# Air Plan Approval; Alabama: PSD Replacement Units
> **Rule** · Direct final rule. · Published 2017-08-24 · Effective 2017-10-23 · 82 FR 40072
## Document
- **Document number:** 2017-17342
- **Category:** air-emissions
- **Federal Register citation:** 82 FR 40072
- **CFR reference:** 40 CFR 52
- **Publication date:** 2017-08-24
- **Effective date:** 2017-10-23
- **State:** AL
- **EPA docket:** EPA-R04-OAR-2017-0371
## Abstract

The Environmental Protection Agency (EPA) is approving a portion of Alabama's State Implementation Plan (SIP) revision submitted by the State of Alabama, through the Alabama Department of Environmental Management (ADEM), on May 7, 2012. The portion of the revision that EPA is approving relates to the State's Prevention of Significant Deterioration (PSD) permitting regulations. In particular, the revision adds a definition of "replacement unit" and provides 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/2017/08/24/2017-17342/air-plan-approval-alabama-psd-replacement-units)
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