AZ HB2389

Allows utilities to replace an existing power plant or construct a new plant immediately adjacent to an existing plant without obtaining a new certificate of environmental compatibility, subject to specified conditions.

Requires utilities to provide 30 days' written notice to the Arizona Corporation Commission and hold at least one public comment session in the county where the existing plant is located before proceeding with the replacement or adjacent construction.

Limits the exemption to sites where plants previously received environmental compatibility certificates or were in use before August 13, 1971.

Requires that the combined nameplate rating of all plants on and adjacent to the site after construction must equal or exceed the aggregate rating of existing plants before construction.

Maintains existing exemptions allowing utilities to replace conductors, wires, or transmission line structures without new certificates if the original line was previously certified or authorized before August 13, 1971.