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Union of India - Section

Section 37 in Central Electricity Regulatory Commission (Terms and Conditions of Tariff) Regulations, 2014

37. Norms of operation for hydro generating stations.

(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%.
(d)Run-of-river type plants: 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 (%)
NHPC      
Chamera–1 Pondage 3 x 180 90
Bairasul Pondage 3 x 60 90
Loktak Storage 3 x 35 85
Chamera-II Pondage 3 x 100 90
Chamera–III Pondage 3 x 77 85
Rangit Pondage 3 x 20 90
Dhauliganga Pondage 4 x 70 90
Teesta–V Pondage 3 x 170 85
Dulhasti Pondage 3 x 130 90
Salal ROR 6 x 115 60
Sewa–II Pondage 3 x 40 85
Uri ROR 4 x 120 70
Tanakpur ROR 3 x 31.4 55
Chutak ROR 4 x 11 50
NimooBazgo Pondage 3 x 15 65
Teesta Low Dam Project-III Pondage 4 x 33 85
Uri-II Pondage 4 x 60 55
NHDC      
Indirasagar Storage 8 x 125 85
Omkareshwar Pondage 8 x 65 90
THDC      
Tehri Storage 4 x 250 77
Koteshwar Storage 4x100 67
SJVNL      
Nathpa Jhakri Pondage 6 x 250 90
NEEPCO      
KopiliStg–1 Storage 4 x 50 79
Khandong Storage 2 x 25 69
Kopili Stg.–2 Storage 1 x 25 69
Doyang Storage 3 x 25 73
Ranganadi Pondage 3 x 135 85
DVC      
Panchet Storage 2 x 40 80
Tilaiya Storage 2 x 2 80
Maithon Storage 3 x 20 80
(5)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 etc. 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.
(6)Auxiliary Energy Consumption (AUX):
(a)Surface hydro generating stations
(i) with rotating exciters mounted on the generator shaft : 0.7%
(ii) with static excitation system : 1.00%
(b)Underground hydro generating stations
(i) with rotating exciters mounted on the generator shaft : 0.9%
(ii) with static excitation system : 1.2%
Norms of operation for transmission system