Solar Farms, Access Tracks and EIA: “Private Road” Arguments Rejected; Judicial Review Confined to Pleaded, Process-Engaged Points

1. Introduction

Breen and Ors v An Coimisiun Pleanala and Anor (Approved) [2026] IEHC 338 is a High Court planning and environment judicial review in which local objectors (two individuals and a community CLG) sought to quash An Coimisiún Pleanála’s decision to grant permission for a large-scale solar PV development in Co. Tipperary. The developer, a renewable energy company, participated as notice party.

The challenge ultimately narrowed to two themes:

  • Domestic law: alleged invalidity of the planning application due to non-compliance with Articles 16–19 and 22–23 of the Planning and Development Regulations 2001.
  • EU law/EIA: an attempt to bring the solar project within Environmental Impact Assessment (“EIA”) requirements by characterising internal site access tracks as “private roads” exceeding the Schedule 5 Class 10(dd) threshold (and, relatedly, a request for a preliminary reference under Article 267 TFEU).

Humphreys J dismissed the proceedings, holding that the EIA “private road” theory was foreclosed by settled principles and by recent High Court authority, that the domestic-law complaints were inadequately pleaded and/or factually unfounded, and that (even if error had been shown) relief would have been refused in the court’s discretion.

2. Summary of the Judgment

  • Core Ground 1 (invalid application): rejected. The asserted breaches of the 2001 Regulations were inadequately particularised, often amounted to generic recitations of the regulations, and did not engage with the actual application documentation. Certain assertions (e.g., absence/unclear contours) were contradicted by the record.
  • EIA grounds (Core Grounds 4, 6, 7): rejected. EIA applies only to projects listed in the EIA Directive; solar farms are not listed, and internal access tracks for a solar farm cannot be used as a “side-wind” to convert the development into an EIA project by treating such tracks as “private roads” under Class 10(dd). The court followed and applied Cummins v An Coimisiún Pleanála [2025] IEHC 521 and Moss & Ors v An Coimisiún Pleanála (No.1) [2026] IEHC 62.
  • Preliminary reference: refused. No genuine interpretive doubt (acte clair/acte éclairé) arose, and the proposed reference did not “properly arise” on the facts and pleaded case.
  • Procedure/evidence: late “replying” affidavits were criticised as an impermissible attempt to introduce new matters after the event; in any case, legality must generally be assessed through the lens of the material before the decision-maker at the time.
  • Discretion: even counterfactually assuming error, the court would have refused certiorari as disproportionate and unsupported by any real-world prejudice, particularly given the clarity of the project description, extensive scrutiny, and the public interest in timely renewable energy delivery.
  • Order: proceedings dismissed, with a provisional “no order as to costs” subject to further written submissions.

3. Analysis

3.1 Precedents Cited

A. EIA applies only to listed projects; solar farms not listed

The judgment places decisive weight on the Supreme Court’s articulation that Directive 2011/92/EU does not apply to projects that are not listed, drawing particularly on Concerned Residents of Treascon and Clondoolusk v. An Bord Pleanála [2024] IESC 28. Humphreys J uses that authority to repel attempts to expand EIA’s scope by interpretive manoeuvre: if the directive’s Annexes do not include solar farms, EIA cannot be triggered by redefining ancillary features to “smuggle” the project into a listed class.

The court also cites the CJEU order in Salvatore Aiello and Others v Regione Lombardia and Others, C-156/07 for the proposition that the directive requires EIA only for projects listed in Annexes I and II (subject to the directive’s internal exceptions).

Earlier High Court support is referenced, including Kavanagh v. An Bord Pleanála [2020] IEHC 259.

B. Recent High Court authority rejecting the “access tracks as private roads” route

The applicants’ EU-law grounds were characterised as materially indistinguishable from arguments already rejected in:

  • Cummins v. An Coimisiún Pleanála [2025] IEHC 521 (internal tracks serving a solar farm not treated as “roads/private roads” for EIA purposes), and
  • Moss & Ors v. An Coimisiún Pleanála (No.1) [2026] IEHC 62 (similar “road” and notice/particulars points rejected; emphasis on workability).

