8 June 2026

Gresham House Energy Storage Fund plc

(GRID or the Company)

Completion of the first three Joint Venture transactions

Gresham House Energy Storage Fund plc (LSE: GRID), the UK's largest fund investing in utility-scale battery energy storage systems (BESS), is pleased to announce the completion of the acquisition of 25% stakes in each of the holding companies which own Cockenzie, Elland 2 and Monets Garden by Summit Transition Partners (STP).

This follows the announcement of the exclusivity agreement on 27 May 2026.

Background on the strategic partnership with STP

STP is a joint venture between Sumitomo Corporation, an integrated trading and investment company engaged in diverse businesses with a strong global network, and Taiwan based TPK Holdings, a leading manufacturer specializing in touchscreen technology and supply chain management.

STP will provide equity funding for certain pipeline projects, as well as providing access to significant international energy expertise. The partnership represents a further endorsement of GRID's market-leading platform, proven track record and continued growth strategy.

In addition to the first three projects which STP now holds a 25% stake in, STP also has exclusivity in respect to a 25% holding of Lister Drive (57MW/114MWh) and Ocker Hill (240MW/480MWh) based on similar agreed economic terms. These investments are expected to conclude at a later date once financing is arranged.

ENDS

For further information, please contact:

Gresham House Energy Transition

Ben Guest                                                                   +44 (0) 20 3837 6270
James Bustin

Harry Hutchinson

Jefferies International Limited

Gaudi Le Roux                                                            +44 (0) 20 7029 8000
Stuart Klein
Harry Randall 

Peel Hunt                                                                  

Luke Simpson                                                             +44 (0) 20 7418 8900

Huw Jeremy                          

KL Communications                                                            [email protected]
Charles Gorman                                                         +44 (0) 20 3882 6644
Charlotte Francis

JTC (UK) Limited as Company Secretary                         [email protected]
Ruth Wright                                                     +44 (0) 20 7409 0181

LEI: 213800MSJXKH25C23D82

About the Company and the Manager

Gresham House Energy Storage Fund plc aims to invest in a diversified portfolio of utility-scale battery energy storage systems (known as BESS) located in Great Britain and internationally. The Company seeks to provide investors with the prospect of capital growth through the re-investment of net cash generated in excess of its target dividend in accordance with the Company's investment policy.

Gresham House Asset Management Ltd is the FCA authorised operating business of Gresham House Ltd, a specialist alternative asset manager. Gresham House is committed to operating responsibly and sustainably, taking the long view in delivering sustainable investment solutions.

www.greshamhouse.com

Definition of utility-scale battery energy storage systems (BESS)

Utility-scale battery energy storage systems (BESS) are the enabling infrastructure that will support the continued growth of renewable energy sources such as wind and solar, essential to the UK's stated target to reduce carbon emissions. They store excess energy generated by renewable energy sources and then release that stored energy back into the grid during peak hours when there is increased demand.