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Company Presentation Company Presentation TTW Public Company Limited March 2020 Krathumban Water Treatment Plant

Disclaimer  This presentation includes some forward-looking statements relevant to future events such as plans, business strategies, expectations, etc. Thus, actual situations may differ from what is projected in this presentation due to the unexpected environment which might be better or worse than anticipated. Investors or material users should be meticulous on any herein information.  This presentation, which is prepared by the company, is only used for investment information. Also, the information included in this forward-looking statement may be changed by TTW Public Company Limited without notice and then the company does not take any duty to update any relevant information. 2 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Agenda COVID-19 Situation Company Overview Operating and Financial Performance 3 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

COVID-19 Situation  TTW has not been affected by the COVID-19 and drought  Our sales volume doesn’t decrease as compared with the same period of 2019 4 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

COVID-19 Situation 5 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

COVID-19 Situation SET circuit breaker has been activated three times in March 2020 to handle high-volatility trading Reason: SET index has decreased by SET Index TTW's Price Temporary halt No. Date SET Circuit Breaker trading period ( Points ) (Close / Baht) Points % 1,200.00 13.50 30 Mins 1 12-Mar-20 -125.05 -10% 1,124.84 13.00 13.00 (14.38-15.08) 1,150.00 13.00 30 Mins 1,124.84 12.60 2 13-Mar-20 -111.52 -10% 1,003.39 12.60 (09.59-10.29) 1,100.00 12.50 30 Mins 3 23-Mar-20 -90.19 -8% 1,024.46 11.40 (15.25-15.55) 1,050.00 12.00 1,024.46 Earlier Level 1: Trigger Value -10% Halt Action 30 mins 1,000.00 11.50 1,003.39 Level 2: Trigger Value -20% Halt Action 60 mins 11.40 * After resume trading, brokers or investors can send orders as normal until closing 950.00 11.00 New 18 Mar 2020: SET tweaks Circuit Breaker rules again after heavy sell-off 900.00 10.50 ( The revised regulations will take effect 18 Mar 2020 and run until 30 Jun 2020 ) Level 1: Trigger Value -8% Halt Action 30 mins Level 2: Trigger Value -15% Halt Action 30 mins SET revises Level 3: Trigger Value -20% Halt Action 60 mins SET Index TTW's Price Circuit Breaker rules * After the third level, SET will continue trading until the market closes that session To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses 6 *At the end of 31 March 2020, TTW stock price ends at 12.70 Bt.

Agenda Highlights Company Overview Operating and Financial Performance 7 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview – Key Milestone TTW’s Net Profit vs Price Unit: Baht Unit: MB Sep’19 : Increased 16.00 3,500 CKP Shares to 2 4 . 98% Sep’00 : Company established & Entered into WPSA with PWA May’15 : Increased CKP Shares & 14.00 oversubscribed to 25.31 % CKP Shares 3,000 Jan’04 : 12.00 First Day of Sale ( Design Cap. = 320K / Day ) 2,500 COVID-19 Outbreak 10.00 ( Pandemic ) Jul’04 : 2,000 Sep’10 : First Expansion Completed Official COD Mar’14 : Changed the Jun’17 : The Construction of 2 nd Water ( Design Cap. = 320K / Day  440K / Day ) 8.00 Company’s Name to “ TTW ” Treatment Plant has been Completed 1,500 Feb’06 : ( Design Cap. = 440 K / Day  5 40K / Day ) May’08 : Listed in SET 6.00 Acquired Water Flow Co., Ltd. 1,000 4.00 Jul’06 : Sep’11 : Acquired 30% CKP Shares Converted to Plc. Aug’ 09 : Acquired BIE Rights 500 2.00 Dec’08 : Second WPSA with PWA Feb’07 : - Acquired 98 % PTW Shares ) 0.00 - 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 ( IPO ) Net Profit Price As at Mar 31, 2020 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses 8

