Alamo Heights Independent School District
Scope of Work:
System Size: 630 kW DC
Panel Count: 2,469 Suniva 225W
and 1,404 Hanwha 290W
Inverters: SMA transformerless
30-Year Electric Bill Savings: $1.2 million
Project Commissioning: 2011 and 2013
Alamo Heights, Texas
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Alamo Heights ISD (AHISD) in San Antonio, TX issued two competitive RFPs in 2011 and 2013 to design and build a total of seven turnkey, grid-tied solar systems on various school facilities totaling 630kW-DC. These solar projects were for two school buildings; secondarily, another five projects included four schools and a plant services building. The projects save the district over $40,000 annually in electricity costs. A 20-year contract to provide electricity back into the grid also generates over $230,000 annually.
These complex projects required consideration of local utility CPS Energy’s interconnection requirements; installation of both roof and ground mount systems; and a tight construction schedule working around ongoing school and community activities with associated construction restrictions. The first two projects, 2,469 Suniva 255W monocrystalline solar modules and (30) high-efficiency SMA transformerless string inverters. secured a $0.27/kWh Feed-In Tariff from the CPS Solartricity Program. The next five projects, 1,404 Hanwha 290W polycrystalline solar modules and 22 high-efficiency SMA transformerless inverters utilized the CPS Net Metering program, allowing the schools to store excess energy as electricity credits towards their electrical costs.