Summary of Judgment by Judge Humphreys

Factual and Procedural Background

This judgment concerns a statutory planning judicial review challenge to a decision dated 25 February 2025 by a national planning body ("Company B") granting planning permission for a strategic infrastructure development consisting principally of a wind farm of thirteen turbines, a 110 kV substation and associated works located across townlands in The County. The planning application had been made directly to Company B by the developer ("Company F") following pre‑application consultations under the Planning and Development Act. The application was supported by an Environmental Impact Assessment Report (EIAR), a Natura Impact Statement (NIS) and related documentation. Third‑party submissions and submissions by prescribed bodies were made; one third‑party (the Applicant) made submissions in English and Irish.

Company B appointed inspectors who produced a report (dated 23 December 2024) recommending grant of permission subject to conditions. Company B issued an order granting permission on 25 February 2025 in English only; an Irish language version was published on Company B's website on 9 July 2025 and the parties were notified. The Applicant issued proceedings on 23 April 2025 seeking, inter alia, certiorari quashing the decision, declarations including constitutional and EU law challenges (in particular relating to Irish language publication and alleged deficiencies in Appropriate Assessment and EIA) and costs. Module directions and case management steps followed; multiple affidavits and submissions were filed by the parties. The State conceded a declaration limited to site‑specific conservation objectives for one SPA (the Gearagh SPA) being published after the decision. The hearing of Module I issues took place on 3 December 2025 and judgment was delivered on 17 December 2025 by Judge Humphreys.

Legal Issues Presented

1. Whether the decision of Company B dated 25 February 2025 should be quashed on domestic grounds because the Board Order was issued initially in English only and not simultaneously in Irish (constitutional and statutory challenge).
2. Whether Company B unlawfully delegated or failed to exercise discretion regarding an oral hearing (this ground was not pursued).
3. Whether the Appropriate Assessment (AA) conducted by Company B was defective so as to contravene Article 6 of the Habitats Directive and related transposing provisions (including alleged failure to dispel reasonable scientific doubt in relation to particular SPAs and species).
4. Whether the Environmental Impact Assessment (EIA) was defective (claims included alleged failure to assess certain risks such as landslide risk and effects on particular bird species); this ground was largely withdrawn except for a limited point on a turbine relocation condition.
5. Whether the State respondents (national authorities) failed to have in place site‑specific conservation objectives and conservation measures for the Gearagh SPA (and whether non‑qualifying species present in a significant manner were properly considered).
6. Whether certain provisions of the Official Languages (Amendment) Act 2021 and associated commencement instruments were invalid, and consequences for Company B's language obligations.

Arguments of the Parties

Applicant (Company A)'s Arguments

• The order was made initially in English only despite bilingual policies and the site's location mainly in a Gaeltacht area; this breached constitutional and statutory language obligations and fair procedures.
• The AA and EIA were defective: the assessments did not dispel reasonable scientific doubt concerning potential adverse effects on the Mullaghanish to Musheramore Mountains SPA and the Gearagh SPA and on particular species (including Hen Harrier, Golden Plover and Merlin), and therefore the consent was unlawful under EU law.
• The State had not put in place necessary site‑specific conservation objectives/conservation measures for the Gearagh SPA at the time of the decision.
• Certain statutory language changes brought into force by commencement instruments were advanced as procedurally invalid and thus the reinstatement or continuation of prior language protections was sought.
• Relief sought included certiorari quashing the decision, declarations, costs, and stay of the decision pending determination.

Company B (Planning Body)'s Arguments

• Non‑publication in Irish at the moment of the order did not invalidate the decision; the missing Irish text was subsequently published and there was no prejudice to the Applicant.
• The AA and EIA were lawfully carried out; the inspector and Company B addressed the relevant matters on the material before them, including ecologist/scientist reports, the NIS and EIAR, and any alleged lacunae were not established by admissible expert evidence.
• The belated affidavit relied upon by the Applicant (Affiant 4) was inadmissible as ex post facto material and not a true reply; it introduced new evidence unreasonably late and should be excluded or afforded no weight.
• The Applicant failed to properly particularise certain EU law grounds and did not discharge the onus of proof to show defects in AA/EIA.
• Even if any shortcoming existed, it would be harmless error and quashing the consent would be disproportionate and contrary to the proper exercise of judicial discretion in light of wider policy (including climate context).

State Respondents (Company C, Company D, Company E)'s Arguments

• The State conceded a limited declaration that site‑specific conservation objectives for the Gearagh SPA were published only on 25 April 2025 (after the decision) but otherwise denied breaches of EU obligations.
• The State argued the Applicant's pleadings lacked sufficient particularity for some grounds; assertions of non‑transposition or failure to establish measures were not made out.
• The State maintained that conservation measures and SSCOs are not jurisdictional pre‑requisites for appropriate assessment and that the materials before Company B were sufficient.

Notice Party (Company F / Developer)'s Arguments

• The developer objected to late affidavits by the Applicant and argued the Applicant could and should have raised its technical points during the administrative process; late expert evidence was inadmissible.
• The developer supported Company B's position that AA and EIA were lawfully carried out on the material before Company B and that the Applicant had not displaced that assessment evidentially.
• The developer relied on its EIAR/NIS and further information responses, and on expert affidavits filed on its behalf, to show there was no reasonable scientific doubt about effects on the SPAs.

Table of Precedents Cited

Court's Reasoning and Analysis

The court structured its analysis by reference to an eight‑fold framework distilled from authority (jurisdictional requirements; legal correctness and workability; pleading adequacy; standing; material before the decision‑maker; onus of proof; harmless error; and discretion). The court then applied those principles to the facts and procedural history.

