I think you missed my point. Amazon needs to evaluate the customer service and project management abilities of SUNW and determine if it's scalable to residential. This is the first step. They wouldn't do that test on their customers initially. Cost per acquisition is an important component in residential solar.
FYI, apparently it's two installs of 1MW each, for a total of 2MW. From the PR: "the rooftop solar installations of 1 Megawatt mounted projects in both [locations]" It is not worded very clearly.