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HB 3673

CORPORATE EMISSIONS REPORTING

104th Regular Session Introduced by Kimberly Du Buclet

The bill requires large Illinois-registered companies to measure, publicly disclose, and have their GHG emissions (Scope 1–3) independently verified in a statewide public registry.

Rule 19(a) / Re-referred to Rules Committee
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Bill Summary · HB 3673

Summary — HB 3673 (Climate Corporate Accountability Act)

Status: Rule 19(a) / Re-referred to Rules Committee
Introduced: Feb 18, 2025 (Rep. Kimberly Du Buclet) — companion: SB 1080
Effective date: Immediately (per bill text)

Purpose

Establish a statewide program requiring large companies that do business in Illinois to measure, verify, and publicly disclose their greenhouse gas (GHG) emissions (Scope 1, Scope 2, and Scope 3). The bill seeks to increase corporate emissions transparency and create a public, searchable emissions registry.

Who is covered

  • “Reporting entities” are business entities (partnerships, corporations, LLCs, etc.) that do business in Illinois and have annual revenues in excess of $1,000,000,000. (Text in the bill is truncated in places; this revenue threshold is the identified coverage criterion.)

Key provisions

  • Rulemaking deadline: The Secretary of State must develop and adopt rules by July 1, 2026, to require annual disclosure and verification of Scope 1, Scope 2, and Scope 3 emissions.
  • Public disclosure schedule:
    • Beginning January 1, 2027, and annually thereafter reporting entities must publicly disclose to the emissions registry:
    • Scope 1 and Scope 2 emissions for the prior calendar year (by Jan 1 each year); and
    • Scope 3 emissions for that same calendar year no later than 180 days after that date (i.e., within ~6 months).
    • The Secretary of State must review and, if necessary, update disclosure deadlines by July 1, 2029 to better align timelines and stakeholder input.
  • Standards and verification:
    • Reporting must follow the GHG Protocol (Corporate Accounting and Reporting Standard and Corporate Value Chain/Scope 3 guidance).
    • Emissions inventories must be independently verified by an emissions registry or an approved third‑party auditor; the Secretary of State will set auditor qualifications and an approval process.
  • Emissions registry and public platform:
    • The Secretary of State shall contract with a nonprofit emissions registry organization (with U.S. voluntary registry experience) to build and operate a public reporting and registry program.
    • The registry must create a publicly accessible digital platform that houses all disclosures (deadline: on or before Jan 1, 2027).
  • Reporting analysis:
    • By Jan 1, 2027, the Secretary of State must contract with the University of Illinois, a national lab, or an equivalent academic institution to prepare a report on the public disclosures.
  • Rule development consultations: Secretary of State must consult the Attorney General, relevant government stakeholders, climate and carbon accounting experts, and consumer/environmental justice representatives.
  • Enforcement: The bill states it provides for enforcement, though the specific enforcement mechanisms are not detailed in the available excerpt.

Potential impacts

  • Transparency: Creates public, standardized disclosures of large companies’ full-scope (1–3) emissions.
  • Compliance costs: Companies meeting the $1B threshold may incur costs for emissions accounting, data collection (especially Scope 3), third‑party verification, and IT/reporting.
  • Supply chain focus: Requirement to report Scope 3 could push firms to engage suppliers and contractors on emissions data and reductions.
  • Public accountability: Data on a public platform may inform investors, regulators, consumers, and advocacy groups.

Notes and uncertainties

  • Some text in the bill draft is truncated/garbled; core coverage appears tied to a $1 billion revenue threshold.
  • Specific enforcement provisions and penalties are not present in the provided text excerpt.
  • Implementation depends on rulemaking by the Secretary of State and on contractor capacity for an emissions registry and qualified auditors.

Legislative actions to date include committee hearings and a committee substitute; the bill was placed on the General State Calendar (May 7, 2025) and is re-referred to the Rules Committee.

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

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