(c) The nondiscriminatory open access transmission tariff must, as approved by the commission,

1. (1) pool backbone transmission system costs and allocate those costs through certificated load-serving entities on a coincident peak or load ratio share basis, or a combination of both; and

2. (2) account for

   1. (A) required backbone transmission system ancillary services;
   2. (B) backbone transmission system congestion;
   3. (C) disruptions to the backbone transmission system that result in the isolation of one geographical area of the backbone transmission system from another for more than 24 hours; and
   4. (D) costs to own and operate the backbone transmission system, as established by the commission or by contract, including transmission costs associated with the Bradley Lake hydroelectric project.