# Air Quality Implementation Plan Approval; Illinois; Illinois Power Holdings and AmerenEnergy Medina Valley Cogen Variance
> **Rule** · Final rule. · Published 2015-12-21 · Effective 2016-01-20 · 80 FR 79261
## Document
- **Document number:** 2015-31882
- **Category:** air-emissions
- **Federal Register citation:** 80 FR 79261
- **CFR reference:** 40 CFR 52
- **Publication date:** 2015-12-21
- **Effective date:** 2016-01-20
- **State:** IL
- **EPA docket:** EPA-R05-OAR-2014-0705
## Abstract

The Environmental Protection Agency (EPA) is approving into the Illinois Regional Haze State Implementation Plan (SIP) a variance for the electrical generating units (EGUs) included in the Ameren Multi-Pollutant Standard Group (Ameren MPS Group). The Ameren MPS Group consists of five facilities owned by Illinois Power Holdings, LLC (IPH) and two facilities owned by AmerenEnergy Medina Valley Cogen, LLC (Medina Valley). The Illinois Environmental Protection Agency (IEPA) submitted the variance to EPA for approval on September 3, 2014.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/12/21/2015-31882/air-quality-implementation-plan-approval-illinois-illinois-power-holdings-and-amerenenergy-medina)
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