EirGrid PLC 2025-09-30 EirGrid PLC 2024-10-012025-09-30 EirGrid PLC 2024-10-012025-09-30 Ireland EirGrid PLC 2025-09-30 Ireland iso4217:EUR xbrli:pure

REPORT ON CORPORATE INCOME TAX INFORMATION

in compliance with chapter 10a of Directive 2013/34/EU (‘country-by-country reporting’)

Section 1. General information

Name of ultimate parent of group / of standalone companyEirGrid PLC
Country of registered office of ultimate parent undertakingIreland
Date of start of financial year2024-10-01
Date of end of financial year2025-09-30
Reporting currencyEUR
Application of option to report in accordance with taxation reporting instructionstrue
Name and registered office of a single subsidiary undertaking which has published the report on income tax information of an undertaking that is not governed by the law of a Member State-
Name and address of a single branch which has published the report on income tax information of an undertaking that is not governed by the law of a Member State-
Language of reporten

Section 2. Overview of information on a country-by-country basis

Name of Member State or tax jurisdiction Country code of Member State or tax jurisdiction Revenues Profit (loss) before tax Income tax paid (on cash basis) Income tax accrued – current year Accumulated earnings Number of employees
Ireland IE 1592892174 430243298 80575935 66900300 860352250 760
All other tax jurisdictions (aggregated basis)
25414193 -1125366 0 0 35911106 0

Section 3. List of subsidiaries and activities

Name of Member State or tax jurisdictionCountry code of Member State or tax jurisdictionName of subsidiary undertakings consolidated in financial statements of ultimate parent undertakingBrief description per country of nature of activities in Member State or tax jurisdiction
Ireland IE 1. EirGrid plc 2. EirGrid Interconnector DAC 3. EirGrid Telecoms DAC 4. Celtic Interconnector DAC 5. EirGrid Celtic Interconnector DAC 6. EirGrid SPV 2022 DAC 1. Holding shares or other equity instruments - The company's principal activity is to deliver quality connection, transmission and market services in Ireland and Northern Ireland. 2. The company's principal activity is to own and maintain the East-West Interconnector (EWIC) asset, linking the electricity grids of Ireland and Britain. 3. The company's principal activity is to manage the license of the commercial fibre optic cable for the EWIC project. 4. The company's principal activity is to procure, administer, manage and contribute to the design, development and construction of the Celtic Interconnector. 5. Dormant 6. The Company was set up for the purposes of procuring the delivery of temporary emergency generation.

Section 4. Omitted information

Disclosure of type of information omitted
Information omittedInformation omitted, other tax jurisdictionsExplanation of reason for omission of information
---
Disclosure of information omitted for previous financial years
-

Section 5. Explanations for material discrepancies between income tax paid and accrued

Explanation of any material discrepancies between income tax paid and accrued
-