Case Details

Lansdowne Oil & Gas PLC and Lansdowne Celtic Sea Limited v. Ireland (ICSID Case No. ARB/26/21)

Subject of Dispute:

Oil and gas enterprise
Economic Sector:

Oil, Gas & Mining
Instrument(s) Invoked:

ECT (Energy Charter Treaty)
Applicable Rules:

ICSID Convention - Arbitration Rules

(a) Original Proceeding

Claimant(s)/Nationality(ies):

Lansdowne Oil & Gas PLC (British), Lansdowne Celtic Sea Limited (British)
Respondent(s):

Ireland (Irish)
Date Registered:

May 8, 2026

Party Representatives

Claimant(s):

Mantle Law (UK), London, U.K.
Diamond McCarthy, Washington, D.C. and Houston, TX, U.S.A.
Respondent(s):

Chief State Solicitor, Dublin, Ireland
Status of Proceeding:

Pending
Latest Development:

May 8, 2026 -
The Acting Secretary-General registers a request for the institution of arbitration proceedings.

No References Available.

(a) Original Proceeding

Date	Development
May 8, 2026	The Acting Secretary-General registers a request for the institution of arbitration proceedings.