Retailing in North America has come to be dominated by the chains with large stores. To improve there green credentials and their bottom line they are looking to the sky for power. Solar power is probably the next big thing in retailing and with good reason. These places are huge and they have the roof space for solar panels. Combine solar power with efficiency and conservation in the store and it would lead to a serious reduction in power consumption and GHG emissions.
Hopefully they are able to achieve the scale needed to make an impact. The rollouts are slow and they are probably having a tough time getting supplies as the solar market has been booming.