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1) Source: US EIA 2003 Commercial Building Energy Consumption Survey and US DOE 2009 NREL Commercial Building Benchmark Models 2) 30 and 50 yr savings represents the cumulative energy and maintenance savings minus the initial cost of the investment 3) Second number anticipates the payback when using third -party financing "Simple payback period" is the initial capital outlay divided by the annual savings, neither one being adjusted for inflation or the cost of money (discount rate). For the geothermal alternate, this would happen in 24.4 years. For the LED alternate, 10.1 years. "Break -even point" is where the Net Present Value (NPV ) becomes positive, which includes both the discount rate and annual inflation in order to better represent future costs and their present value. For the geothermal alternate, this occurs in 24.4 years. For the LED alternate, 14 years. Payback period can also be calculated by determining when the cumulative future savings finally equal the initial capital outlay, taking into account the annual inflation in utility and maintenance costs but not the cost of money. For the geothermal alternate, this would happen in 16.4 years. For the LED alternate, 13 years. 0 ff Alwo—My S% s MOSELEYARCHI TECTS AF G -3 Page 148 Annual Simple Energy Use Energy Cost Payback Intensity in $ /SF Initial Cost of Period Total Savings Total Savings (EUI) (ECI) Investment (yrs) (30 yr) z (50 yr) z Average Elementary School in SE U5 76.9 $1.84 CCS Average, 2009 -2010 62.5 $1.49 CCS Average, 2013 -2014 L 49.8 $1.19 n/a Lancaster ES (Prototype Basis) 55.0 $1.31 NC Energy Code Baseline 44.0 $1.08 Odell 3 -5 Elementary School - Base Bid 30.5 $0.70 $238,467 7.1 $1,986,371 $6,771,969 - with LED Alternate [ 30.2 $0.70 $40,500 10.1 $385,525 $992,905 - with Geothermal Alternate 23.4 $0.56 $524,000 24/32 3 $819,295 $3,850,993 1) Source: US EIA 2003 Commercial Building Energy Consumption Survey and US DOE 2009 NREL Commercial Building Benchmark Models 2) 30 and 50 yr savings represents the cumulative energy and maintenance savings minus the initial cost of the investment 3) Second number anticipates the payback when using third -party financing "Simple payback period" is the initial capital outlay divided by the annual savings, neither one being adjusted for inflation or the cost of money (discount rate). For the geothermal alternate, this would happen in 24.4 years. For the LED alternate, 10.1 years. "Break -even point" is where the Net Present Value (NPV ) becomes positive, which includes both the discount rate and annual inflation in order to better represent future costs and their present value. For the geothermal alternate, this occurs in 24.4 years. For the LED alternate, 14 years. Payback period can also be calculated by determining when the cumulative future savings finally equal the initial capital outlay, taking into account the annual inflation in utility and maintenance costs but not the cost of money. For the geothermal alternate, this would happen in 16.4 years. For the LED alternate, 13 years. 0 ff Alwo—My S% s MOSELEYARCHI TECTS AF G -3 Page 148