Longhorn Solar Offers a $3,000 Solar Rebate to Dr. Pepper Snapple Plano Employees Who Sit Through a Free 10-Minute Rooftop Review at the April 17th Dr. Pepper's Earth Day Celebration DALLAS, TX--(Marketwire - Apr 17, 2012) - In order to celebrate Earth Day in Plano, Longhorn Solar (www.longhornsolar.com) will be offering a special solar rebate for all Dr. Pepper Snapple...