On Sun, 29 Jan 2017 17:52:20 -0500, wrote:

He won't get a second meter but they could set a gutter on the load
side of the meter, tap off another 100a and rock on.
Then the PoCo would have to come up with a 320a meter and heavy up the
service cables and heavy up the transformer if necessary. The owner
puts in the SE cable from the service point to the gutter.
That will also trigger another ground electrode conductor from the new
panel.

I know a lot about electrical, but you lost me on the "gutter" thing.
Can you either explain or provide a URL to some photos.