THIS ANNOUNCEMENT IS NOT AN OFFER FOR SALE OR SUBSCRIPTION OR SOLICITATION TO PURCHASE SHARES IN ANY JURISDICTION.

2 December 2022

Website upgrade

HydrogenOne Capital Growth plc ("HydrogenOne" or the "Company"), the first London-listed fund investing in clean hydrogen for a positive environmental impact, is pleased to announce that its upgraded website is now live and can be accessed on the following link: https://hydrogenonecapitalgrowthplc.com/.

The upgraded website includes Investor Email Alerts feature. The Company encourages its investors to register to this feature to receive alerts for its future announcements. To do so, please follow the link: https://hydrogenonecapitalgrowthplc.com/investors/investor-alerts/.

The Company's LEI is 213800PMTT98U879SF45.

For further information, please visit www.hydrogenonecapitalgrowthplc.com or contact:

About HydrogenOne:

HydrogenOne is the first London-listed hydrogen fund investing in clean hydrogen for a positive environmental impact. The Company was launched in 2021 with an investment objective to deliver an attractive level of capital growth by investing in a diversified portfolio of hydrogen and complementary hydrogen focussed assets. INEOS Energy is a strategic investor in HydrogenOne. The Company is listed on the London Stock Exchange's main market (ticker code: HGEN). The Company is an Article 9 climate impact fund.

IMPORTANT NOTICE

This announcement does not constitute an offer to sell, or the solicitation of an offer to acquire or subscribe for, shares in the Company in any jurisdiction. The distribution of this announcement outside the UK may be restricted by law. No action has been taken by the Company that would permit possession of this announcement in any jurisdiction outside the UK where action for that purpose is required. Persons outside the UK who come into possession of this announcement should inform themselves about the distribution of this announcement in their particular jurisdiction.

This announcement contains (or may contain) certain forward-looking statements with respect to certain of the Company's plans and/or the plans of one or more of its investee companies and their respective current goals and expectations relating to their respective future financial condition and performance and which involve a number of risks and uncertainties. The Company cautions readers that no forward- looking statement is a guarantee of future performance and that actual results could differ materially from those contained in the forward- looking statements.