# Air Plan Approval; Alabama: PSD Replacement Units
> **Rule** · Final rule. · Published 2019-07-03 · Effective 2019-08-02 · 84 FR 31741
## Document
- **Document number:** 2019-14142
- **Category:** air-emissions
- **Federal Register citation:** 84 FR 31741
- **CFR reference:** 40 CFR 52
- **Publication date:** 2019-07-03
- **Effective date:** 2019-08-02
- **State:** AL
- **EPA docket:** EPA-R04-OAR-2017-0371
## Abstract

The Environmental Protection Agency (EPA) is finalizing approval of revisions to the Alabama State Implementation Plan (SIP), submitted by the State of Alabama, through the Alabama Department of Environmental Management (ADEM), via two letters dated May 7, 2012, and August 27, 2018. The SIP revisions relate to the State's Prevention of Significant Deterioration (PSD) permitting regulations. In particular, the revisions add a definition of "replacement unit" and provide that a replacement unit is a type of existing emissions unit under the definition of "emissions unit." This action is being taken pursuant to the Clean Air Act (CAA or Act).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2019/07/03/2019-14142/air-plan-approval-alabama-psd-replacement-units)
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