Key steps in the court's reasoning:

• Admissibility of late evidence: The court found the late affidavit filed by Affiant 4 (sworn 12 November 2025) to be, in large part, inadmissible or of no weight because it introduced ex post facto matters, was not a true replying affidavit, and the Applicant had failed to marshal such evidence at the appropriate procedural stage. Authorities on lateness and replying affidavits (including Oxigen and Kennedy) were followed.
• Pleadings and route‑map: The Applicant was held to be confined to its pleaded case. The court found several pleas to be inadequately particularised and lacking the necessary route‑map connecting alleged errors to the relief sought. The court emphasised the strict pleading requirements for complex EU law complaints.
• Onus of proof and evidence in AA/EIA challenges: The court reiterated that, save in defined exceptions, the onus is on the applicant to demonstrate inadequacy of AA/EIA (usually by admissible expert evidence or by showing a patent flaw on the face of the materials). Applying this, the court found the Applicant had not discharged the onus in relation to claims of scientific doubt or inadequacy concerning the SPAs and species at issue.
• Workability and standards: The court applied the workability principle to reject arguments that Company B should have constantly updated or autonomously applied foreign technical guidance (the NatureScot guidance) as a binding standard; the court noted such an approach would be unworkable absent prominence and acceptance of new standards.
• Irish language ground: The court accepted that bilingual policies exist but held that the absence of simultaneous Irish publication was an oversight rectified by subsequent publication (9 July 2025). The court concluded there was no legal breach that would justify certiorari; if any breach existed, it was harmless and discretionary considerations (including the climate/public interest context and lack of prejudice) weighed against quashing.
• Conservation objectives and measures (State concession): The State conceded that site‑specific conservation objectives for the Gearagh SPA were published only on 25 April 2025 (after the decision). The court ordered, by consent, a declaration to that effect. However, the court found that other complaints about absence of conservation measures or failure to consider non‑qualifying species significantly present were not established evidentially by the Applicant.
• Appropriate Assessment: On the substantive AA complaints (core ground 3), the court held that the materials before Company B, including the NIS, EIAR, further information and the Commission's ecologist and environmental scientist reports, enabled Company B to conclude there was no reasonable scientific doubt. The Applicant's post hoc assertions were insufficient to overturn that conclusion. Points concerning particular species (Hen Harrier, Merlin, Golden Plover) were rejected for lack of admissible evidence and because the decision‑maker had reasonably addressed those items on the material before it.
• EIA issues and turbine relocation condition: Core ground 4 was largely withdrawn. The remaining point concerning the minor relocation of Turbine T7 was inadequately pleaded and, in any event, the court found no established defect in the EIA or Company B's exercise of its conditioning power; the expert/material basis for an asserted landslide risk was not advanced by admissible evidence.
• Harmless error and discretion: The court applied the harmless error doctrine from EU and domestic jurisprudence (including Altrip and related authority) and concluded that any procedural or technical shortcomings alleged by the Applicant were either rectified, immaterial, or would be disproportionate to remedy by certiorari. The court emphasised that, where an error is shown, the onus shifts to the opposing parties to demonstrate harmlessness; Company B and the developer provided evidence sufficient for the court to conclude no reasonable possibility existed that the outcome would have been different.

Holding and Implications

HOLDING:

(i) By consent, a declaration was made that until 25 April 2025 the State respondents had not put in place site‑specific conservation objectives for the Gearagh SPA (the declaration was accepted by the State).

(ii) The proceedings were otherwise dismissed in Module I: core ground 1 (Irish language) was dismissed; core ground 2 was withdrawn; the bulk of core ground 3 (AA) and core ground 4 (EIA) were dismissed on evidential, pleading and admissibility grounds save insofar as further issues remain to be addressed in relation to a previously modularised "Power" issue; core ground 5 was dealt with by the consent declaration and the balance dismissed; core ground 6 was dismissed as academic in light of the court's disposition.

Implications:

• Direct effect: The planning decision of Company B stands; only a limited declaratory concession regarding the timing of publication of the Gearagh SPA SSCOs was recorded. The Applicant's wider challenge did not result in quashing the permission in Module I.
• Evidence and procedure: The judgment emphasises strict adherence to case management, timely presentation of evidence (especially expert evidence) and the requirement for clear pleadings linking facts to relief in judicial review, especially in environmental/EU law contexts.
• Harmless error and discretion: The court reaffirmed that not every procedural or technical error requires quashing; courts may rely on material from developers or State parties to exclude a reasonable possibility that an error affected outcome, and they retain discretion to refuse certiorari where disproportionate.
• No new legal principle: The court applied existing doctrines (pleading rigour, onus of proof, harmless error, deference on evaluative judgments and procedural admissibility). The judgment clarifies application of those doctrines in the specific factual matrix but does not purport to establish novel legal rules beyond the application of existing authority.

Order

• A declaration (by consent) was made regarding absence of Gearagh SPA SSCOs until 25 April 2025.
• The proceedings were otherwise dismissed in Module I (subject to reserved issues in relation to a modularised "Power" issue and related standing question to be addressed in a further module).
• Costs: the court made provisional cost directions (some costs reserved) and preserved certain cost questions for written submissions.
• Case management: the matter was listed for mention and perfection of the order was postponed pending outcome of the final module.

Notes on Anonymisation and Source

All references to parties, bodies and individuals in this summary have been anonymised and rendered in neutral placeholders consistent with the source text and the requirement to avoid use of personally identifying information. The summary was prepared strictly from the content of the provided judgment text and does not add factual material beyond that judgment.