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On the squad garage roof, we could install approximately 552 panels, which equates to a 93 kW solar
<br />photovoltaic array. We got a quote for $204,600 to provide and install that array to the City. This
<br />amount of power only covers a portion of the power needs for the building, so we don't expect to be
<br />putting much power back into the grid unless you want to.
<br />The annual cost savings on your electricity bill is a moving target since rates increase over time and the
<br />solar panels will degrade slowly, but it starts at $6,500 a year. We've provided a basic forecast model
<br />below (which makes assumptions about production loss and rate increases but does not factor in
<br />inflation) that shows the system will pay for itself sometime during the 241" year. The panels have a 30-
<br />year service life, but it's not like they shut off at that point, they just aren't making quite as much power.
<br />It makes sense to replace the panels when you replace the roof.
<br />Let us know if you have any questions.
<br />Year
<br />Annual Generation
<br />(kWh) (.5% loss per
<br />year)
<br />Rate (estimated 3%
<br />annual increase)
<br />Savings to energy bill
<br />Cumulative Savings
<br />1
<br />100,000
<br />$0.0651
<br />$6, 510.00
<br />$6, 510.00
<br />2
<br />99,500
<br />$0.0671
<br />$6, 671.77
<br />$13,181.77
<br />3
<br />99,003
<br />$0.0691
<br />$6, 837.57
<br />$ 20, 019.34
<br />4
<br />98,507
<br />$0.0711
<br />$7,007.48
<br />$27,026.82
<br />5
<br />98,015
<br />$0.0733
<br />$7,181.62
<br />$34, 208.44
<br />6
<br />97,525
<br />$0.0755
<br />$7,360.08
<br />$41,568.52
<br />7
<br />97,037
<br />$0.0777
<br />$7,542.98
<br />$49,111.50
<br />8
<br />96,552
<br />$0.0801
<br />$7,730.42
<br />$56,841.92
<br />9
<br />96,069
<br />$0.0825
<br />$7,922.52
<br />$64,764.44
<br />10
<br />95,589
<br />$0.0849
<br />$8,119.40
<br />$72, 883.83
<br />11
<br />95,111
<br />$0.0875
<br />$8,321.16
<br />$81, 205.00
<br />12
<br />94,635
<br />$0.0901
<br />$8,527.94
<br />$89,732.94
<br />13
<br />94,162
<br />$0.0928
<br />$8,739.86
<br />$98,472.80
<br />14
<br />93,691
<br />$0.0956
<br />$8,957.05
<br />$107,429.85
<br />15
<br />93,223
<br />$0.0985
<br />$9,179.63
<br />$116,609.49
<br />16
<br />92,757
<br />$0.1014
<br />$9,407.75
<br />$126,017.23
<br />17
<br />92,293
<br />$0.1045
<br />$9,641.53
<br />$135,658.76
<br />18
<br />91,832
<br />$0.1076
<br />$9,881.12
<br />$145,539.88
<br />19
<br />91,372
<br />$0.1108
<br />$10,126.67
<br />$155,666.55
<br />20
<br />90,916
<br />$0.1142
<br />$10,378.31
<br />$166,044.86
<br />21
<br />90,461
<br />$0.1176
<br />$10,636.21
<br />$176,681.07
<br />22
<br />90,009
<br />$0.1211
<br />$10,900.52
<br />$187,581.60
<br />23
<br />89,559
<br />$0.1247
<br />$11,171.40
<br />$198,753.00
<br />24
<br />89,111
<br />$0.1285
<br />$11,449.01
<br />$210,202.01
<br />
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