Planning Judicial Review of Renewable-Energy Permissions: Cumulative Thresholds for Relief, Strict Pleading/Proof, and Limits on Collateral Attacks on Policy Instruments

Case: Keogh and Ors v An Coimisiun Pleanala and Anor (Approved)
Citation: [2026] IEHC 339 (High Court, Humphreys J.)
Date: 29 May 2026

1) Introduction

This High Court judicial review challenged An Coimisiún Pleanála’s grant of permission for a seven-turbine wind farm in Co. Carlow to EDF Renewables Ireland Limited. The applicants were two local residents and an unincorporated residents/environmental group. Their objections spanned noise and human health, cumulative impacts, traffic and public safety, landscape policy compliance, microplastics, a factual “participating property” label relevant to shadow flicker mitigation, and an EU law challenge alleging that the 2006 Wind Energy Guidelines required SEA.

Humphreys J. treated the proceedings as a merits-driven disagreement reframed as legality arguments and analysed whether any pleaded and proven legal error rendered the permission unlawful. The challenge was dismissed, with the Court directing that the perfected order include a recital clarifying that the second applicant’s dwelling was not a “participating property” for the purposes of the shadow flicker condition.

2) Summary of the Judgment

  • Judicial review is legality-focused: the Court repeatedly emphasised the boundary between legality review and merits appeal.
  • Relief is conditional on cumulative thresholds: applying a structured “eight-fold path” (synthesising prior authority), the Court held the applicants failed multiple cumulative requirements, especially pleading, proof, and materiality.
  • Presumption of consideration: where the decision-maker records that submissions/material were considered, the onus is on the applicant to displace that presumption.
  • Development plan “material contravention”: where plan provisions point in different directions and involve evaluative judgment, “contravention” language may be inapt; the Commission’s reconciliation of objectives fell within its evaluative remit.
  • Guidelines and collateral challenges: the Commission must “have regard” to s.28 guidelines, but cannot be required in an individual appeal to determine their EU-law validity; SEA-based invalidity arguments were treated as impermissible collateral attacks absent proper parties/relief.
  • Discretion: even had an error been shown, the Court would have refused certiorari in discretion, citing (among other factors) failures to raise points properly in-process and the overriding public interest in renewable energy delivery in the climate-law context.

3) Analysis

3.1 Precedents Cited (and Their Role in the Reasoning)

A. Pleadings discipline and procedural clarity

The judgment is anchored in a line of Supreme Court authority requiring applicants to remain within clearly articulated grounds and to avoid “scattergun” cases:

  • 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 were used to confine the applicants to their pleaded case, and to require particular clarity where EU-law arguments are advanced.
  • 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 were invoked to criticise internally inconsistent, “throw-everything” argumentation.

Application in this case: any reliance on s.15(1) of the Climate Action and Low Carbon Development Act 2015 (as amended) was rejected as “wholly unpleaded”. The Court also declined to treat late procedural manoeuvres (including affidavits and attempted late points) as re-opening the litigation.

B. Legality, not merits; evaluative planning judgment and irrationality review

  • Amariei v. Chief Appeals Officer [2026] IESC 22, the State (Keegan) v. Stardust Compensation Tribunal [1986] I.R. 642, Meadows v. Minister for Justice, Equality and Law Reform [2010] IESC 3, and Sweeney v. Fahy [2014] IESC 50 supported the core proposition that judicial review targets legality and process, not the “better” substantive outcome.
  • Sherwin v. An Bord Pleanála [2024] IESC 13 framed review of “planning judgment” as typically irrationality-based where not tainted by legal/procedural error; this was central to the Court’s handling of development plan interpretation and assessment judgments.
  • Tesco Stores Ltd v. Secretary of State for the Environment [1995] 1 WLR 759 and the Court’s later discussion of Tesco Stores Limited v. Dundee City Council [2012] UKSC 13 were used to underline that weight and reconciliation of competing policies are classic matters for the planning decision-maker.

