Describes about the economic viability of a proposed street lighting system

1. DEPARTMENT OF INDUSTRIAL AND PRODUCTION ENGINEERING
SHAHJALAL UNIVERSITY OF SCIENCE &TECHNOLOGY, SYLHET
Technical and Economic Viability of A
Proposed Solar Street Lighting System for
SUST
Paper ID_30
Authors name:
1. Md. Rabiul Hasan
2. Muhammad M. Hasan
3. Ranjit Biswas
4. Md. Masum Parvej

2. Background of the study :
 The population of Bangladesh is about 161 million people and have
present Installed Generation Capacity of electricity (including captive power
installment capacity) is 15,379 MW till 01 February, 2017 ((BPDB), 2017).
 But at present, only 42% of the total population is connected with national
grid (F. Ahammed, 2013).
 The forecasted power demand in Bangladesh is 34,000MW by 2030.
 In 2010, the total amount of natural gas that has been applied to the
power generation which was about 60% (Finance division, 2011).
 In Bangladesh, 60% of customers purchased solar panel within $125 to $250
USD.
 70% people purchased solar panel through bank loan or from any other loan
provided by NGO (non-government organization) (M.F. Hossain, 2017).
 According to the circulation of Bangladesh bank, all commercial banks and
financial institutions invest 5% of their total investment in green banking
sector (M.M. Ullah, 2014).
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3. Background of the study :
The component of the solar street system is photovoltaic solar panel, a
storage battery, a battery charging controller, and end-use equipment like
LED (Light Emitting Diode) lamps etc.
 S. Sowe et al. (2014) investigated on the economic viability of a c-Si
module based solar system and found that the IRR, PBP, BCR are 9%, 8.35
years, 1.82 respectively [Sowe et al., 2014].
 Only financial analysis is not sufficient to appreciate the energy
investment.
 Environmental factor should also be incorporated [Mondal M.A.H., 2010].
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4. RESEARCH METHODOLOGY 3
Selection of research areas
Identifying the data sources
Data collection for SSLS SUST campus
and from different company
Analysis with RETscreen and
Microsoft excel software
Findings of the study
Theory and literature
(previous results)
Causation and explanation
Conclusion and
recommendations

5. SOLAR STREET LIGHTING SYSTEM FOR SUST
 In a PV model where the sun light is converted into electricity. For the solar
street lighting system, the existing electric polls containing the lamps are
calculated in the SUST campus.
Category Numbers Serving capacity
Energy bulb 32 23 watt
Tube-light 111 40 watt (avg.)
Flash light 8 50 watt
Total 151
4Result and
discussion
Contd.

6. Overall system specification
 For this research work, one solar electric polls is considered as standard to
analyze for the whole street lighting in the university campus area.
 For getting the appropriate component set up, the required energy, battery
size, capacity of the LED lights are calculated.
Required feature Capacity Quantity
Panels 150 W 1
Charge controller 10 A 1
Battery 72 AH 1
Bulb 20 W 2
5Result and
discussion
Contd.

7. Cumulative cash flow
-30,000
-20,000
-10,000
0
10,000
20,000
30,000
40,000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
CumulativeCash
Number of years
Result and
discussion
Contd.
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8. saving income summary.
Financial viability
Pre-tax IRR – equity 7%
Pre-tax IRR – assets 7%
After-tax IRR – equity 7%
After-tax IRR – assets 7%
Equity payback Year 13.6
Annual life cycle savings BDT/year 1427
Benefit-Cost (B-C) ratio 2.60
Net present value BDT 35685
7Result and
discussion
Contd.

9. Emission analysis
Only financial analysis is not adequate to fully appreciate energy investments, the
analysis is needed to take into account the environmental benefits as well.
 The financial analysis does not take into account the long term impact on
driving vehicles due to good street light.
 The grid electricity mostly produced by the natural gas in Bangladesh. For this
research work, natural gas is replaced by the dc solar electric system.
 For each MWh electricity, 0.578 tone 𝐶𝑂2 is decreased. The proposed system,
each solar street light can reduce 100 Kg of 𝐶𝑂2 emission in a year.
8Result and
discussion
Contd.

10.  There is a shortage of energy everywhere in the world. More and more energy
sources is searched to fulfill the demand. In this point of view renewable
energy like the solar energy can play a vital role. From the analysis, it is
found that the proposed project is found cost effective. But in case of large
scale, it can be more cost effective. Moreover, the financial analysis, does not
take the social and environmental factors for the investors. For this reason,
the project is also estimated to reduce the greenhouse gas emission in the air
which is important for the environmental issues.
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Conclusion:

11. THANK YOU
ALL