FOIA Exemption 4 Limits and FOIA Fee Eligibility When an Agency Releases Records After a Third Party Relents

I. Introduction

In Energy & Policy Inst. v. Tenn. Valley Auth. (6th Cir. May 8, 2026), the Energy and Policy Institute (“EPI”), a watchdog organization, sought records from the Tennessee Valley Authority (“TVA”) under the Freedom of Information Act (“FOIA”) concerning (1) TVA’s communications with industry groups—the Climate Legal Group (“CLG”) and the Power Generation Air Coalition (“PGen”), coordinated by McGuireWoods—and (2) an insurance policy between TVA and AEGIS.

TVA produced some records, redacted others, and withheld additional documents, invoking FOIA Exemptions 4, 5, and 6. During litigation, TVA released more documents after McGuireWoods indicated it no longer objected to disclosure of certain materials. The district court granted summary judgment to TVA on the remaining withholdings and denied EPI’s request for attorneys’ fees.

The Sixth Circuit affirmed in part, reversed in part, and remanded, addressing two core issues: (1) the proper application of Exemptions 4 and 6 (including segregability and confidentiality limits), and (2) FOIA fee eligibility when an agency releases records mid-litigation after a third-party submitter changes its position.

II. Summary of the Opinion

  • Exemption 4 (commercial information): The court largely upheld withholding of CLG “Updates,” member/client lists, and insurance policy terms as commercial information, but held that certain “logistical/administrative” communications (e.g., meeting scheduling, naming discussions, use of “eRoom notifications”) were inadequately justified because TVA failed to explain foreseeable commercial harm.
  • Exemption 4 (confidentiality and public disclosure): The court ordered clarification and possible disclosure of current PGen member names because PGen’s current members appear publicly listed; only potential members who did not join could remain confidential.
  • AEGIS negotiator’s name: TVA’s Exemption 4 redaction of the name of the AEGIS representative who negotiated the policy lacked legal support.
  • Exemption 6 (personal privacy): Individual names and email addresses are generally protected, but the court emphasized Exemption 6 does not apply to company names, and directed consideration of segregating and releasing email domain names (e.g., “█████@mcguirewoods.com”).
  • Exemption 5: The district court mistakenly believed Exemption 5 was always coextensive with other exemptions, but the Sixth Circuit found no live dispute requiring reversal on the specific Exemption 5 redactions EPI targeted.
  • Attorneys’ fees eligibility: The court reversed the district court’s ineligibility ruling, holding that TVA’s mid-litigation release can qualify as a “voluntary” change in position even if prompted by McGuireWoods. The case was remanded to decide causation (“catalyst”), “not insubstantial” claim, and entitlement.

III. Analysis

A. Precedents Cited (and How They Shaped the Decision)

1. FOIA summary judgment, evidentiary showings, and Vaughn practice

  • Cincinnati Enquirer v. Dep't of Just. and Rimmer v. Holder: The court reaffirmed de novo merits review and the standard practice that agencies may carry their burden using a Vaughn index and affidavits, which receive a presumption of good faith absent contrary evidence.
  • ACLU v. Dep't of Just.: Cited for the foundational point that the agency bears the burden of justifying exemptions.
  • S. Appalachian Biodiversity Project v. U.S. Forest Serv. and Jones v. FBI: Used to situate the Vaughn-index mechanism and the discretionary nature of in camera review where the index provides adequate detail.
  • Vaughn v. United States and Rugiero v. Dep't of Just.: Grounded the “sparingly” approach to in camera review and the abuse-of-discretion standard.

2. Exemption 4: “commercial,” “obtained from a person,” and “confidential”

  • Pub. Citizen Health Rsch. Grp. v. FDA: Supplied the three-part Exemption 4 framing and the “income-producing aspects of a business” lens. The Sixth Circuit used this framework to categorize McGuireWoods’ products (legal updates, client/member lists) as “commercial.”
  • Food Mktg. Inst. v. Argus Leader Media: Provided the modern meaning of “confidential”—information “customarily and actually treated as private” and (jointly sufficient with) assurance of privacy. The court leaned on confidentiality agreements/bylaws to uphold most Exemption 4 withholdings, while reserving unresolved questions left open by Argus Leader.
  • Citizens for Resp. & Ethics in Wash. v. Dep't of Just., Bloomberg L.P. v. U.S. Postal Serv., and Nat'l Ass'n of Home Builders v. Norton: Supported a functional understanding of “commercial”—information that “serves a commercial function.” This framing allowed the court to treat legal-advice “Updates” as commercial products.
  • Ctr. for Inquiry, Inc. v. Dep't of Health & Hum. Servs.: Reinforced that the very “product” a business sells can be commercial information under Exemption 4—analogized to McGuireWoods’ legal updates.
  • Greenberg v. FDA: Supported treating client/customer lists as “commercial.”
  • Bd. of Trade of City of Chi. v. Commodity Futures Trading Comm'n, OSHA Data/C.I.H., Inc. v. Dep't of Lab., and Gulf & W. Indus., Inc. v. United States: Informed the “obtained from a person” discussion, particularly when agencies repackage private information.
  • S. All. for Clean Energy v. Dep't of Energy: Provided the “substantially reformulated by the agency” concept; the Sixth Circuit used it to reject EPI’s attempt to recharacterize mixed collaborative drafts as agency-generated.
  • Farmworker Justice v. Department of Agriculture: Distinguished to reject EPI’s argument that broader sharing among members defeats confidentiality; mass distribution (265,000 families) is unlike limited industry-group membership.

