phase – 4 wire connections/measurement • Direct measurement in whrs and varh on the CT/PT secondaries • 110 V Ph to Ph /63.51 V Ph – N • 1 amp or 5 amp • VA burden not more than 10 on any of the phases • Works on real time clock • No calibration required

  26. FEATURES OF SPECIAL ENERGY METERS : • ACCURACY : 0.2 S AS PER OEC -687, 1992 • STATIC, TOTALLY TAMPER - PROOF, SEALED FOR LIFE • GALVANIC ISLATION AND SURGE SUPRESSION • TWO STANDARD MODELS : 110V, 1A AND 110V, 5A • NON - VOLATILE MEMORY FOR 10 DAYS • HARMONICS FILTERED OUT AND ONLY FUNDAMENTAL ENERGY RECORDED • ALL MEASUREMENTS, RECORIDNG IN SECONDARY QUANTITIES. CT AND VCT RATION APPLIED IN REGIONAL COMPUTATION • NET ENERGY ( WH) EXCHANGE IN EACH 15 MIN. BLOCK • CUMULATIVE WH TRANSMITTAL AT EACH MIDNIGHT • AVERAGE FREQUENCY IN EACH 15 MIN. BLOCK • CUMULATIVE REACTIVE ENERGY EXCHANGE WHILE VOLTAGE IS 97% OR BELOW • CUMULATIVE REACTIVE EXCHANGE WHILE VOLTAGE IS 103% OR ABOVE.

  27. FEATURES OF SPECIAL ENERGY METERS : contd…. • HIGH-ACCURACY OF INTERNAL CLOCK: ONE MINUTE/MONTH,WITH RESTRICTED ADVANCE/ RETARD FACILITY • TAGGING OF DATA WITH DATE, TIME METER NO. IDENTIFICATION OF TIME BLOCK WHEN VT SUPPLY DISTRUBED • NO SEPARATE AUXILIARY SUPPLY ; ONLY OPTICAL COUPLER FOR DATA COLLECTION ( WEEKLY) • DISPLAYS TO APPRISE THE SUBSTATION OPERATOR AS TO WHAT IS BEING RECORDED IN METERS MEMORY

  28. Raw data WEEK FROM 0000 HRS OF 06-01-01 TO 0837 HRS OF 15-01-01 NP-0185-A 91858.5 99968.5 39195.5 06-01-01 00 51 +21.57 48 +21.68 50 +21.71 49 +21.33 04 19 +20.61 23 +20.80 19 +21.05 00 +21.35 08 00 +24.95 00 +24.95 00 +25.09 00 +24.38 12 71 +24.38 52 +23.98 30 +23.81 13 +24.03 16 00 +23.37 00 +23.52 00 +22.87 00 +21.66 20 00 +25.75 00 +25.32 00 +25.40 00 +25.37 NP-0185-A 94117.2 99968.5 40313.5 07-01-01 00 59 +20.94 54 +21.01 59 +20.79 58 +21.05 04 33 +20.05 38 +20.17 37 +20.49 28 +20.90 08 00 +22.99 06 +23.10 00 +22.81 00 +22.94 12 85 +20.93 51 +20.65 21 +20.79 00 +19.89 16 07 +20.14 01 +20.53 00 +20.72 00 +20.66 20 05 +23.62 08 +23.23 16 +23.25 27 +23.40 NP-0185-A 96172.2 99968.5 41236.9 08-01-01

  29. Computed Mwh data 230 kV Neyveli line at Pondicherry CTR = 600 PTR = 2091 PO-02 NP-0185-A 06-01-01 2833.8145 0.0 1402.6 0000 27.061722 27.199728 27.237366 26.760618 0100 26.911171 26.547337 26.735525 25.907490 0200 26.196047 25.932583 26.522243 26.622612 0300 26.509697 26.321507 25.844761 25.644024 0400 25.857307 26.095678 26.409328 26.798256 0500 26.785711 27.839575 28.567242 28.780525 0600 29.458008 29.269817 30.072762 30.198221 0700 31.126625 31.314816 31.289724 31.214447 0800 31.302271 31.302271 31.477915 31.603374 0900 31.603374 31.289724 31.402639 31.553190 1000 30.775339 31.201902 31.565735 31.515553 1100 31.603374 30.198221 30.424049 30.235861 1200 30.587147 30.085308 29.872025 30.148039 …. ….. ….. ….. ….. 2300 27.726660 27.350279 26.760618 26.346600

  30. Active energy ENERGY ACCOUNTING USING SPECIAL ENERGY METER FOR 15-12-00 -------------------------------------------- TIME PONDY YANAM Net Drawal PO-02 PO-06 IN Mwhr -------------------------------------------- 00:00 +31.77 +1.83 +33.60 00:15 +31.68 +1.83 +33.51 00:30 +32.06 +1.85 +33.90 00:45 +31.59 +1.77 +33.36 01:00 +31.11 +1.54 +32.65 01:15 +30.76 +1.62 +32.39 01:30 +30.94 +1.57 +32.51 01:45 +31.06 +1.79 +32.85 02:15 +31.04 +1.85 +32.88 ------------------------------------------ ------------------------------------------- 23:15 +27.38 +1.90 +29.27 23:30 +27.00 +1.91 +28.90 23:45 +26.48 +1.89 +28.37 -------------------------------------------- TOTAL +3060.16 +176.12 +3236.28 ---------------------------------------------

  31. REACTIVE ENERGY CHARGE : PAYABLE FOR : 1. VAR DRAWALS AT VOLTAGES BELOW 97% • VAR INJECTION AT VOLTAGES ABOVE 103% RECEIVABLE FOR: 1. VAR INJECTION AT VOLTAGES BELOW 97% • VAR DRAWAL AT VOLTAGES ABOVE 103% APPLIED FOR VAR EXCHANGES BETWEEN : A) BENEFICIARY SYSTEM AND ISTS - THROUGH A POOL ACCOUNT B) TWO BENEFICIARY SYSTEMS ON INTER-STATE TIES - BY THEMSELVES RATE: @ Rs. 48.62/MVArh (for 2004-05) Basic Rate : 4 paise/kvArh ( for the year 2000-01 ) 5% ESCALATION PER YEAR

  32. Issues in Reactive Energy charges • Deficit in pool (SR & ER) -due to continuous High voltages in SR Surplus in Pool (NR &WR) Utilization of Accruals Disputes in payments between Beneficiaries for Reactive charges in Inter-state Lines

  33. SOUTHERN REGIONAL ELECTRICITY BOARD ABT based U.I. Account FOR THE PERIOD 25.10.2004 to 31.10.2004 A.ABSTRACT OF UNSCHEDULED INTERCHANGES ( UI figures in Rs. Lakhs)

  34. NOTE:1.Revised UI rates w.e.f. 1/10/2004 vide CERC (Terms and Conditions of Tariff) (First Amendment) Regulations 2004.2.MAPS & KGS not covered under ABT; hence UI reduced to zero, under all conditions.3.UI for Talcher STPS Stage-II has been calculated at ER frequency.4.IR Exchanges:i) Metering points – For WR it is Chandrapur South Bus. - For ER it is Gazuwaka East Bus & Talcher stage I&II I/C bus.ii)UI for IR exchanges with ER has been calculated at SR frequency as per the decision taken in Special TCC meeting held at Bangalore on 23.08.2004.iii)UI charges with WR and ER has been taken as first charge, as per decision taken in Special Committee meeting held on 17.12.2002.

  35. A.ABSTRACT OF UNSCHEDULED INTERCHANGES (restricting to the lesser of the two as per the 126th SRE Board decision). (UI figures in Rs. Lakhs)

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