I saw this on the news last night, it looks like Fletcher, North Carolina is going to be home to the worlds largest solar heating and cooling system. A company called Vanir Solar Construction is building the system. They were previously known as Appalachian Solar Energy before being bought by the Vanir Solar Construction company. The second largest system is installed in the Olympic Village in Beijing China.
Appalachian Energy started out in 2003 and operates a small hydroelectric dam in Madison County which powers around 600 homes. As I understand this solar install will be in the Fletcher Business Park.