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HB 5557

Environmental protection: air pollution; calculation of emission profile data; modify. Amends sec. 5503 of 1994 PA 451 (MCL 324.5503).

2025-2026 Regular Session Introduced by Karl Bohnak and 6 co-sponsors

Michigan would require calculating emission rates for inventories using the longest time period allowed under the Clean Air Act.

REFERRED TO COMMITTEE ON NATURAL RESOURCES AND AGRICULTURE
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Bill Summary · HB 5557

Summary of Michigan House Bill 5557 (2025-2026)

Title

Environmental protection: air pollution; calculation of emission profile data; modify. Amends sec. 5503 of 1994 PA 451 (MCL 324.5503).

Purpose and Intent

  • To require the Michigan Department of Environment, Great Lakes, and Energy (EGLE) to calculate emission rates for a permit holder’s emissions inventory using the longest time period allowed under the federal Clean Air Act.
  • The bill aims to standardize and potentially extend the time horizon used for calculating emission rates included in emission inventories, aligning Michigan’s practice with the maximum allowable period under federal law.

Key Provisions and Changes (as introduced)

  • Amends section 5503 of the Natural Resources and Environmental Protection Act (NREPA), MCL 324.5503.
  • The provision related to the department’s authority (EGLE) to regulate air quality includes:
    • The department’s authority to promulgate standards for ambient air quality and emissions.
    • The authority to issue, deny, modify, revoke, or reissue permits for construction and operation of sources, subject to enforceable emission limitations and other conditions.
    • Broad enforcement and oversight powers (inspections, complaints handling, court actions, reporting requirements, etc.).
    • Specifically, the change centers on how emission rates for the emissions inventory are calculated: the department must use the longest time period allowed under the Clean Air Act when calculating emission rates for an emissions inventory.
  • Other, ongoing authorities and responsibilities of the department under sec. 5503 remain intact (permits, enforcement, data collection, cooperation, studies, etc.).

Who/What is Affected

  • Affected Entity: Permit holders and sources of air pollution in Michigan, as well as EGLE (the department) responsible for administering air quality programs.
  • Emissions Inventory Data: The methodology used to calculate emission rates for inventories submitted to EGLE, which affects permit applications, compliance demonstrations, and potential regulatory requirements.
  • Stakeholders benefiting or needing to adapt include industry permit applicants/owners, environmental compliance staff, and communities relying on ambient air quality protections.

Procedural and Timeline Aspects

  • Status: Introduced February 24, 2026; referred to the Committee on Natural Resources and Tourism.
  • Immediate effect upon enactment: Assuming passage, the department would be required to implement the use of the longest permissible time frame under the Clean Air Act for emission-rate calculations in emission inventories.
  • Fiscal impact: A fiscal analysis is in progress (as of the bill’s analysis note). No specific dollar amounts are provided in the bill text or summary.
  • The bill follows standard legislative process: introduction, committee referral, potential hearings, amendments, and floor votes before moving to the other chamber.

Additional Context

  • Sponsors include Rep. Dave Prestin and several co-sponsors.
  • The accompanying Legislative Analysis notes the core change as: “use the longest time frame allowed under the federal Clean Air Act when calculating emission rates for a permit holder's emission inventory,” which could affect permit calculations, compliance timelines, and emissions inventories submitted to the state.

If you’d like, I can compare this bill to Michigan’s current practice or provide a brief examples-based illustration of how using the longest Clean Air Act time frame might affect emission-rate calculations for a hypothetical facility.

Compiled from official sources — confirm details with the bill’s official record.

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