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Union of India - Section

Section 50 in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2019

50. Norms of Operation for Hydro Generating Stations.

- The norms of operation as given hereunder shall apply to hydro generating station:(A)Normative Annual Plant Availability Factor (NAPAF): (1) The following normative annual plant availability factor (NAPAF) shall apply to hydro generating station:(a)Storage and Pondage type plants with head variation between Full Reservoir Level (FRL) and Minimum Draw Down Level (MDDL) of up to 8%, and where plant availability is not affected by silt: 90%;(b)In case of storage and pondage type plants with head variation between full reservoir level and minimum draw down level is more than 8% and when plant availability is not affected by silt, the month wise peaking capability as provided by the project authorities in the DPR (approved by CEA or the State Government) shall form basis of fixation of NAPAF;(c)Pondage type plants where plant availability is significantly affected by silt: 85%.Run-of-river generating stations: NAPAF to be determined plant-wise, based on 10-day design energy data, moderated by past experience where available/relevant.
(2)A further allowance may be made by the Commission in NAPAF determination under special circumstances, e.g. abnormal silt problem or other operating conditions, and known plant limitations.
(3)A further allowance of 5% may be allowed for difficulties in North East Region.
(4)Based on the above, the Normative annual plant availability factor (NAPAF) of the hydro generating stations already in operation shall be as follows:-
Station Type of Plant Plant Capacity No. of Units x MW NAPAF (%)
THDC      
THDC Stage I Storage 4x250 80
KHEP Storage 4x100 68
       
NHPC      
Bairasul Pondage 3x60 90
Loktak Pondage 3x35 88
Salal ROR 6x115 64
Tanakpur ROR 3x31.4 59
Chamera-I Pondage 3x180 90
Uri I ROR 4x120 74
Rangit Pondage 3x20 90
Chamera-II Pondage 3x100 90
Dhauliganga Pondage 4x70 78
Dulhasti Pondage 3x130 90
Teesta-V Pondage 3x170 87
Sewa-II Pondage 3x40 89
TLDP III Pondage 4x33 77
Chamera III Pondage 3x77 87
Chutak ROR 4x11 48
Nimmo Bazgo Pondage 3x15 70
Uri II ROR 4x60 70
Parbati III Pondage 4x130 43
       
NHDC      
Indira Sagar Storage 8x125 87
Omkareshwar Pondage 8x65 90
       
NEEPCO      
Kopili I Storage 4x50 69
Khandong Storage 2x25 67
Kopili II Storage 1x25 69
Doyang Storage 3x25 70
Ranganadi Pondage 3x135 88
       
NTPC      
Koldam Storage 4x200 90
       
SJVNL      
Nathpa Jhakri ROR 6x250 90
Rampur ROR 6x68.67 85
       
DVC      
Panchet Storage 2x40 80
Tilaya Storage 2x2 80
Maithon Storage 3x20 80
       
Teesta III Pondage 6x200 85
(B)In case of pumped storage hydro generating stations, the quantum of electricity required for pumping water from down-stream reservoir to up-stream reservoir shall be arranged by the beneficiaries duly taking into account the transmission and distribution losses up to the bus bar of the generating station. In return, beneficiaries shall be entitled to equivalent energy of 75% of the energy utilized in pumping the water from the lower elevation reservoir to the higher elevation reservoir from the generating station during peak hours and the generating station shall be under obligation to supply such quantum of electricity during peak hours:
Provided that in the event of the beneficiaries failing to supply the desired level of energy during off-peak hours, there will be pro-rata reduction in their energy entitlement from the station during peak hours:Provided further that the beneficiaries may assign or surrender their share of capacity in the generating station, in part or in full, or the capacity may be reallocated by the Central Government, and in that event, the owner or assignee of the capacity share shall be responsible for arranging the equivalent energy to the generating station in off-peak hours, and be entitled to corresponding energy during peak hours in the same way as the original beneficiary was entitled.
(C)Auxiliary Energy Consumption (AEC):
Type of Station AEC
Installed Capacity above 200 MW Installed Capacity upto 200 MW
Surface    
Rotating Excitation 0.70% 0.70%
Static 1.00% 1.20%
Underground    
Rotating Excitation 0.90% 0.90%
Static 1.20% 1.30%
Norms of operation for transmission system