The document discusses integrating solar generation at a thermal power plant to reduce auxiliary power consumption (APC). It proposes mounting solar panels on building roofs and over water reservoirs. This could reduce APC by 1.14%, saving on fuel costs and increasing revenue. Other benefits include earning energy saving certificates, lowering tariffs, and reducing cooling water temperatures. The proposal outlines installing the solar system, potential locations for panels, and interconnecting to the grid and township. Key advantages are listed, along with considerations like maintaining panel efficiency and increased water usage.

1. Integration of solar generation for reduction
of Auxiliary Power Consumption (APC) in
Thermal Power plant
M. G. Morshad , ADGM / Electrical
TPS II ( 7 x 210MW) NLC India Ltd

2. Auxiliary Power Consumption (APC)
Auxiliary Power Consumption
(APC)
The MW power required to operate
the auxiliary equipment of the plant
Unit Auxiliary Consumption
(UAC)
The power drawn from own
generation for operating its
own loads (the auxiliary
equipment of Boiler , Turbine ,
Generator)
Station Auxiliary Consumption
(SAC)
The power drawn from Grid
for operating the common and
emergency loads of the plant
(Lighting, AC & Vent, Coal
Handling Plant etc.

3. Auxiliary Power Consumption
(Station consumption + Unit Consumption )
% Auxiliary consumption = x 100
(Total Generation )
Export in
MU/day
Import in
MU / Day
Unit Auxiliary
Consumption
in MU / Day

4. Parameters Formula MW Percentage
Total Generation G 1370 100.00 %
Unit Auxiliary consumption UAC 112 8.18%
Station Auxilary Consumption SAC 17 1.24%
Auxiliary Power Consumption APC = UAC + SAC 129 9.42%
Typical Auxiliary Power Consumption in any
thermal power plant
91%
8%
1%
Genertion & APC
Generation
UAC
SAC

5. Impact of APC on thermal power plant
 APC of any Coal & Lignite base thermal power plant varies
from 5 % to 10% depending upon capacity of the plant ,
Technology used and Fuel quality .
 APC gets further increased for complying with statuary
environmental norms for handling dry ash, emission of SOx,
NOx, SPM and effluent .
 As tariff increases with APC, selling out of energy to grid
through power treading becomes highly competitive with
higher APC.
 Energy feed to the bus (Total Generation – APC) decreases
with higher APC causing revenue loss.

6. Parameters Station Solar
Load MW 17 10
Capacity Utilization Factor (CUF) 100% 18%
Average load (MW) 17.00 1.80
Reduced load with solar generation (MW) 15.20 ***
Existing
With solar
generation
Parameters Formula MW Percentage MW Percentage
Generation MW 1370 100% 1370 100%
Unit Auxiliary consumption UAPC 112 8.18% 112 8.18%
Station Auxilary Consumption ASAPC 17 1.24% 15.2 1.11%
Total Auxilary consumption
APC = (UAPC +
SAPC)
129 9.42% 127.2 9.28%
Impact of integration of solar generation

7. Investment for solar plant as per CERC guideline
Investment required = Rs 5.01 Crore / MW

8. Capital cost Parameters Cr/MW 10 MW
PV Modules 3.10 31.019
Land Cost 0.25 0
Civil and General Works 0.35 0
Mounting Structures 0.35 1
Power Conditioning Unit 0.30 3
Evacuation Cost up to Interconnection Point (Cables and
Transformers)
0.40 4
Preliminary and Pre-Operative Expenses including Contingency 0.26 1
Total capital cost 5.01 40.02
Annual interest @ 10% *** 4.00
Annual depriciation @ 5.58% *** 2.23
Total Project cost *** 46.25
Annual cost @ 15 Years life *** 3.08
Investment for setting up 10 MW solar plant
inside thermal power plant

9. Parameters Formula Existing With solar
Gross Heat rate (Kcal/Kwhr) GHR 2845 2845
% APC %APC 9.42% 9.28%
Net Heat rate (Kcal/Kwhr) NHR = GHR /(1-% APC) 3140.73 3136.18
Annual generation (MU) MU = 1470X24x365x0.85 10945.62 10945.62
GCV Lignite Kcal/Kg) GCV 2650 2650
Lignite consumption (Ton) LC = HR x MUX1000/GCV 12972555.85 12953767.15
Lignite purchse cost (Rs/Ton) CP 2350 2350
Lignite consumption cost (Crore) LCC = LC x CP / 10000000 3,048.55 3,044.14
Annual Lignite Cost saving (Crore) LCC (Before - After) *** 4.42
Annual fuel saving due to integration of solar
generation

