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I decided to contact EIA, and found out that form EIA-861 is filled out annually by each Utility. Note the last question under Photovoltaic. "If Available, Enter the Electric Energy Sold Back to the Utility". "If Available" - my point is that this is seldom, if ever, available. There is one meter, and it measures total electric usage minus renewable generation. It doesn't measure the exact contribution of the PV system.
View attachment 67259053
Because of the "If Available" clause, Utilities have the option to leave this blank, and that's probably what most do... In other words - the philosophy that "no information is better than wrong information"...
More likely they create an algorithm to estimate.