THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION AS STIPULATED UNDER THE MARKET ABUSE REGULATION (EU NO. 596/2014) AS IT FORMS PART OF UK DOMESTIC LAW BY VIRTUE OF THE EUROPEAN UNION (WITHDRAWAL) ACT 2018 ("MAR").

28 May 2026

Gresham House Energy Storage Fund plc

(GRID or the Company)

2026 Capital Markets Webinar

The Company is hosting a Capital Markets webinar at 2.00pm (BST) today. The Company will provide an update to its growth plans and highlight the key role it plays in powering the renewable energy transition.

Specifically, the Company will be providing investors with further details on:

·    UK BESS industry market & regulatory developments and outlook

·    Progress on the Three-year Plan 

·    Its new Growth Plan and specifically discussing

o the Pipeline and funding strategy, including more detail on the exciting strategic partnership with Summit Transition Partners who are providing project level equity funding for the new projects, and

o  Alternative Revenues

To provide investors with the framework to evaluate the Company's prospects the Manager will discuss the following modelled outcomes on completion of the Growth Plan:

·    Capacity growth to 2,246MW / 4,399MWh, having added Rayleigh to the Pipeline

·    £141mn modelled EBITDA annual run rate which will require a fraction of the equity from GRID that had been previously assumed, maximising the Company's incremental, and overall, Return on Equity, a key focus for the Company

·    Base case NAV uplift from the upsized Pipeline in the region of 56p per share[1]

·    Confirmation of 10p free cash flow target

Further details on the assumptions, variables and key drivers underpinning this Growth Plan will be discussed on the webinar and included within the presentation. A recording will be made available on the company's website thereafter.

Investors are encouraged to register to attend here:

https://greshamhouse.zoom.us/webinar/register/WN_GPgaOb04SCOTzfnUQ44vMQ#/registration

John Leggate CBE, Chair of Gresham House Energy Storage Fund plc, commented:

"We are keen to set out the next phase of the Company's development and growth plans. The Company is launching an comprehensive programme of works, now fully financed, which is capable of delivering significant value to shareholders. We look forward to sharing more detail on our plans in the webinar later today."

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