(1)    Construction. Unless otherwise specified in a construction permit, the authorization to construct, reconstruct, replace, or modify a stationary source is valid for 18 months from the date of issuance of the permit unless the permit is revoked or suspended. The department may extend the term of the authorization in the construction permit for the purposes of commencing or completing construction, reconstruction, replacement, or modification. Unless otherwise specified in a construction permit, the department may only extend the term of the authorization in the permit for up to 18 additional months beyond the original 18-month period. If construction, reconstruction, replacement, or modification is not completed within the term specified in the permit or any extension granted by the department, the applicant shall apply for a new construction permit. Notwithstanding the fact that authorization to construct, reconstruct, replace, or modify a source expires under this subsection, all conditions in a construction permit are permanent unless the conditions are revised through a revision of the construction permit or through the issuance of a new construction permit.

   (2)   Operation.

      (a)    The department shall specify the term of an operation permit in the operation permit. The term of an operation permit issued under s. 285.62 or renewed under sub. (3) may not exceed 5 years from the date of issuance or renewal.

      (b)    Notwithstanding par. (a), the department may not specify that coverage under a registration permit under s. 285.60 (2g) or coverage under a general permit under s. 285.60 (3) expires except as follows:

         1.    The department may specify an expiration date for coverage under a registration permit or for coverage under a general permit at the request of an owner or operator.

         2.    The department may specify a term of 5 years or longer for coverage under a registration permit or for coverage under a general permit if the department finds that expiring coverage would significantly improve the likelihood of continuing compliance with applicable requirements compared to coverage that does not expire.

         3.    The department may specify a term of 5 years or less for coverage under a registration permit or for coverage under a general permit if required by the federal clean air act.

      (c)    Notwithstanding par. (a), the department may specify a term of longer than 5 years for an operation permit or specify that an operation permit does not expire if all of the following apply:

         1.    The operation permit is for a stationary source for which an operation permit is required under s. 285.60 but not under the federal clean air act.

         2.    The operation permit is not a registration permit or a general permit.

   (3)   Renewal.

      (a)    A permittee shall apply for renewal of an operation permit at least 6 months before the operation permit expires. The permittee shall include any new or revised information needed to process the application for renewal.

      (b)    The department shall follow the procedures in s. 285.62 in renewing an operation permit for a new source, a modified source or an existing source.

      (c)    The department may renew an operation permit if the criteria in ss. 285.63 and 285.64 are met. Notwithstanding s. 285.64 (1) (a), the department may deny an application for renewal of an operation permit for a stationary source if the stationary source is in violation of its current operation permit.