I installed 2 60 amp 3 phase receptacles in my warehouse in CA on a Friday a few months back. On the following Monday morning I had 3 trucks from the city and utility department taking pictures and documenting everything. They threatened to shut down power but I have a monitored fuel tank in the back so the state law prevented that from happening. My power usage went from 4 kW to 44 kW and I do have a smart meter at the building, so that's what triggered it. I have attempted to get a permit after the fact but ran into issues with that so they will probably come by one day to disconnect everything. I just applied for 1 MW of power at a building in WA so I hope that goes smoothly, currently running 40 kW there without incident.
So that might explain a bit, I'm in CA too and also have a "smart meter". What was their reasoning to threaten to shut it down? Was all your work up to code?
What I find funny about all of this is that I know there are idiots out there risking their freedom by jumping the meter to get free electricity. Here I am doing nothing wrong (yet paying an arm and leg for electricity) and I'm probably on some list, while some scumbags who are literally stealing don't get bothered.