Gilbert, Arizona Neely Solar Facility Wastewater Treatment Committee Annual Seminar Optimizing Wastewater Treatment for the New Normal

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1 Gilbert, Arizona Neely Solar Facility 2015 Wastewater Treatment Committee Annual Seminar Optimizing Wastewater Treatment for the New Normal

2 Solar Project Location Neely Recharge Facility Western Canal Neely WRP

3 Project Design Details Public/Private Partnership Located at Gilbert s Neely Recharge Facility System Size: 2 mega-watts (2,257.92kW DC) 8000 solar panels - single axis tracker system Arrays are constructed over 5 recharge basins Solar panels are mounted on beams installed 20 feet underground and having a height clearance of 6½ feet above ground 5 inverters mounted on concrete pads - the inverters convert solar energy to electricity Solar system will help supply power to the Neely Wastewater Reclamation Plant

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6 Project Evolution Initial concept discussions about the solar project began with Severn Trent Services, Gilbert staff and SPG Solar in June, 2010 Gilbert applied for a renewable energy incentive (Credit Purchase Agreement) through APS in August, 2010 for the proposed project Gilbert was notified by APS that the project had been selected to receive a renewable energy incentive in September, 2010 The APS CPA (incentive) provides a 60% contribution towards project construction in exchange for renewable energy credits A Land License Agreement and Power Purchase Agreement (PPA) were negotiated and approved by the Gilbert Council in November, 2010 Project design began in December, 2010 followed by construction activity beginning in February through October, 2011 The system Interconnection and Operating Agreements with APS were approved in August, 2011 The system began producing power at the end of September, 2011

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9 Power Purchase Agreement Sun-Edison (Formally SPG Solar) Was required to perform project design and construction, also responsible for system operation and maintenance throughout agreement term Sun-Edison (formally Integrys Energy) is the solar system owner (Investor) while Gilbert is considered the system host PPA has a 20 year term with options at the end for either agreement renewal, ending the agreement with system removal (at owner s cost), or Gilbert can purchase the system at a depreciated value PPA requires Gilbert to purchase all of the power generated by the solar system at a fixed rate structure The solar power rate is anticipated to be at or less than the electrical power rate Gilbert would otherwise pay APS Forecasted savings for Gilbert is estimated to be approximately $2 million over the agreement term (20 years)

10 Gilbert - Neely Solar Project Forecasted Savings & Cash Flow Summary PPA Forecast Inputs: Starting Solar Rate of $0.075/kWh with 2.5% Annual Escalator Estimated Average Annual Utility Power Inflation Rate of 4% Year Utility Bill Without Solar Energy Annual Solar kwhs PPA Rate Forecasted PPA Annual Bill Remaining Annual Utility Bill with Solar Total Annual PPA Bill + Utility Bill Annual Projected Savings 1 $1,031,903 4,837, $362,816 $667,706 $1,030,522 $1,381 2 $1,073,179 4,813, $370,027 $694,414 $1,064,442 $8,738 3 $1,116,106 4,789, $377,382 $722,191 $1,099,572 $16,534 4 $1,160,751 4,765, $384,882 $751,078 $1,135,961 $24,790 5 $1,207,181 4,741, $392,532 $781,122 $1,173,653 $33,527 6 $1,255,468 4,717, $400,333 $812,366 $1,212,700 $42,768 7 $1,305,686 4,694, $408,290 $844,861 $1,253,151 $52,536 8 $1,357,914 4,670, $416,405 $878,656 $1,295,060 $62,854 9 $1,412,231 4,647, $424,681 $913,802 $1,338,482 $73, $1,468,720 4,624, $433,121 $950,354 $1,383,475 $85, $1,527,469 4,601, $441,729 $988,368 $1,430,097 $97, $1,588,567 4,578, $450,509 $1,027,903 $1,478,412 $110, $1,652,110 4,555, $459,463 $1,069,019 $1,528,482 $123, $1,718,194 4,532, $468,595 $1,111,780 $1,580,374 $137, $1,786,922 4,509, $477,908 $1,156,251 $1,634,159 $152, $1,858,399 4,487, $487,406 $1,202,501 $1,689,907 $168, $1,932,735 4,464, $497,093 $1,250,601 $1,747,694 $185, $2,010,044 4,442, $506,973 $1,300,625 $1,807,598 $202, $2,090,446 4,420, $517,049 $1,352,650 $1,869,699 $220, $2,174,064 4,398, $527,326 $1,406,756 $1,934,081 $239,983 Total $30,728,089 92,290, $8,804,520 $19,883,002 $28,687,522 $2,040,567

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12 Solar Integration

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14 Project Benefits - Gilbert Gilbert did not have to pay for any of the project s capital costs (~ $10.4 million) Gilbert is not required to operate or maintain the solar system during the agreement term The System is off-setting 44% of the Neely Plant s power needs with clean renewable energy Gilbert s forecasted savings (~$2 million over 20 years) Water recharge operations and wildlife habitat not impacted Public/private partnership economic development Community marketability promotes sustainability Gilbert will be contributing to the betterment of the environment by off-setting an estimated 86 million pounds of carbon dioxide over the life of the system Fits Gilbert s Strategic Initiatives Clean, Safe, Vibrant

15 Featured in The Water Environment Federation s WE&T Magazine - April, 2012

16 QUESTIONS? Aerial Photos Courtesy of SPG Solar Presentation Templates by Mark Horn Gilbert, Arizona Wastewater Manager (480)