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The electric meter has been installed now and reads 00000. It also has a yellow "approved" sticker on the meter, with the date of inspection 6-1-2017. The stalls aren't numbered yet (1A, 1B, 2A, etc), but it looks like this site is getting close to opening.
According to my mom, who spoke to a worker installing sod at the site this afternoon, the superchargers are operational! The worker mention someone successfully charged their tesla at one of the stalls within the last hour.
Hy-Vee manager said this morning, on the phone, he knew nothing about the schedule for being operational. Electric meter reading other than 00000 should be a clue. I sure hope they are operating today!