On the reference issue, the court relied on Moss & Ors v An Coimisiún Pleanála (No.2) [2026] IEHC 175, which had already refused a CJEU reference on substantially the same “access track/road” contention.

C. Pleadings discipline in judicial review (especially EU-heavy planning claims)

The decision reiterates a stringent pleadings culture, grounded in Supreme Court authority including:

  • A.P. v. Director of Public Prosecutions [2011] IESC 2, Khashaba v. Medical Council [2016] IESC 10, Casey v. Minister for Housing, Planning and Local Government & Ors. [2021] IESC 42, and Concerned Residents of Treascon and Clondoolusk v. An Bord Pleanála & Ors. [2024] IESC 28 (applicants confined to pleadings);
  • Sweetman v. An Bord Pleanála (Sweetman XV) [2020] IEHC 39 (complex EU/transposition-type arguments require particular clarity);
  • Hellfire Massy Residents Association v. An Bord Pleanála [2022] IESC 38 and Babington v. Minister for Justice Equality and Law Reform & Ors. [2012] IESC 65 (scattergun pleadings rejected).

These authorities are applied concretely: generic quotations of regulatory language, unanchored to precise alleged defects in identified plans, were treated as incapable of sustaining certiorari.

D. Judicial review lens: legality, not merits; record-based assessment

The judgment leans on well-established review principles (including Meadows v. Minister for Justice, Equality and Law Reform [2010] IESC 3 and Amariei v. Chief Appeals Officer [2026] IESC 22) to frame the case as an attempt to re-run planning merits. It further emphasises that, save for defined exceptions, the legality of the decision is assessed through the material before the decision-maker at the time, drawing on lines of authority exemplified by I.S.O.F. v. Minister for Justice, Equality and Law Reform [2010] IEHC 457.

E. Discretion and proportionality even where error is shown

The court places its discretion analysis within the Supreme Court’s modern approach that certiorari is not automatic even where a “jurisdictional” flaw is alleged. Authorities cited include G. v. DPP [1994] 1 I.R. 374, Ballyboden Tidy Towns Group v. An Bord Pleanála [2024] IESC 4, and Protect East Meath v. Meath County Council [2026] IESC 12. The judgment also references the “unworkable interpretation” canon (e.g. Waltham Abbey/Pembroke Road Association v. An Bord Pleanála [2022] IESC 30, Heather Hill Management Company CLG v. An Bord Pleanála [2022] IESC 43).

F. CJEU references: “properly arises” + acte clair/éclairé

The refusal of a reference is supported by:

  • Consorzio Italian Management and Catania Multiservizi SpA v Rete Ferroviaria Italiana SpA, C-561/19 (acte clair/acte éclairé limits the obligation to refer), and
  • Eco Advocacy v. An Bord Pleanála [2025] IESCDET 74 (no reference if the point does not properly arise; also reflecting Jeroen van Schijndel and Johannes Nicolaas Cornelis van Veen v Stichting Pensioenfonds voor Fysiotherapeuten, C‑430/93 and C‑431/93 and Lucio Cesare Aquino v Belgische Staat, C‑3/16).

3.2 Legal Reasoning

A. The “private road” EIA theory fails at the level of EU-law structure

The court’s core reasoning is structural: the EIA Directive is not a general “significant effects” instrument for all projects; it is a listed-project regime. Attempts to treat internal, permeable, non-hardcapped access tracks as “private roads” under domestic EIA implementing thresholds were characterised as an unprincipled expansion that would undermine the directive’s categorisation choices and would create an “unworkable” spillover into many non-listed project types.

In applying Cummins and Moss (No.1), the court treated the tracks as functionally typical ancillary site infrastructure (including where constructed to a specified formation with hardcore/stone layers and geotextile), and not as the kind of “road” project that would independently trigger EIA under Class 10(dd).

B. Record-based review and the attempted late reshaping of the case

A significant procedural theme is that the applicants sought to develop the “roads” argument through late affidavits and through post hoc elaboration. Humphreys J emphasised that the court’s analysis is ordinarily limited to the record before the Commission, and that judicial review is not a second-stage factual and technical debate where arguments and evidence can be rebuilt after an adverse administrative outcome.

