|
5.
Variable Charges
The generating unit uses coal from the
collieries of Central Coalfields Ltd. (CCL). The coal is
transported through road over a distance of about 34 to 49 kms.
The completion of MGR system to transport coal is delayed and
efforts are being made to complete this as early as possible.
The Petitioner received Rs.8 crores from the Government
of Jharkhand towards construction of MGR system in 2006-07.
In the tariff order for the year FY 2008-09
the petitioner registered specific consumption of coal at 0.715
kg/kWh based on the heat rate of 3075 kcal/kWh. The normative
levels are far from the ground situations experienced by most
plants in India. The normative level of heat rate may be
applicable for the stations operating at high level of
efficiency and high plant load factor.
The Tenughat Thermal Power Station is
operating under various constraints.
-
Momentary outages due to tripping
of transmission lines.
-
Outages
due to other reasons.
-
Backing down of the units under
instructions of JESB due to lack of load.
Table 25: Specific Coal Consumption & Heat
Rate for FY’09
|
Year |
Specific Coal Consumption (kg/kWh) |
Heat Rate (kCal/kWh) |
|
2009-10 |
0.720 |
3100 |
|
The transport of coal on a bumpy road in fully
loaded trucks is resulting in loss of coal by spilling from the
trucks. In addition, there is loss due to wind, evaporation of
moisture, during rainy season the coal powder gets washed out.
All these factors result in loss of coal in transport and
storage. The coal is weighed at loading end and at receiving
end, the difference accounts for loss in transit. The experience
has shown that the loss accounts to about 0.3 % of coal
transported. TVNL requests the Honourable Commission to allow
0.3 % of total coal transported towards transit loss in FY
2009-10.
The specific consumption of secondary fuel
(oil) during the last two years is given below:
Table 26: Specific Oil Consumption
|
Year |
Specific Consumption (ml/kWh) |
|
2007-08 |
1.96 |
|
2008-09 |
2.78 |
|
2009-10 |
2.50 |
|
|
The station authorities had
brought down the oil consumption considerably during FY
2006-07 to 2.31 ml/kWh from the 6 – 14 ml/kWh levels
experienced during FY 2000-01 to FY 2003-04. The norm of
2.0 ml/kWh may be workable for a station working
efficiently. It may be difficult to limit the oil
consumption to 2.0 ml for a station like TTPS with a
numerous outages due to transmission line trippings,
backing down of units, etc. For the FY 09, petitioner
registered a specific oil consumption of 2.78 ml/kWh .
Petitioner is working to reduce this level of consumption
and hence is targeting to achieve a level of 2.50 ml/kwh
for FY 10.
The delivered cost of coal was Rs.1295.50 /
MT. The delivered cost of oil at the thermal station by
the oil companies was Rs. 39045/kL during the year
2008-09.
Petitioner projects landed cost of coal at
Rs.1300/MT which is only an increase of Rs.5/MT and
delivered cost of oil is expected to be at the level of
Rs.39045/kL.
The cost of coal and oil consumption based on
the projected prices for FY 2009-10 indicated above and
the coal and consumption worked against the electricity
generation results in an aggregate fuel cost of Rs.259.71
Crores for FY 2009-10 as detailed
in the Table 27 below:
Table
27: Variable Cost
|
S.No |
Item |
Derivation |
Unit |
2008-09 |
2009-10 |
|
1 |
Installed Capacity |
IC |
MW |
420 |
420 |
|
|
PLF |
PLF |
% |
60.43% |
67.68% |
|
|
Generation |
A = IC*PLF*8.76 |
MU |
2223 |
2490 |
|
|
Auxiliary
Consumption |
B |
% |
8.37% |
9.00% |
|
|
Net Generation |
C = A*(1-B) |
MU |
2037 |
2266 |
|
2 |
Specific Coal
Consumption |
D |
kg/kWh |
0.715 |
0.720 |
|
|
Total Coal
Consumption |
E = A*D*1000 |
MT |
1589801 |
1792859 |
|
|
Total Coal
Consumption including transit losses @ 0.3% |
E'' = E*1.003 |
MT |
1594570 |
1798238 |
|
|
Delivered Coal
Price |
F |
Rs./MT |
1295.50 |
1300.00 |
|
|
Total Coal Cost |
G = E*F |
Rs.lakhs |
20657.66 |
23377.09 |
|
3 |
Specific Oil
Consumption |
H |
ml/kWh |
2.78 |
2.5 |
|
|
Tota Oil
Consumption |
I = A*H |
kl |
6181 |
6225 |
|
|
Delivered Oil Price |
J |
Rs./kl |
39045.20 |
39045.20 |
|
|
Total Oil Cost |
K = I*J |
Rs.lakhs |
2413.43 |
2430.64 |
|
4 |
Coal Cost per Unit |
L = G/C |
Rs./kWh |
1.014 |
1.032 |
|
|
Oil Cost per Unit |
M = K/C |
Rs./kWh |
0.118 |
0.107 |
|
5 |
Total Fuel Cost per
unit |
O = L+M |
Rs./kWh |
1.132 |
1.139 |
|
|
Total Fuel Cost |
N = G+K |
Rs.lakhs |
23071.09 |
25807.74 |
|
The proposed variable/energy charges of
Rs.258.07 Crores and expected generation of 2265 MUs would
result in a energy tariff charge of Rs.1.139/kWh for FY
2009-10. The Petitioner requests the Honourable Commission
to kindly approve this. |
|