Company Overview – Our Business Operates Produces and Investment in Distributes Tap water and Other business Tap water Waste water 9 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview – Shareholder Structure MITSUI, 25.98% CK, 19.40% Free Floated, 36.15% BEM, 18.47% TTW Public Company Limited Produces and distributes tap water 3,99 0 MB. Registered Capital PTW CKP TWO 98%* 24.98% 68% 32% Pathum Thani Water Company Limited Thai Water Operations Company Limited CK Power Public Company Limited Produces and distributes tap water Operates tap water and waste water Power Holding company 1 ,200 MB. Registered Capital treatment systems 6 0 MB. 9,240 MB. Registered Capital Registered Capital 8,129 MB. Paid-up capital * 2% is owned by PWA As of Dec 3 1 , 2019 10 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview – Current Project 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 2022 2024 2026 2028 2030 2032 2034 2036 2038 2040 TTW PTW BIE *Design Cap. 440,000 m 3 /Day Pathum Thani Water Treatment Plant Banglen Water Treatment Plant Krathumban Water Treatment Plant Bangpa-in Industrial Estate Company TTW PTW TTW Business Service Tap water Supply Tap water Supply Tap Water & Waste Water Management Contract Type BOO BOT Rights ( Operating Lease ) Contract Period 2004 – 2034 (30 yrs.) 1998 – 2023 (25 yrs.) 2009 – 2039 (30 yrs.) Contract Customer Whole sale to PWA Whole sale to PWA BIE Investment Scheme Production, Transmission and Distribution Production and Transmission N/A Distribution Area West Bangkok ( Nakhon Pathom – Samut Sakhon ) North Bangkok ( Pathum Thani – Rangsit ) BIE ( Bang Pa-In Industial Estate, Ayutthaya ) Design Capacity *540,000 m 3 /day 488,000 m 3 /day TW: 48,000 m 3 /day, WW: 18,000 m 3 /day 11 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview - Location Bangpa-in  3 Companies Industrial Estate  5 Locations in Water Business Phra Nakhon (BIE, Ayutthaya ) Sri Ayutthaya (BIE) Pathum Thani Water Pathum Thani Treatment Plant (PTW) (PTW, Pathum Thani) Amata City Industrial Estate ( Chonburi, Rayong ) Nakhon Pathom  1 Company in Energy Business Bangkok (TTW) Krathumban Water Treatment Plant (TTW, Samut Sakhon) Samut Sakhon Banglen Water Treatment (Krathumban) Plant (TTW, Nakhon Pathom) 12 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview – Portion of Water Users Samut Sakhon – Nakhon Pathom (%) Pathum Thani - Rangsit (%) • Klongluang Utilities • Thammasat University ( Rangsit ) ( West BKK ) ( North BKK ) • Thai Union Group • Greensport • National Housing Authority • Pataya Food Industries • Thainamthip Manufacturing • Future Park Rangsit • Unicord • Elec & Eltek (Thailand) • Rangsit University • Pakfood • Hoya Lens ( Thailand ) 17 • Asian Institute of Technology • Better Foods 21 • etc. • Zeer Rangsit 43 • etc. • etc. Serving over 500,000 Water Users or 41 Millions of Lives 16 62 • Pinehurst golf club & Hotel • Mahidol University ( Salaya ) • Summit Starhome • Nadee Municipality ( Waterworks ) • Pruksa Real Estate • etc. etc. Industrial Household Commercial Industrial Commercial Household *As of March 2020 13 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses

Company Overview – The Leading Position of Water Business in Thailand Capacity of Private Tap Water Companies Starting at 100 ,000 m 3 /Day Unit: m 3 /day 1,076,000 m 3 /day + 100 ,000 UU Universal Utilities Group (Subsidiary of East Water Group) + 100 ,000 BW Bangpakong Water Supply + 100 ,000 600,000 CW Chachoengsao Water Supply 488,000 500,000 ET EGCOM TARA 440,000 400,310 403,910 NW Nakornsawan Water Supply Krathumban Water Treatment Plant 400,000 400,000 IWR Industrial Water Resource Management REQ R.E.Q Water Service The Krathumban Water Treatment Plant ( TTW 2 nd ) 300,000 Source : PWA, YE2019 Company Presentation of East Water, www.uu.co.th Others can be expanded the design capacity up to 400,000 m 3 /day 200,000 NW  Hybrid Technology : Conventional + ET 30,000 28,000 Ultrafiltration ( Membrane Technology ) CW 100,000 BW 43,200  Cleaner: Because the membrane pore size is 30,000 48,000 28,000 30,000 28,000 100,000 East Water & UU IWR REQ only 0.01 micron so it can effectively 0 Group contaminants viruses and bacteria TTW TTW 2 nd PTW BIE TTWTTW 2nd PlantPTW UU BW CW ET IWR REQ  Safer: Less chemical usage Plant At present In the future Peers 14 To be Thailand’s Leading Company in Water, Energy and Eco -Friendly Businesses