A 100 kW solar array located in Cheney, WA is estimated to produce 126,000 kWh.  Assuming electricity produced from the solar is free ($0.00 / kWh), how much would the building save on annual electricity costs?

Glencoe Physics: Principles and Problems, Student Edition
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Author:Paul W. Zitzewitz
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Chapter22: Electric Current
Section: Chapter Questions
Problem 93A
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A 100 kW solar array located in Cheney, WA is estimated to produce 126,000 kWh.  Assuming electricity produced from the solar is free ($0.00 / kWh), how much would the building save on annual electricity costs?

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In Cheney WA the average residents electric charges are 6cents/kWh of electricity. 

And as given that the solar array produces 126000kWh of electricity so the net cost saved will be:

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