I hope this doesn't throw too much additional confusion into electricity:grid, 
but in many parts of the world (including where I am, California) a frequent 
method for connecting solar panels to both one's house / commercial building 
and the grid is to do what is known as "grid-tie," sometimes called "net 
metering."

Grid-tie means that during sunshine, the solar panels generate and "spin the 
electric meter backwards" (creating a credit to the customer with the electric 
company) and at night, when electricity use / loads create a debit (by drawing 
power directly from the grid / electric company), the meter "spins forward" as 
usual during power use.  Of course, the idea is that generation and load 
balance each other out during a billing cycle and this "net metering" nets out 
to about zero, so the customer has a near-zero bill.

That is prevalent enough in the world that if OSM is going to design a tag for 
electricity:grid, it really needs a syntactic accommodation for "grid_tie" or 
"net_metering" (which are essentially the same).  Especially as I'm not sure if 
this would go under electricity or electricity:source (which introduce at the 
same time), I haven't any specific suggestion on a key, tag or namespace, but I 
think it important to mention what I haven't seen in this discussion.

SteveA
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