My aim is to map PV plant locations to their respective transmission zones. 

NREL has approximately 6,000 simulated PV plants over US. These data were used for transmission grid integration studies. In order to perform any simulation, these PV plants must be mapped to their respective transmission zones (as the first step). However, I am having trouble finding the corresponding shapefiles.

Does anyone know where can I get the transmission zone maps (in any computer readable format) for any iso, such as CAISO, NYISO, PJM, etc. 

Just some clarifications: I understand that transmission line details are highly sensitive (which I do not need), but the zone maps (geographical boundaries) can be found easily on the internet. It is strange that the shapefiles are, in fact, hard to find.

Dazhi

http://www.nrel.gov/electricity/transmission/solar_integration_methodology.html

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