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In 2012, Louisville had 312 residential solar installations (4% of all Louisville homes). <br />Production data from these installations was estimated to be 3,954 MWh13. There were also 672 <br />residential customers (8 %) purchasing electricity from Xcel's Windsource® program totaling <br />2,461 MWh4. These figures combine for a GHG savings of 5,000 mt -0O2e, based on Xcel's <br />emission factor of 0.78 kg -0O2e / kWh. These savings were figured into the building sector total <br />emission inventory. <br />Additionally, three Government owned water treatment facilities (2000 Washington, 7000 <br />Marshall, and 1600 Spruce) have photovoltaic installations. Combined, they produced a total of <br />489 MWh in 201213, translating to a total GHG savings if 380 mt -0O2e, or 13% of total water <br />treatment related emissions, based on Xcel's emission factor of 0.78 kg -0O2e / kWh. These <br />savings were figured into the building sector total emission inventory. The cost savings provided <br />by these systems totals approximately $19,500 annually, with a pay -back period of 12- 20 years <br />depending on projected energy cost inflation rates13. Cost estimation is based on an electricity <br />price of $.04 / kWh per Dave Szabados. <br />3,000 <br />2,500 <br />2,000 <br />G? <br />can <br />1,500 <br />1,000 <br />I) 500 <br />W <br />Figure 2. Electricity Use at Water <br />Treatment Facilities <br />1600 Spruce /i6oi 2000 Washington 7000 Marshall Rd <br />Empire unit B <br />From Solar <br />From Grid <br />6.1.2 Water <br />In 2012, 33 million gallons of reuse wastewater was used to irrigate ball fields, golf courses, <br />and parks13, leading to an energy savings of approximately 54,000 kWh and 307 therms and <br />approximately $2,000 in avoided cost of water treatment. These in turn lead to emissions savings <br />24 <br />26 <br />