Grid Operation --- Role of RLDC

Contents Load Generation Balance Electricity Accounting Real Time Trends ABT Feedback Inter Regional Exchanges Loading of Transmission Network

LOAD GENERATION BALANCE

LOAD DIVERSITY The unique load curve of different identities due to varied nature of load / requirements results in the overall load diversity.

DEMAND ESTIMATION Availability = Own Generation (+) Entitlement from Grid (+) Bilaterals

ENTITLEMENTS = Fixed Shares + Unallocated Shares

FIXED SHARES Allocation to States from the Central Sector Stations in terms of Percentages which generally remain fixed. UNALLOCATED SHARES Allocation to States from Central Sector Stations in terms of Percentages which are changed on seasonal basis and / or under typical conditions as decided by Govt. of India.

ELECTRICITY ACCOUNTING ABT vis-à-vis Pre-ABT Period

Components of inter-utility tariff (Pre – ABT Mechanism)  Fixed charges  Interest on loans  Depreciation  O & M charges  Return on equity  Interest on Working Capital  Energy charges (fuel cost)  Incentives  Surcharge & other levies  No charge for reactive energy

TENTATIVE COST FOR NTPC THERMAL STATIONS FOR THE MONTH OF DEC 2003 Station Fixed Cost Rs. Cr/yr (1) Average Fixed Cost Rs. Cr/day (2) Average Fixed Cost P / KWh (3) Variable Base Cost P / KWh (4) Variable FPA P / KWh (5) Total Variable Base Cost P / KWh (6) Composite Cost P / KWh (3) + (6) Singrauli Rihand Unchahar – I Anta GPS* Auraiya GPS* DadriGPS G) Dadri (T) Unchahar – II Dadrigas(L) *Rates for mixed fuel (gas+ liquid fuel, naphtha)

Payment to Inter State Generating Stations (ISGS) from beneficiaries under Availability Based Tariff (ABT)  Capacity charges  Energy charges  Unscheduled Interchange (UI)

CAPACITY CHARGE Capacity charge will be related to ‘availability’ of the generating station and the percentage capacity allocated to the state. ‘Availability’ for this purpose 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 charges shall be worked out on the basis of a paise per kwh rate on ex-bus energy scheduled to be sent out from the generating station as per the following formula Energy charges = Rate of energy charges (paise/kwh) x Scheduled Generation (ex-bus MWh)

Energy Charges (paise/kwh) for Central Sector stations (Dec 2003) Sl. No.Power StationRate (Paise / KWh) 1.Salal Tanakpur Singrauli Rihand Anta/Auraiya/Dadri GT Unchahar Dadri (Thermal)145.00

UNSCHEDULED INTERCHANGE (U I) :  Variation in actual generation / drawal with respect to scheduled generation / drawal shall be accounted for through Unscheduled Interchange (UI).  UI for generating station shall be equal to its total actual generation minus its scheduled generation.  UI for beneficiary shall be equal to its total actual drawal minus its total scheduled drawal.

UNSCHEDULED INTERCHANGE (UI) RATES Average frequency of 15 minute time block UI Rate (Paise / KWh) 50.5 Hz & Above0.0 Below Hz & up to Hz 8.0 Below Hz & up to Hz Below Hz600.0 Between Hz & Hz Linear in 0.02 Hz step

FREQUENCY vs UI PRICE FREQUENCY PAISE/UNIT 49 HZ 50.5 HZ 49.5 HZ 50 HZ 49.5 HZ CORRESPONDS TO RS.4.00 UI PRICE AND FREQUENCY

UNSCHEDULED INTERCHANGES (UI) I.E. DEVIATIONS FROM SCHEDULES  Makes all the players in the grid self-responsive and enhances merit order.  Good UI helps in improving frequency and enables one constituent to help the other (for meeting more consumer demand i.e reducing load shedding)  UI provides the mechanism for on-line displacement of costlier generation by cheaper generation : ultimate optimisation.

REACTIVE ENERGY CHARGES Under ABT, a reactive energy charge in paise/kwh is applicable. The charges would 4.0 paise/kVARh upto 31 st March 2001 and 5% per annum. This would be applicable for reactive power exchanges outside the % voltage band.

REAL TIME TRENDS

ABT FEEDBACK

Singrauli & Rihand Pre ABT(Dec 01-Nov 02)Post ABT(Dec 02-Nov 03) Average MW Declared CapabilityInjection Schedule Unchahar-1 & Pre ABT(Dec 01-Nov 02)Post ABT(Dec 02-Nov 03) Average MW Declared CapabilityInjection Schedule Dadri (T) Pre ABT(Dec 01-Nov 02) Post ABT(Dec 02-Nov 03) Average MW Declared CapabilityInjection schedule Anta, Auraiya & Dadri Pre ABT(Dec 01-Nov 02) Post ABT(Dec 02-Nov 03) Average MW Declared CapabiltyInjection Schedule

INTER REGIONAL EXCHANGES

HCDC Sasaram B-B HCDC Vindhyachal B-B HCDC Gazuaka B-B HCDC Talcher Kolar HCDC Chandrapur B-B Inter Regional HVDC Links

100 MW ISGS Allocations 0000 to 2400 hrs 100 MW WBSEB to J&K 0000 to 2400hrs- PTC 50 MW GRIDCO to DTL-NVVNL 140 MW WBSEB to DTL 0000 to 2400-PTC 100 MW DVC to HVPNL 0000 to 1700 & 2300 to 2400 hrs-PTC 10 MW GRIDCO to HVPNL 0000 to 1700 & 2300 to 2400 hrs-NVVNL MW DVC to DTL- PTC 450

NR BILATERAL AGREEMENTS

LOADING OF TRANSMISSION NETWORK

ECONOMY OF REQUISITIONING FROM GAS STATIONS ON LIQUID FIRING Energy Charges (Liquid Firing) AntaRs. 3.20/unit AuraiyaRs. 3.00/unit DadriRs /unit (approx) UI Rates 49.5 HzRs HzRs HzRs HzRs HzRs Hz & BelowRs Tariff Regulation – Economy and Efficiency vis-à-vis Security

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