TOD Variables for PPA Price

Good morning!
I'm working with the time dependent pricing for a molten salt tower plant.

My first question regards the PPA framework:
-are you aware of any documentation or source of info for me to better understand how it works?

I was then wondering if some specific documentation is available regarding the schedules provided in the "dispatch schedule library" ("thermal storage" page in SAM).
In particular from where these schedules derive, and if any "institutional" source is available which describes them.

For instance, looking at the schedule "PG&E 2009":
-for what does "PG&E" stands for?
-from where it is taken?
-is there any US state where it is actually adopted?


thanks a lot

Emiliano Casati