C. Domestic-law “invalid application” claims: pleading and proof deficits

For Core Ground 1, the judgment demonstrates how regulatory compliance challenges must be pleaded and evidenced:

  • Article 16: fell away because it presupposed an EIAR obligation that the court held did not arise.
  • Articles 17–19 (public notices): the demand for granular quantification (e.g., the number of panels) was rejected as exceeding what the Regulations require and as drifting into unworkability; additionally, the point had not been raised during the process.
  • Articles 22–23 (plans and particulars): complaints were either unparticularised or contradicted by the file (e.g., contours existed; distances to boundaries were shown in a workable manner). The court rejected an approach that would require exhaustive, point-to-boundary measurements for dense arrays of repetitive structures.

D. Discretion: technicality, absence of prejudice, and renewable-energy urgency

Humphreys J concluded that even if an error had been established, certiorari would have been refused as disproportionate. The factors listed included:

  • no realistic doubt about what the project entailed and extensive information before the Commission,
  • no pleaded or proven prejudice/misleading of participants,
  • the technical and non-substantive character of the alleged defects,
  • significant prior scrutiny,
  • non-compensatable financial prejudice and delay implications (including RES tender timing), and
  • the public interest and legal-policy context supporting accelerated renewable infrastructure delivery (also discussed in the judgment’s climate-law overview with reference to Coolglass Wind Farm Ltd v. An Coimisiún Pleanála [2026] IESC 5).

3.3 Impact

  • Planning/EIA litigation strategy: the decision strengthens the message from Cummins and Moss that solar farm objectors cannot manufacture EIA triggers by re-labelling internal site tracks as “roads/private roads.”
  • Pleadings and process engagement: it reinforces that EU-law arguments in planning JR must be pleaded with precision and should be meaningfully engaged during the administrative process; otherwise they face dismissal (including via discretion), even where the legal norm invoked is EU-derived.
  • Discretion as a real filter: the judgment illustrates a willingness to refuse certiorari for technical defects lacking demonstrated prejudice, especially where quashing would have major third-party and public-interest consequences.
  • References to the CJEU: it continues a trend (also seen in Moss (No.2)) of insisting that Article 267 references are not available as a tactical “escape hatch” where domestic and EU law are treated by the court as clear and settled on the pleaded facts.

4. Complex Concepts Simplified

EIA (Environmental Impact Assessment)
A structured assessment required by EU law for certain categories of projects listed in the EIA Directive. The court emphasised that EIA is not required for every project with environmental effects—only those of listed types (subject to the directive’s own mechanisms).
“Class 10(dd)” and “private road” threshold
A domestic implementing category in Schedule 5 of the 2001 Regulations: if a development is truly a “private road” above a stated length, EIA may be mandatory. The court held that internal access tracks within a solar farm did not meet that concept in the relevant EU-law context.
Acte clair / acte éclairé
EU law concepts limiting the duty to make a preliminary reference: if the answer is obvious (acte clair) or already settled (acte éclairé), a reference is unnecessary.
“Lens” of the material before the decision-maker
Judicial review generally tests legality based on what the public authority had before it when deciding, not on evidence or technical analysis produced later for litigation—subject to narrow exceptions.
Judicial review discretion
Even where an error is shown, the court may refuse certiorari where established legal values justify doing so (e.g., lack of prejudice, disproportionality, effect on third parties, or futility).

5. Conclusion

[2026] IEHC 338 consolidates a clear line: solar farms do not become EIA projects through ancillary internal access tracks described as “private roads,” and courts will resist unworkable interpretive expansions that would circumvent the EIA Directive’s listed-project architecture. The judgment also exemplifies the High Court’s insistence on (i) disciplined pleadings in EU-heavy planning judicial review, (ii) record-based legality review rather than post hoc reconstruction, and (iii) the practical operation of discretion to refuse certiorari where alleged defects are technical, non-prejudicial, and disproportionate to quash in the context of urgent renewable-energy delivery.