This excerpt taken from the PCG 10-K filed Feb 18, 2005.
2.1. Transmission Owners:
2.1.1 Initial Transmission Owners. The following entities are subscribing to this Agreement as of the date hereof for the purpose of applying to become Participating TOs in accordance with Section 2.2:
i. Pacific Gas and Electric Company;
ii. San Diego Gas & Electric Company; and
iii. Southern California Edison Company.
2.1.2 Right to Become a Party.
After this Agreement takes effect, any other owner of or holder of Entitlements to transmission lines and facilities connected to the ISO Controlled Grid may apply to the ISO under Section 2.2 to become a Participating TO and become a Party to this Agreement.