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Issue of Declared Capacity (DC), and Actual Generation (AG) by Generating Stations

Issue of Declared Capacity (DC), and Actual Generation (AG) by Generating Stations. Hon’ble Commission has issued Interim order dated 19/26.10.2005. directing :

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Issue of Declared Capacity (DC), and Actual Generation (AG) by Generating Stations

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  1. Issue of Declared Capacity (DC), and Actual Generation (AG) by Generating Stations Hon’ble Commission has issued Interim order dated 19/26.10.2005. directing : SRLDC to conduct an enquiry to verify the details of declared capacity (DC), actual generation (AG) in respect of the generating stations belonging to NTPC and NLC, during the period 28.2.2005 to 24.4.2005 and submit a report to the Commission latest by 10.11.2005.

  2. Details of Actual Generation (AG) and Declared Capacity (DC ) • The day-wise details of the AG and DC by the NTPC and NLC stations during the relevant period of 56 days ( i.e. from 28.02.2005 to 24.04.2005) . (i) No. of days when the generation level increased beyond 101% of DC in a day. (out of total 56 number of days)

  3. No. of blocks when the generation level was more than 105% of DC . (out of total 5376 number of blocks)

  4. The Range and average of the daily actual generation over DC. (During 28-02-2005 to 24-04-2005)

  5. Declaration of Higher DC Enhancement in the DC in case of Ramagundam STPS is there in the range of 30 – 60 MW with details as follows. Subsequent to the persuasion by SRLDC similar trend is being followed by Talcher STPS and enhancement of DC in case of Talcher STPS is in the range of 20-50 MW. Enhancing the availability at the pit head generating stations is a step in the direction of achieving maximum economy and efficiency.

  6. Tapping Additional Capacity • In the country under Central Sector thermal ISGSs, a capacity of around 20,000 MW of generation is available and on an average even if 1% of the additional capacity is tapped in this manner, then an additional availability of 200 MW can be created, which would be of extreme importance and benefit to all.

  7. Tapping Additional Capacity • Harnessing of any such additional capacity by way of declaration of higher DC is beneficial to the constituents as well as to the grid and must be encouraged.

  8. Whether there was willful under-declaration by the Generating Stations Clause 2 of Regulations 24 on Terms and Conditions of Tariff 2004 (i) Any generation up to 105% of the declared capacity in any time block of 15 minutes and averaging up to 101% of the average declared capacity over a day shall not be construed as gaming, and the generator shall be entitled to UI charges for such excess generation above the scheduled generation (SG). (ii) For any generation beyond the prescribed limits, the Regional Load Despatch Centre shall investigate so as to ensure that there is no gaming, and if gaming is found by the Regional Load Despatch Centre, the corresponding UI charges due to the generating station on account of such extra generation shall be reduced to zero and the amount shall be adjusted in UI account of beneficiaries in the ratio of their capacity share in the generating station.

  9. Whether there was willful under-declaration by the Generating Stations • Clause 29(1) of the Electricity Act The Regional Load Despatch Centre may give such directions and exercise such supervision and control as may be required for ensuring stability of grid operations and for achieving the maximum economy and efficiency in the operation of the power system in the region under its control.

  10. In order to have both the above Clauses implemented concurrently i.e. to restrict the AG within 101% of the DC (without losing the extra generation) the only possibility is that the DC is revised very frequently in real time in order to make it closer to the actual generation.

  11. UI injection during the relevant period along with UI Rate * direct export to the WR/ER constituents under UI ** the UI Rate arrived is after accruing the interregional benefit. Average UI Rate IN SR = 238 Paisa (49.74 Hz.) Average UI Rate IN ER/WR = 302 Paisa (49.60 Hz.) Frequency Profile in SR : < 49.5 Hz. = 11.53%; < 50.0 Hz. = 91.12%; 49.0 to 50.5 Hz. = 99.84% As evidently clear from the above, the extra generation carried out by the generating stations contributed in enhancing the availability and export to WR/ER regions, when they were operating at a frequency lower than SR. It can thus be seen that the extra harnessed generation was helpful in achieving overall economy and efficiency in the region.

  12. Ways and Means to tap extra generation • The Hon’ble Commission during hearing on 6.10.05 on the above issue had intended that it is desirable that such extra generation must be tapped and any commercial issues/implications related to this can be brought to the notice of commission.

  13. ISSUES • Declaration of capacity (DC) - above normative • Extra Generation – Why not in the form of enhanced DC • Extra Available Capacity – How to Harness the margins/opportunistic capacity • Any Commercial Mechanism to suggest for tapping the extra generation capacity.

  14. Excess Energy in MU When AG > DC by 101%(During 28-02-2005 to 24-04-2005)

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