This excerpt taken from the PCG 10-K filed Feb 18, 2005.
8.2. Protective Relay Systems.
Each Participating TO shall provide to the ISO protective relay system functional information necessary to perform system planning and operating analysis, and to operate transmission facilities on the ISO Controlled Grid in compliance with WSCC/NERC planning, reliability and protection policies and standards.
The requirements of this Section 8.2 shall apply only to the transmission facilities that are part of the ISO Controlled Grid.