C. Onus of proof and the presumption of validity/consideration

  • G.K. v. Minister for Justice, Equality and Law Reform [2002] 2 I.R. 418 and Rana v. Minister for Justice [2024] IESC 46 supported a presumption that stated consideration occurred; the applicant must rebut it evidentially.
  • An Taisce v. An Bord Pleanála & Ors. [2022] IESC 8 (and the High Court/Supreme Court leave determinations referenced) were used to insist that alleged defects in EIA/AA typically must be established by the applicant, usually through admissible expert evidence or a patent flaw on the face of the record.
  • RAS Medical Ltd v. Royal College of Surgeons in Ireland [2019] IESC 4 was invoked to resolve evidential conflicts (absent cross-examination) against the party bearing the onus.

Application in this case: the applicants’ criticisms of noise assessment, health implications, and alleged EIA inadequacy were found not to meet the evidential burden.

D. Reasons: “main reasons on the main issues” and reasons found in the inspector’s report

  • Connelly v. An Bord Pleanála [2018] IESC 31, O'Keefe v. An Bord Pleanála [1993] 1 I.R. 39, and Faulkner v. Minister for Industry and Commerce 1997 WJSC-SC 962 grounded the “main reasons on the main issues” standard.
  • Oguekwe v. Minister for Justice, Equality and Law Reform [2008] IESC 25 and Rawson v. Minister for Defence [2012] IESC 26 were used to reject any requirement for a discursive, submission-by-submission response.
  • Sherwin v. An Bord Pleanála [2024] IESC 13 and Connelly v. An Bord Pleanála [2018] IESC 31 also supported the proposition that reasons may be located in the inspector’s report, not solely the final order.

E. Discretion to refuse relief; proportionality; failure to raise issues in-process

  • G. v. DPP [1994] 1 I.R. 374, Kelly v. Minister for Agriculture [2021] IESC 62, Ballyboden Tidy Towns Group v. An Bord Pleanála [2024] IESC 4, and Amariei v. Chief Appeals Officer [2026] IESC 22 framed judicial review remedies as discretionary within bounded constitutional/legal principles, not free-ranging merits review.
  • Save Cork City Community Association CLG v. An Bord Pleanála [2022] IESC 52 was used to support the idea that certiorari may be disproportionate for technical/non-material errors.

F. Climate-law context (but not as a pleaded ground here)

Although s.15(1) arguments were rejected as unpleaded, Humphreys J. situated the renewable-energy decision within a dense matrix of domestic and EU climate obligations, and relied on the Supreme Court’s synthesis in Coolglass Wind Farm Ltd v. An Coimisiún Pleanála [2026] IESC 5. That context informed (i) the interpretive approach to development plan tensions, and (ii) the Court’s discretionary stance against quashing absent clear illegality.

G. SEA collateral attack on the 2006 Guidelines

  • The Court treated the SEA complaint as an impermissible collateral challenge to ministerial guidance in an individual permission JR, absent appropriate relief and State parties.
  • It also relied on the CJEU’s statement in NJ and OZ v An Bord Pleanála and Others, C-9/22, ECLI:EU:C:2023:176 (St Teresa's Gardens) at §50, to support the view that non-binding guidance does not “set the framework” in the way necessary to trigger SEA obligations (on the applicants’ case as pleaded and argued).

3.2 Legal Reasoning: How the Court Reached Its Outcome

A. The “eight-fold path” as a practical decision framework

Drawing on prior High Court synthesis (notably Reilly v. An Coimisiún Pleanála [2025] IEHC 659), Humphreys J. articulated a cumulative set of requirements for JR relief: jurisdiction, legal correctness/workability, pleading specificity, standing on the point, material properly before the decision-maker, discharge of the onus of proof, materiality/harmlessness, and the discretionary balance.

The judgment’s significance lies less in doctrinal novelty than in the operationalisation of Supreme Court guidance into a step-by-step triage that is likely to influence how future planning/environment JRs are argued and managed.

