Unfortunately what Tesla doesn't tell you is that the electricity company has to approve the sale of energy storage products for their territory. In my case, I had placed my order for my Power back in 2016, and in early 2017 Tesla called me to tell me that they just received permission to sell the product in my area (PG&E is my provider), so it was only then that they could begin the onsite inspection.
It's possible that they aren't in your area because your power company doesn't yet permit energy storage solutions behind the meter...
Just a guess.