| Residential Photovoltaic Installation
Viability |
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| Silicon
Valley Power - City of Santa Clara |
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| http://www.siliconvalleypower.com/res/?sub=resrates |
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| http://www.siliconvalleypower.com/pdf/2009_Rates_D1TOU.pdf |
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| http://www.siliconvalleypower.com/pdf/InterconnectionAgreementForm0108.pdf |
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Peak
is Mon-Sat, 6am - 10pm |
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| Domestic
Service D-1 |
Non-time-of-use |
Time-of-Use Peak |
Time-of-Use Off-Peak |
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| Rates
per KWH |
|
first 300 KWH /mo |
over
300 KWH /mo |
first
300 KWH /mo |
over
300 KWH /mo |
first
300 KWH /mo |
over
300 KWH /mo |
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| Energy
Charge |
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$0.07753 |
$0.08913 |
$0.08920 |
$0.10080
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$0.06798 |
$0.07958 |
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| Public Benefits Charge |
$0.00221 |
$0.00254 |
$0.00254 |
$0.00287 |
$0.00194 |
$0.00227 |
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| State
Surcharge |
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$0.00020 |
$0.00020 |
$0.00020 |
$0.00020 |
$0.00020 |
$0.00020 |
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| Total
Charge |
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$0.07994 |
$0.09187 |
$0.09194 |
$0.10387
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$0.07012 |
$0.08205 |
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| Electric
Bill including surcharges (not including meter charges) without PV |
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Energy Used (KWH) |
Cost of first 300
KWH |
Cost of >300
KWH |
Total Energy Cost |
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| Jan |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Feb |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Mar |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Apr |
500 |
$23.98 |
$18.37 |
$42.36 |
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| May |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Jun |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Jul |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Aug |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Sep |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Oct |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Nov |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Dec |
500 |
$23.98 |
$18.37 |
$42.36 |
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| Total |
6000 |
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$508.27 |
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| Assumptions: |
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| Panels
face West, tilted 30 degrees from horizontal |
System
Cost |
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$32,000 |
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| System Size (KW) |
4 |
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Federal
Tax Credit |
30% |
($9,600) |
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| Cost per W |
$8.00
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Utility
Rebate $/W |
$3.75 |
($15,000) |
http://www.siliconvalleypower.com/res/?sub=rebatessolar |
| PV Output adjustment |
-10% |
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Net
System Cost |
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$7,400 |
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| Electric
Bill including surcharges (not including meter charges) with PV |
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Energy Generated
by PV (KWH) |
Energy Used (KWH) |
Energy Billed
(KWH) |
TOU Peak Billed |
Utility TOU Bill
Savings |
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non-TOU Billed $ |
Utility non-TOU
Bill Savings |
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| Jan |
214 |
500 |
286 |
$26.29 |
$16.06 |
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$22.86 |
$19.49 |
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| Feb |
308 |
500 |
192 |
$17.65 |
$24.70 |
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$15.35 |
$27.01 |
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| Mar |
412 |
500 |
88 |
$8.09 |
$34.27 |
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$7.03 |
$35.32 |
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| Apr |
541 |
500 |
-41 |
($3.77) |
$46.13 |
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($3.28) |
$45.63 |
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| May |
634 |
500 |
-134 |
($12.32) |
$54.68 |
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($10.71) |
$53.07 |
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| Jun |
680 |
500 |
-180 |
($16.55) |
$58.91 |
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($14.39) |
$56.75 |
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| Jul |
711 |
500 |
-211 |
($19.40) |
$61.76 |
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($16.87) |
$59.22 |
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| Aug |
624 |
500 |
-124 |
($11.40) |
$53.76 |
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($9.91) |
$52.27 |
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| Sep |
530 |
500 |
-30 |
($2.76) |
$45.11 |
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($2.40) |
$44.75 |
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| Oct |
377 |
500 |
123 |
$11.31 |
$31.05 |
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$9.83 |
$32.52 |
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| Nov |
233 |
500 |
267 |
$24.55 |
$17.81 |
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$21.34 |
$21.01 |
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| Dec |
192 |
500 |
308 |
$28.41 |
$13.94 |
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$24.72 |
$17.64 |
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| Total |
5456 |
6000 |
544 |
$50.11 |
$458.16 |
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$43.58 |
$464.69 |
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Simple payback period
(years) |
16.2 |
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15.9 |
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| Financing |
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Closing cost |
$0 |
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Principal |
$7,400 |
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Years |
30 |
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Interest rate |
5% |
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Mo. payment |
($37.49) |
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Annual pymt |
($449.94) |
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Annual Savings during loan period |
$8.22
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