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Solar Energy in Schools:Benefits & Examples21st Nov, CII Green Building Congress
Kanika KhannaDirector
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Generation Matches Consumption
Typical Load Cycle for a School
St. Mary’s School, Delhi Non AC Connected load: 100 kW 1.6 acre built up area 2500 students
Daily consumption: 318 unitsMonthly Bill: 86,000
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Load Consumption kW Apr
Typical Load Cycle for a School
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Load Consumption kW Apr
SolarSt. Mary’s School, Delhi Non AC Connected load: 100 kW 1.6 acre built up area 2500 studentsAdd 50 kW Solar plant
Daily consumption: 318 unitsMonthly Bill: 86,000
Daily consumption:318 24 unitsMonthly Bill: 6,500
St. Mary’s School, Delhi Non AC Connected load: 100 kW 1.6 acre built up area 2500 studentsAdd 50 kW Solar plant
Typical Load Cycle for a School
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Load Consumption kW Apr
-47-16
87
Typical Load Cycle for a School
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Units
(kW
h)
The Indian School Year 2012 Billed Units
Year 2013 Billed Units
Year 2014 Billed Units
Year 2015 Billed Units
The Indian School, Delhi Non AC Connected load: 110 kW 2 acre built up area 2200 students
-5,000
0
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The Indian School Year 2012 Billed Units
Year 2013 Billed Units
Year 2014 Billed Units
Year 2015 Billed Units
Typical Load Cycle for a School
The Indian School, Delhi Non AC Connected load: 110 kW 2 acre built up area 2200 students Add 70 kW Solar
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The Indian School Year 2012 Billed UnitsYear 2013 Billed UnitsYear 2014 Billed UnitsYear 2015 Billed UnitsPredicted Solar Output
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The Indian School Year 2014 Billed Units
Predicted Solar Output
Post Solar Consumption
Typical Load Cycle for a School
The Indian School, Delhi Non AC Connected load: 110 kW 2 acre built up area 2200 students
Annual consumption: 1,50,000 21,000 units
Safeguard Against Increasing Tariffs
Grid tariffs are hiked each year, as subsidies are removed from coal based electricity. Expect grid electricity
bills to double in 4 years Solar power provides an
opportunity to freeze and eventually eliminate electricity bills.
Sample graph for total effective grid tariffs
4.00
6.00
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10.00
12.00
14.00
Nov-10 Apr-12 Aug-13 Dec-14 May-16 Sep-17
17% CAGR
Quick Returns
Sardar Patel Vidyalaya, Delhi
Quick Returns
-30,00,000
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-10,00,000
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70,00,000
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
Cumulative Cash Flow
Sardar Patel Vidyalaya, Delhi Non AC Connected load: 96 kW 30 kW solar plant 10 year IRR = 21%
Time of Day Benefit
-94-33
The Indian School, Delhi Non AC Connected load: 110 kW 2 acre built up area 2200 students
Mitigate Need for Load Expansion
The Indian School, DelhiAdded few classroomsNeeded additional load of 40 kW Avoided load expansion by adding 70 kW solar to support peak loads Saved on fixed demand charges
Reduce Diesel Consumption
Schiller School, Ghaziabad Non AC Connected load: 110 kW 2 acre built up area 2200 students
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Diesel Genset-Cummins 200 kVA
Solar
71 89150
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Diesel Genset-Cummins 200 kVA
Solar
After Solar
Reduce Diesel Consumption
Schiller School, Ghaziabad Non AC Connected load: 110 kW 2 acre built up area 2200 students Add 50 kW Solar
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Connected Load
Diesel Consumption- Schiller School
Load
With Solar
Efficiency Curve28 lt/ hr
15 lt/ hr
Reduce Diesel Consumption
With the use of solar:Diesel load goes down from 100 kVA to 60 kVA.consumption becomes half: from 28 lt/hr to 15 lt/hrDaily diesel consumed reduces from 100 + lt/ day to 60 lt/day.
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Diesel Consumption- Schiller School
Load
With Solar
Efficiency Curve28 lt/ hr
15 lt/ hr
Reduce Diesel Consumption
Schiller School, GhaziabadDaily Savings of 40 lts or Rs 2,500Additional 160 units from gridUsed to procure 200 lts of diesel every 2nd day, now will need to procure every 4th day
Energy Access
Govt. School, Haryana
Energy Access
Chandu Govt School, Haryana Only 50 kms from DelhiExtensive power outages upto 12 hours DG provided by Govt but no diesel Added 2 kW plant Runs all fans and lights
Set an Example
St Mary’s School, Delhi
Set an Example
Manav Rachna School, Ggn
Cooler Classrooms
The Indian School, Delhi
