Completely agree with the above. The white cabinets are the supercharger inverter stacks, the grey cabinets are the power distribution centers, and on 9/6 the transformer pad was empty, lacking the green transformer which will look very much like the one in SapphireX's post. Unfortunately, waiting for days to weeks for the utility company transformer is a common occurrence. After the transformer is installed, watch for the telltale signs that the Tesla supercharger tech/bunny/fairy has visitied: numbered stickers on the base of each charging bollard and the red glow of their logos.
If you see a transformer like the one in jdo's post, I find the best thing to do is just wait for it to get bored and leave.