10. Annual generation (MU) MU = 1470X24x365x0.85 10945.62
Net Heat rate Before (Kcal/Kwhr) NHR 1 3140.73
Net Heat rate After (Kcal/Kwhr) NHR 2 3136.18
Energy Saving Certificate (Nos) ESC = (NHR 1-NHR2)X MU/10 4980.26
Cost per certificate (Rs) C 10000
Total cost (Crore) TC 4.98
Annual incentive (Crore) TC/3 1.66
Annual incentive in the form of Energy saving
certificate under PAT scheme

11. Parameters
Measuring
Units
Formula Norms Present
With Solar
Generation
Gross station heat rate Kcal/Kwhr GHR 2900 2845 2845
Specific fuel oil consumption ml/Kwhr SFC 2 2 2
Calorific value - Secondary fuel Kcal / ml CVSF 10 10 10
Landed price - Primary fuel Rs / Kg LPPF 2.35 2.35 2.35
Calorific value - Promary fuel Kcal / kg CVPF 2950 2950 2950
Auxiliary Power Consumption % AUX 10 9.42 9.28
Energy Charge rate (EC) Rs / Kwhr
EC = [(GHR - SFC X CVSF) X
LPPF/CVPF]X 100/(100-AUX)
2.563 2.499 2.495
Capacity Charges Rs / Kwhr CC 0.852 0.852 0.852
Energy Charges Rs / Kwhr EC 2.56 2.50 2.49
Tariff Rs / Kwhr CC + EC 3.415 3.351 3.347
Tariff reduction due to integration of solar
generation

12. Land availability for erection of solar panels
Thermal Solar Unit
Specific land requirement 0.3 7 Acre / MW
Plant Capacity 1470 10 MW
Total land requirement 441 70 Acre
Availability of land in thermal power plant Percentage Acre
Water reservoir 10% 44.1
Building area 2% 8.82
Coal handling area 8% 35.28
Total area available for erection of solar panel 88.2

13. 1. Roof top solar panels are to be mounted over all the
building available inside the plant premises
 Advantages –
 Reduce room temperature that lead to reduce power
consumption for AC & Ventilation system.
2. Floating type solar panels are to be arranged for water
reservoir.
 Advantages –
 Reduce evaporation loss of circulating water from lake that
leads to reduction in water consumption.
 Reduce CW temp during summer which can avoid load
reduction due high CW temp .
Mounting of solar panels

14. TG Hall
(Roof Top)
CW Pump
House
(Roof
Top)
Lake ( Floating Type)
AO Building
(Roof Top)
Canteen
(Roof Top)
ADPH
Stage I
(Roof
Top)
ADPH
Stage II
(Roof
Top)
Inverter
Arrangement of panels and evacuation of power
Energy
Meter
To
Township
Inverter
11KV Ring main Grid

15. Solar panels
String
combined Box
DC to AC
Inverter
Solar panels
String
combined Box
DC to AC
Inverter
HT Switcher
Gear
380/11KV
11KV Ring main Grid
System Arrangement

16. Advantages
1. Fuel cost saving
2. Pumping of more energy to grid due to lower APC which can
fetch additional revenue
3. Earning Energy saving certificate under PAT scheme due to
reduction in Net Heat rate
4. Evacuation of excess generation through power treading
becomes less competitive due to lower tariff
5. No erection of separate switchyard .
6. No additional establishment cost
7. Excess solar generation can be pumped to Township grid
8. Floating panels over lake will reduce the CW temp during
summer and therefore load reduction due to poor condenser
vacuum can be avoided.
9. Roof top panels will reduce the room temperature that lead to
reduce AC & Ventilation consumption.

17. Points to be taken into consideration for implement
this project.
1. Water sprinkler system to be installed to keep the panels free
from dry ash deposition and increasing efficiency of the PV
cell due to cooling
2. About 200KW is required to operate water sprinkler system
3. Raw water consumption will be increased
4. Investment should be under the head of energy conservation
not as capital investment for asset
Thank You