; (B) a Regional Transmission Organization; or (C) an Independent System Operator. (18) State regulatory authority The term State regulatory authority has the meaning given the term in section 3 of the Federal Power Act ( 16 U.S.C. 796 ). 3. Probabilistic modeling for bulk-power system resource adequacy modeling and integrated resource planning (a) In general The Commission, pursuant to section 215(d) of the Federal Power Act ( 16 U.S.C. 824o(d) ), shall— (1) as soon as practicable after the date of enactment of this Act, order the Electric Reliability Organization to submit to the Commission, not later than 18 months after the date of that order, or as soon as practicable thereafter, 1 or more proposed reliability standards or modifications to reliability standards to require, and ensure consistent methods (based on best-practices) for, the use of probabilistic modeling that includes consideration of key uncertainties in generation, transmission, energy storage systems, and loads for resource adequacy modeling and integrated resource planning relating to the bulk-power system, reflecting the specific needs, resources, and attributes of a given power grid region or service area; and (2) as soon as practicable after the submission of a proposed reliability standard or modification of a reliability standard under paragraph (1), approve the proposed reliability standard or modification in accordance with that section, if appropriate. (b) Requirements (1) Generation With respect to generation, the reliability standards approved under subsection (a) shall require that probabilistic modeling for resource adequacy modeling and integrated resource planning shall include, to the maximum extent practicable, consideration of uncertainties relating to, as applicable for a given power grid region or service area— (A) the impact of distributed generation resources; (B) degradation from aging (such as soiling and degradation of photovoltaic modules and batteries); (C) planned and unplanned outages