3. Exemption 6 privacy balancing

  • Dep't of State v. Wash. Post Co.: Established the breadth of “similar files,” but also the limiting principle that Exemption 6 is about information “applying to a particular individual.” The Sixth Circuit used this to differentiate individual identifiers from company names and to support domain-name segregation.
  • Rugiero v. Dep't of Just.: Anchored the two-prong Exemption 6 test and the point that identifying information may be protected even if publicly available.
  • Dep't of Def. v. FLRA: Supplied the rule that the only relevant “public interest” is shedding light on what the government is doing.
  • Heights Cmty. Cong. v. Veterans Admin.: Used to discount generalized “monitoring” interests absent a concrete showing of how disclosure illuminates agency performance.

4. Mootness doctrines and FOIA practices

  • Spencer v. Kemna, Lewis v. Cont'l Bank Corp., and Los Angeles v. Lyons: Used to reject “capable of repetition, yet evading review” arguments regarding withdrawn privilege theories.
  • Payne Enters., Inc. v. United States and Perry v. Block: Framed the rule that once records are surrendered, courts generally have no further statutory function, absent a broader “policy or practice” claim.

5. Attorneys’ fees and the OPEN Government Act

  • Sigmon Fuel Co. v. Tenn. Valley Auth.: Provided the fee-award standard of review and the decomposition of legal vs. factual vs. discretionary components.
  • GMRI, Inc. v. EEOC: Provided Sixth Circuit framing of eligibility (“substantially prevailed”) and entitlement (equitable discretion), and summarized the pre-Buckhannon catalyst approach.
  • Church of Scientology of Cal. v. Harris and Miller v. Dep't of State: Examples of pre-OGA catalyst theory in sister circuits.
  • Buckhannon Bd. & Care Home, Inc. v. W.V. Dep't of Health & Hum. Res.: The conceptual backdrop for the OGA amendment; crucially, the Sixth Circuit used Buckhannon to suggest an alternative, textually grounded reading of “voluntary or unilateral” that contrasts non-judicial changes with judicially sanctioned relief.
  • First Amend. Coal. v. Dep't of Just. and Brayton v. Off. of the U.S. Trade Rep.: Cited for how other circuits have treated OGA as reinstating catalyst theory and for interpretive context.
  • Batton v. Internal Revenue Serv.: Quoted for a catalyst-related articulation focusing on whether litigation caused “the delivery of the information.”
  • Pomares v. Dep't of Veteran Affs., Chrysler Corp. v. Brown, and Jurewicz v. Dep't of Agric.: Used to explain the Exemption 4 submitter-notice ecosystem, agency reliance on submitters, and the availability of “reverse-FOIA” suits.

B. Legal Reasoning

1. Exemption 4: “Commercial” must connect to foreseeable harm, not mere business context

The court treated McGuireWoods’ CLG Updates as the “commercial product” sold to members, making them quintessentially commercial information. Likewise, member/client lists and recruitment discussions were treated as commercial because they closely resemble “inventories” or “sales statistics” in their relationship to revenue generation.

But the court drew a limiting line: for certain logistical/operational messages (meeting scheduling, communication mechanics, name-selection discussions), TVA failed to explain how disclosure would harm an interest protected by Exemption 4, as required by FOIA’s “foreseeable harm” requirement (5 U.S.C. § 552(a)(8)(A)(i)). In effect, the Sixth Circuit required a concrete harm narrative, not an assertion that “law firms do this for money.”

2. Exemption 4: “Obtained from a person” survives collaborative iterations where segregation is impractical

EPI attempted to defeat Exemption 4 by hypothesizing TVA participation in drafting and email threads, arguing the records were partly agency-generated. The court rejected that approach largely on segregability grounds: even if TVA contributed, the protected material (counsel’s drafts, advice, and the surrounding private-party context) was not “reasonably segregable” from any agency-originated snippets. The court also found no basis to infer TVA had “substantially reformulated” the underlying private information.

3. Exemption 4 confidentiality can be lost through public disclosure—especially for current membership

Applying Argus Leader, the court found confidentiality supported by sworn declarations and contractual/bylaw confidentiality structures. However, the court held that confidentiality fails where the information is publicly disclosed. Because PGen’s website appeared to display current member companies publicly, the court required TVA to distinguish between:

  • Potential members who never joined (names may remain confidential), and
  • Current members whose names are public (names cannot be withheld as “confidential” under Exemption 4).