B. Application to the substantive grounds

  • Planning history (Core Ground 2): factually incorrect (planning history and other wind farms were considered) and legally over-demanding (no general duty to distinguish past refusals in the way suggested). The earlier refusal concerned a different project on different lands in a different policy context.
  • Guidelines/noise submissions (Core Ground 3): the Court found no proof that submissions were ignored; rather, the inspector and Commission considered a range of materials (including ETSU-R-97, IOA guidance, WEDG 2006, WHO 2018, Draft 2019) and made an evaluative choice. Alleged “fettering” failed on the record.
  • “Participating property” misdescription (Core Ground 5): not validly raised in time; and, in any event, the operative planning condition applied to “existing nearby habitable dwellings (excluding participating properties)”, and the dwelling was not participating. The Court used a recital to prevent misunderstanding rather than quash.
  • Material contravention (Core Ground 6): the plan contained internally competing objectives (“not normally permissible” for uplands, but also supportive renewable energy and locationally-required elevated-site development). Reconciling such tension is evaluative; calling the outcome a “contravention” was misplaced on these facts. Even if a contravention existed, it was not shown to be “material” and discretionary factors would militate against certiorari.
  • EIA adequacy (Core Ground 1): the Court emphasised the burden to establish EIA deficiency; the inspector’s and Commission’s analysis of noise (including cumulative/night-time) and reliance on the EIAR and first-party appeal material were treated as lawful evaluative judgment.
  • Microplastics (Core Ground 4): not validly raised to the Commission on appeal; presumption of consideration was not displaced; and the claim lacked evidential foundation demonstrating likely significant effects requiring EIA treatment.
  • SEA challenge to WEDG 2006 (Core Ground 7): treated as an impermissible collateral attack and, substantively, inconsistent with the non-binding nature of s.28 guidelines and the CJEU approach in St Teresa's Gardens.

3.3 Impact

  • Practical tightening of planning JRs: the judgment is a roadmap for dismissing challenges that do not (i) plead with precision, (ii) prove factual premises, and (iii) demonstrate materiality—particularly in technical EIA/AA disputes where expert evidence is often decisive.
  • Development plan conflicts: it reinforces the idea that where development plan objectives pull in multiple directions, the decision-maker’s reconciliation is usually an evaluative judgment; “material contravention” arguments must engage with the text, context, and the planning judgment space identified in Sherwin v. An Bord Pleanála [2024] IESC 13.
  • Collateral EU-law attacks: applicants seeking to argue that national guidance is invalid for EU-law reasons must structure proceedings accordingly—proper relief, proper parties, and a pleaded route-map—rather than attempting to invalidate a permission indirectly.
  • Renewables and discretion: while legality remains the touchstone, the Court’s discretionary analysis signals that, absent demonstrable harm or outcome-determinative error, certiorari may be harder to obtain in renewable-energy permissions given the recognised climate-law imperative.

4) Complex Concepts Simplified

  • Judicial review vs appeal: JR asks “was the decision made lawfully?” not “was it the best decision?” (see Amariei v. Chief Appeals Officer [2026] IESC 22).
  • “Have regard to” vs “comply with”: many planning instruments (e.g. s.28 guidelines) must be considered, but are not binding rules. Treating them as mandatory can be a category error (unless the statute makes them binding).
  • Onus of proof: the applicant must prove the facts and legal defects relied upon; mere assertion does not establish EIA/AA inadequacy.
  • Presumption of consideration: if the decision says it considered submissions/material, the court generally accepts that unless the applicant proves otherwise (G.K. v. Minister for Justice, Equality and Law Reform [2002] 2 I.R. 418).
  • Material contravention: not every tension with a development plan triggers the special “material contravention” regime. Where plan provisions are flexible or conflicting, decision-makers often have a lawful evaluative space to reconcile them (Sherwin v. An Bord Pleanála [2024] IESC 13).
  • SEA/EIA/AA:
    • EIA assesses likely significant environmental effects of a project.
    • AA (Habitats Directive) requires scientific certainty to the “no reasonable scientific doubt” standard for European sites.
    • SEA assesses environmental effects of certain plans/programmes that set a framework for future development consent; the case illustrates the procedural and party-joinder hurdles in arguing SEA non-compliance indirectly.

5) Conclusion

Keogh and Ors v An Coimisiun Pleanala and Anor (Approved) [2026] IEHC 339 is a consolidation judgment on the disciplined architecture of planning/environmental judicial review: applicants must plead precisely, prove defects (often with expert evidence), show materiality, and overcome presumptions of validity and consideration. The Court’s treatment of development-plan tensions, guideline reliance, and collateral EU-law challenges—set against an explicit climate-law backdrop—signals a robust approach to preventing merits-based opposition from being repackaged as legality review, while leaving intact the possibility of intervention where genuine, pleaded, and proven legal defects are shown.