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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 2004-05
and FY 2005-06, the Honourable Commission had allowed specific
consumption of coal at 0.56 kg/kWh based on the normative heat
rate of 2500 kcal/kWh, as per Honourable Commission’s
regulations on Terms and Conditions for Determination of Thermal
Generation Tariff dtd. 28th July 2004 while the
actual specific consumption of coal was 0.7 kg/kWh and 0.69
kg/kWh for FY 2004-05 and FY 2005-06
and heat rates were 2946 kCal/kWh and 2958 kCal/kWh for the two
years respectively. 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 all-India average
specific consumption of coal as per CEA’s Review of Performance
of Thermal Power Stations (2005-06) the all India for FY 2005-06
was 0.7 kg/kWh and for Eastern region as a whole it was 0.72
kg/kWh. However, the Honourable Commission approved only a
normative specific consumption of coal of 0.56 kg/kWh. TTPS is
incurring heavy loss due to low specific consumption allowed by
the Honourable Commission.
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.
Due to the number of
tripping of transmission lines and lack of load the generating
units are backed down resulting in frequent shutting down and
start ups. This impacts the fuel and plant efficiency adversely.
The actual specific consumption of coal and heat rate were 0.656
kg/kWh and 2821 kCal/kWh even when PLF was comparatively higher
in FY
2006-07. In FY 2007-08 due to breakdown
maintenance of one unit the plant PLF will be much lower and the
Petitioner expects at best to retain the lower level of specific
coal consumption of 0.656 kg/kWh and heat rate of 2821 kCal/kWh
of FY 2006-07. The Petitioner therefore requests the Honourable
Commission to approve 0.656 kg/kWh as specific consumption of
coal and heat rate 2821 kCal/kWh for the FY 2007-08.
The Petitioner requests the Honourable
Commission to consider the actual heat rate observed by the
Petitioner in its generation plant.
Table 25: Projected Specific Coal Consumption & Heat Rate for
FY’07
|
Year |
Specific Coal Consumption (%) |
Heat Rate (kCal/kWh) |
|
2007-08 |
0.656 |
2821 |
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 1% of coal
transported. However, the Honourable Commission approved only
the normative 0.8% of coal transported. TVNL requests the
Honourable Commission to allow 1% of total coal transported
towards transit loss in FY 2007-08.
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) |
|
2005-06 |
3.90 |
|
2006-07 |
2.31 |
|
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. However the Petitioner has taken initiative to
reduce the specific oil consumption to 2.31 ml/kWh in FY
2006-07. The Petitioner shall endeavor to maintain
specific oil consumption at FY 2006-07 level and requests
the Honourable Commission to allow 2.31 ml/kWh during the
FY 2007-08.
The cost of coal billed by CCL in FY 2006-07
was Rs.1097.89/MT and the transport cost by road is
Rs.160.85/MT resulting in a delivered cost of coal at the
thermal station at Rs.1258.73/MT. Assuming a modest 5%
increase in the cost of coal and transport the estimated
cost per MT is projected at Rs.1321.67/MT for the year
2007-08.
The
delivered cost of oil at the thermal station by the oil
companies is Rs.27835/KL during the year 2006-07 as
compared to Rs.20555/kl in 2004-05 registering an increase
in prices at a CAGR of 16.4%. Assuming a modest 10%
increase the oil price is estimated at Rs.30619/KL for the
year 2007-08
The cost
of coal and oil consumption based on the estimated prices
for FY 2007-08 indicated above and the coal and
consumption worked against the projected electricity
generation results in an aggregate fuel cost of 158.90
crores for FY 2007-08 as detailed
in the Table 27 below:
Table
27: Variable Cost
|
S.No |
Item |
Derivation |
Unit |
2006-07
(Actual) |
2007-08
(Proposed) |
|
1 |
Installed Capacity |
IC |
MW |
420 |
210 |
|
|
PLF |
PLF |
% |
73.80% |
50.34% |
|
|
Generation |
A = IC*PLF*8.76 |
MU |
2715 |
1679 |
|
|
Auxiliary Consumption |
B |
% |
12.00% |
12.00% |
|
|
Net Generation |
C = A*(1-B) |
MU |
2389.31 |
1477.52 |
|
2 |
Specific Coal
Consumption |
D |
kg/kWh |
0.656 |
0.656 |
|
|
Total Coal Consumption |
E = A*D*1000 |
MT |
1781571 |
1101424 |
|
|
Total Consumption
Including Transit Losses |
E’’ = E*1.01 |
MT |
1799387 |
1112438 |
|
|
Delivered Coal Price |
F |
Rs./MT |
1258.73 |
1321.67 |
|
|
Total Coal Cost |
G = E*F |
Rs.lakhs |
22649.42 |
14702.72 |
|
3 |
Specific Oil
Consumption |
H |
ml/kWh |
2.31 |
2.31 |
|
|
Total Oil Consumption |
I = A*H |
Kl |
6269 |
3878 |
|
|
Delivered Oil Price |
J |
Rs./kl |
27835 |
30618.50 |
|
|
Total Oil Cost |
K = I*J |
Rs.lakhs |
1744.98 |
1187.54 |
|
4 |
Coal Cost per Unit |
L = G/C |
Rs./kWh |
0.948 |
0.995 |
|
|
Oil Cost per Unit |
M = K/C |
Rs./kWh |
0.073 |
0.080 |
|
5 |
Total Fuel Cost |
N = G+K |
Rs. lakhs |
24394.40 |
15890.26 |
|
|
Total Fuel Cost per
Unit |
O = L+M |
Rs./kWh |
1.021 |
1.075 |
The proposed variable/energy charges of
Rs.158.90 crores and expected generation of 1679 MUs would
result in a energy tariff charge of Rs.1.075/kWh for FY
2007-08. The Petitioner requests the Honourable Commission
to kindly approve this.
|
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