Smart Buildings Systems for Architects, Owners and Builders

per square foot or $1.3 million in energy costs. In the first year after ESCO,
annual energy consumption dropped to 21.2 kilowatt hours per square foot,
or $986,220 in total energy costs, generating savings of $313,780. In the second
year, annual energy consumption declined to 20 kilowatt hours per square foot
and generated accumulated savings of $402,612 (Figs. 18.5 and 18.6).

35

30

33

Energy

Use before

ESCO

Energy

Savings

over Two

Years

Savings over Two Years

Energy Use

Energy

Use After

Two Years

19.7

13.3

25

20

Energy Use (kWH)

15

10

5

0

Figure 18.4 Wainwright Office Building reduction in energy costs after two
years.

Fees to ESCO

One time cost on a per sq. ft. basis

Guaranteed Annual Savings for energy per sq. ft.

Guaranteed Annual Savings for operations per sq. ft.

Simple Payback for energy in years

Simple payback for operations in years

Total Payback in Years

Number of square feet of State facilities addressed

$18,000,000

$1.10

$0.17

$0.40

6.5

2.8

1.9

16,336,715

Figure 18.3 Wainwright Office Building reduction in energy consumption
after two years.

Case Studies 211