No. WHAUP-CS014-2562 1 8 August 2019 Re Share Acquisition in Duong River Surface Water Plant JSC in Vietnam Dear President The Stock Exchange of Thailand WHA Utilities and Power Public Company

( Translation ) Ref. No. HARN 011/2019 14 November 2019 Subject: Notification about Related Parties Transaction To: Director and Manager The Stock Exchange of Thailand (“the SET”) The committee of

entitled for subscription of new ordinary shares (Record Date) and Subscription period To: The President of the Stock Exchange of Thailand Enclosure: 1. No. For. 19/2018 Capital Increase, Waiver from

Determination of the Date of Extraordinary General Meeting of Shareholders No. 1/2018 To: President The Stock Exchange of Thailand Enclosures: 1. Information Memorandum on the Offering of Newly Issued Ordinary

Ref. MD 115/2017 August 25, 2017 Re: Clarification on the Financial Performance of the Company and its subsidiaries as of Year 2015 Attn: President The Stock Exchange of Thailand We, K. C. Property

(Translation) No. MD119/2560 August 29, 2017 Re: Clarification on the Financial Performance of the Company and its subsidiaries as of Year 2015 Attn: President The Stock Exchange of Thailand We, K. C

ที่ - Translation - PorBor.076 / 2017 November 14, 2017 Subject: Clarification of operating results change from the same period last year by more than 20% To: President The Stock Exchange of Thailand

May 15, 2019 Subject: Managing Discussion and Analysis for Q1/2019 To: Managing Director The Stock Exchange of Thailand The company would like to report to operation results for the company and

Company’s land To: The President The Stock Exchange of Thailand The Board of directors meeting # 8/2019 held on June 4, 2019 has a resolution to sell a piece of land to increase liquidity and reduce the

1 / 2 IR.017/2019 13 August 2019 Re: Notification of the changes of the Profit and Loss Statement To President The Stock Exchange of Thailand We, T Engineering Corporation Public Company Limited (the