Longhorn Solar Offers Christmas Special for CPS Energy Customers With 1,000 Sq. Ft. or Larger Rooftops That Want to Generate $42,000 Worth of Free Solar Electricity Over the Next 25 Years SAN ANTONIO, TX--(Marketwire - Dec 5, 2011) - Many CPS Energy customers think that installing solar power is too expensive, but Longhorn Solar (http://www.longhornsolar.com) can show CPS Energy...