4. The AEGIS negotiator’s name is not “commercial” under Exemption 4

TVA redacted the negotiator’s name under Exemption 4 and refused to rely on Exemption 6. The Sixth Circuit found no legal or evidentiary basis establishing the name as commercial information and reversed that redaction. The court’s move underscores that Exemption 4 is about protected commercial/financial information—not a generic confidentiality label supplied by the submitter.

5. Exemption 6: Individual identifiers protected; company identifiers and domain names treated differently

The court agreed that individual names and business email addresses implicate significant privacy interests under Rugiero and Wash. Post, and that EPI’s asserted interest (“who is influencing TVA”) was too undeveloped—especially given EPI’s concession that company names would satisfy its purpose.

But the court provided two important correctives:

  • Company names are not protected by Exemption 6 because the exemption protects “individual[s],” not entities.
  • Email domain names may be segregable and non-identifying; the court suggested releasing “█████@company.com” formats because the domain alone does not identify a particular individual.

6. Attorneys’ fees: “Voluntary” agency change can exist even when the submitter relents

The district court denied fees because TVA’s mid-litigation release occurred after McGuireWoods withdrew objections, so it viewed TVA’s change as not “voluntary or unilateral.” The Sixth Circuit reversed, reasoning:

  • Even in Exemption 4 contexts where agencies consult submitters (and submitters can sue in reverse-FOIA), TVA retains legal authority and responsibility to decide and comply with FOIA (including under 18 C.F.R. § 1301.8(f) and 5 U.S.C. § 552(a)(3)(A)).
  • Therefore, the decision to release is still TVA’s choice and can be “voluntary.”

The court then flagged, but did not decide, a broader statutory-interpretation question raised by amicus: whether the OGA necessarily codifies the full pre-Buckhannon catalyst causation requirement, or whether “not insubstantial” does different work. The panel assumed (for this case) that causation is required, and remanded for the district court to decide causation, “not insubstantial,” and entitlement.

C. Impact

  • Sharper Exemption 4 boundary in the Sixth Circuit: Agencies must connect the “commercial” label to a plausible, articulated competitive or market harm narrative (consistent with the statutory “foreseeable harm” requirement), particularly for administrative/logistical records.
  • Public disclosure defeats confidentiality for membership identities: If an industry group publicizes current membership, agencies cannot continue to treat those company names as “confidential” under Exemption 4. Expect more litigation over how broadly “public” dissemination must be and how precisely agencies must verify current vs. prospective status.
  • Entity vs. individual distinction under Exemption 6: The decision reinforces that Exemption 6 is not a corporate shield. It also invites FOIA litigants to press for domain-name segregation as a middle-ground disclosure.
  • Fee eligibility expanded where releases follow submitter reversals: Requesters may be eligible for fees even if a third-party submitter precipitates disclosure, because the agency’s change can still be “voluntary.” On remand, however, plaintiffs still face the causation question (would disclosure have happened anyway?).
  • Practical pressure on submitter-notice regimes: Agencies may face increased incentives to scrutinize submitter confidentiality assertions early—especially when withheld material is arguably mundane—because mid-litigation releases can trigger fee exposure.

IV. Complex Concepts Simplified

  • Vaughn index: A structured list (often with descriptions and exemption rationales) that allows a court to evaluate withholdings without reviewing every document in camera.
  • Segregability: FOIA requires agencies to release any non-exempt portion of a record that can reasonably be separated from exempt parts.
  • Exemption 4: Protects certain private-party commercial/financial information held by the government—especially where disclosure could harm competitive interests or undermine cooperation with government programs.
  • “Confidential” after Argus Leader: At minimum, the owner must actually treat the information as private and customarily keep it private; providing it to the government under assurances of privacy is jointly sufficient.
  • Exemption 6 balancing: Courts weigh an individual’s privacy interest against FOIA’s core public interest—learning what the government is doing— not curiosity about private individuals.
  • “Reverse-FOIA”: A lawsuit by the submitter of information to prevent the government from disclosing it (typically under the APA), referenced here via Chrysler Corp. v. Brown.
  • FOIA fee “catalyst” theory: A plaintiff may recover fees when its lawsuit caused the agency to release records without a court order, depending on the interpretation of the OPEN Government Act’s amendments.

V. Conclusion

Energy & Policy Inst. v. Tenn. Valley Auth. refines FOIA practice in three notable ways. First, it confirms that sophisticated legal and client-relation materials can qualify as Exemption 4 “commercial” information, but it also demands a real showing of foreseeable harm—especially for administrative logistics. Second, it emphasizes that Exemption 4 confidentiality can evaporate when the supposedly confidential fact (like current membership) is public. Third, it clarifies Exemption 6’s focus on individuals (not companies) and highlights domain-name segregation as a viable disclosure compromise.

On attorneys’ fees, the decision’s most consequential move is its eligibility holding: an agency’s mid-litigation release can be “voluntary” even when prompted by a third-party submitter’s change of heart. The remand leaves open the key fee question—causation—but the Sixth Circuit has made clear that agencies cannot avoid fee eligibility simply by pointing to the submitter’s role where the agency ultimately chose to release the records.