(a) The commission may consolidate into a single permit any permits, special permits, standard permits, permits by rule, or exemptions for a facility or federal source.
(b) Consistent with the rules adopted under Subsection (d) and the limitations of this chapter, including limitations that apply to the modification of an existing facility, the commission may amend, revise, or modify a permit.

(c) The commission may authorize changes in a federal source to proceed before the owner or operator obtains a federal operating permit or revisions to a federal operating permit if:
(1) the changes are de minimis under § 382.05101; or
(2) the owner or operator:
(A) has obtained a preconstruction permit or permit amendment required by § 382.0518; or
(B) is operating under:
(i) a standard permit under § 382.05195, 382.05198, or 382.051985;
(ii) a permit by rule under § 382.05196; or
(iii) an exemption allowed under § 382.057.
(d) The commission by rule shall develop criteria and administrative procedures to implement Subsections (b) and (c).
(e) When multiple facilities have been consolidated into a single permit under this section and the consolidated permit is reopened for consideration of an amendment relating to one or more facilities authorized by that permit, the permit is not considered reopened with respect to facilities for which an amendment, revision, or modification is not sought unless this chapter specifically authorizes or requires that additional reopening in order to protect the public’s health and physical property.