Transaction in Own Shares

SDCL Energy Efficiency Income Trust plc

("SEEIT" or the "Company")

Transactions in own shares

SEEIT announces that on 8 September 2023 it purchased the following number of its Ordinary Shares of £0.01 each on the London Stock Exchange through Jefferies International Limited.

The Company intends to hold the purchased shares in treasury.

Following the purchase and settlement of these shares, the Company's total issued share capital will comprise of 1,108,709,053 Ordinary Shares of £0.01 each. This figure includes 23,289,495 Ordinary Shares held in treasury, leaving a balance of 1,085,419,558 Ordinary Shares with voting rights.

The total voting rights figure of 1,085,419,558 may be used by shareholders for the calculations by which they will determine if they are required to notify their major interest in, or a change to their major interest in, the Company under the FCA's Disclosure Guidance and Transparency Rules.

This completes the £20 million Buyback Programme announced on 3 April 2023.

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About SEEIT

SDCL Energy Efficiency Income Trust plc is a constituent of the FTSE 250 index. It was the first UK listed company of its kind to invest exclusively in the energy efficiency sector. Its projects are primarily located in the UK, Europe and North America and include, inter alia, a portfolio of cogeneration assets in Spain, a portfolio of commercial and industrial solar and storage projects in the United States, a regulated gas distribution network in Sweden and a district energy system providing essential and efficient utility services on one of the largest business parks in the United States.

The Company aims to deliver shareholder value through its investment in a diversified portfolio of energy efficiency projects which are driven by the opportunity to deliver lower cost, cleaner and more reliable energy solutions to end users of energy.

Past performance cannot be relied on as a guide to future performance.

Further information can be found on the Company's website at www.seeitplc.com.

Investment Manager

SEEIT's investment manager is Sustainable Development Capital LLP, an investment firm established in 2007, with a proven track record of investment in energy efficiency and decentralised generation projects in the UK, Continental Europe, North America and Asia.

SDCL is headquartered in London and also operates worldwide from offices in New York, Dublin, Hong Kong and Singapore. SDCL is authorised and regulated in the UK by the Financial Conduct Authority.

Further information can be found on at www.sdclgroup.com.