GR ENGINEERING SERVICES LIMITED — Capital/Financing Update 2026

May 3, 2026

GR ENGINEERING SERVICES
ENGINEERING CONSULTANTS AND CONTRACTORS

ASX RELEASE

4 May 2026

For immediate release to the market

Sturt Plateau Compression Facility - Beetaloo Basin

Provision of Operations and Maintenance Services

GR Engineering Services Limited (ASX: GNG) (GR Engineering) is pleased to announce that its wholly owned subsidiary, GR Production Services Pty Ltd (GRPS), has been awarded a five-year contract by Sturt Plateau Compression Facility Sub Pty Ltd as trustee for the Sturt Plateau Compression Facility Sub Trust (SPCF Co), an entity indirectly owned 50% by Tamboran Resources Corporation (ASX: TBN) and 50% by Daly Waters Infrastructure, LP, for the provision of operations and maintenance services (O&M services) to the Sturt Plateau Compression Facility, located in the Beetaloo Basin, Northern Territory.

The estimated contract value over the five-year period is $57 million. The contract includes an option to extend the agreement by a further three years.

GRPS will assume responsibility for the operation of the Sturt Plateau Compression Facility, including with respect to regulatory compliance, production performance, maintenance, asset integrity management and HSE compliance. GRPS has previously supported SPCF Co through completion of the operational readiness phase of the Sturt Plateau Compression Facility, establishing operational capability.

Commenting on the contact award, GRPS Chief Executive Officer, Cameron Wills, said:

"GRPS is proud to partner with SPCF Co on a project that will play an important role in unlocking the significant gas potential of the Beetaloo Basin in the Northern Territory. We are pleased to continue our collaboration, safely operating and maintaining SPCF Co's assets while contributing to sustainable growth and strong performance outcomes."

GR Engineering's Managing Director, Tony Patrizi, stated:

"We look forward to operating and maintaining the Sturt Plateau Compression Facility and working closely with SPCF Co to deliver safe, reliable, and successful outcomes over the life of the project. The award of this O&M contract further establishes GRPS' capabilities of being a strong and reliable service provider to our Australian energy sector."

Ends.

For further information please contact:

Tony Patrizi
Managing Director
+61 8 6272 6000
tony.patrizi@gres.com.au

Omesh Motiwalla
CFO & Company Secretary
+61 8 6272 6000
omesh.motiwalla@gres.com.au

GR ENGINEERING SERVICES LIMITED ABN 12 121 542 738
Tel: +61 8 6272 6000 Fax: +61 8 6272 6001 Email: gres@gres.com.au Website: www.gres.com.au
PO Box 258, Belmont WA 6984 71 Daly Street, Ascot WA 6104
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