Feb -0 7 May -07 Aug -07 Nov -0 7 Feb -08 May -08 Aug -08 Nov -08 Feb -0 9 May -09 Aug -0 9 Nov -09 Feb -10 May -10 Aug-10 Nov-1 0 Feb-11 May -11 Aug-11 Nov -11 Feb-12 May -12 Aug-12 Nov -12 0 50,000 100,000 150,000 200,000 250,000 300,000 SBHS: Monthly Electricity Usage On-Peak kWh Off-Peak kWh Cooling Degree Days Electricity (kWh) Now it is fixed. Fe Ap Ju Au Oc De Fe Ap Ju Au Oc De Fe Ap Ju Au Oc De Fe Ap Ju Au Oc De Fe Ap Ju Au Oc De Fe Ap Ju Au Oc De 0 5,000 10,000 15,000 20,000 25,000 SBHS: Monthly Gas Usage Therms Heating Deg Days Gas Use (therms) BILL ANALYSIS
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Feb-07
Apr-07
Jun-07
Aug-07
Oct-07
Dec-07
Feb-08
Apr-08
Jun-08
Aug-08
Oct-08
Dec-08
Feb-09
Apr-09
Jun-09
Aug-09
Oct-09
Dec-09
Feb-10
Apr-10
Jun-10
Aug-10
Oct-10
Dec-10
Feb-11
Apr-11
Jun-11
Aug-11
Oct-11
Dec-11
Feb-12
Apr-12
Jun-12
Aug-12
Oct-12
Dec-12
0
50,000
100,000
150,000
200,000
250,000
300,000
300
SBHS: Monthly Electricity Usage On-Peak kWh Off-Peak kWh Cooling Degree Days
Elec
trici
ty (k
Wh)
Cool
ing
Degr
ee D
ays
Now it is fixed.
Feb-07
Apr-07
Jun-07
Aug-07
Oct-07
Dec-07
Feb-08
Apr-08
Jun-08
Aug-08
Oct-08
Dec-08
Feb-09
Apr-09
Jun-09
Aug-09
Oct-09
Dec-09
Feb-10
Apr-10
Jun-10
Aug-10
Oct-10
Dec-10
Feb-11
Apr-11
Jun-11
Aug-11
Oct-11
Dec-11
Feb-12
Apr-12
Jun-12
Aug-12
Oct-12
Dec-12
0
5,000
10,000
15,000
20,000
25,000
0
500
1,000
1,500
2,000
SBHS: Monthly Gas Usage Therms Heating Deg Days
Gas U
se (t
herm
s)
Heati
ng D
egre
e Da
ys
BILL ANALYSIS
RETRO-COMMISSIONINGBENCHMARKING
• Note, this case is extreme but it’s not alone.• It’s roughly 2.5 times the average use and cost.
1 -
MS
2 - E
lem
4 - E
lem
6 -
M
S
8 -
K-1
2
10
- H
S
12 -
Ele
m
14
- H
S
16 -
Ele
m
18
- H
S
20 -
Ele
m
22
- H
S
24 -
Ele
m
26 -
Ele
m
28
- M
S
30 -
Ele
m
32 -
Ele
m
34 -
Ele
m
36 -
Ele
m
38 -
Pre
-K
40 -
Ele
m
42
- H
S
43
- H
S
46 -
Ele
m
0
50
100
150
200
250
0
0.5
1
1.5
2
2.5
3
3.5SEDAC Illinois K-12 School Energy Use
IntensitiesGas kBtu/sf Electric kBtu/sf $/sf
kBtu
/sf-
yr
$/s
f
'09-'10
'08-'09
'10-'11
Only consider renewables after implementing all of the previous ideas
The cost per unit energy saved of high efficiency equipment and improved design is less than the cost per unit of energy of wind or solar
Renewables do, however, make great marketing and educational opportunities and can be more affordable when incentives are available
EXTRA CREDIT: RENEWABLES
4
Renewables:
• Plan the infrastructure now for future
• Select site-appropriate technologies
• Use to take last step to net-zero
EXTRA CREDIT
Savings from renewables not shown in savings table
3 kW solar array funded through ICECF
Program to put panels on all schools
This site does not have sufficient wind resources to consider educational level turbine
CASE STUDY RENEWABLES
Total Incremental Cost $546,120
Incentives $340,508
Final Incremental Cost $205,612
Annual Utility Savings w/o solar $33,037
Simple Payback 6.2 years
IRR (5% acceptable) 10.3%
Net Present Value (10 yr, 5%) $53,952
CASE STUDY SUMMARY
07/08 08/09 09/10 10/11 11/12 -
20.0
40.0
60.0
80.0
100.0 91.0 92.5 80.3
19.7
43.5 39.7
Energy Use Intensity
07/08 08/09 09/10 10/11 11/12 12/13
STRATEGY SUMMARYForm & Environment
1. Orientation & Form
2. Insulation
3. Air Sealing
Loads
4. Lighting
5. Loads
Heating, Ventilating, & Air Conditioning
6. Heating
7. Cooling
8. Motors & Pumps
9. Building Automation
10. Commissioning
How SEDAC can help with new construction… Design Assistance
Public sector Private sector
Incentive Review Public Sector
Services are funded by DCEO or Utility at no charge to the project or owner
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