increase in volume of electricity and steams sales and the higher natural gas price. Rayong Central Utility Plants: SPP Q2/17 Q1/18 Q2/18 Change +/(-) 1H/17 1H/18 Change +/(-) QoQ YoY YoY Key revenue drivers
57.6 664.6 58.9 1,942.9 57.2 1,935.4 59.3 > Natural Gas Power Plant 2.3 0.2 1.2 0.1 6.4 0.2 3.2 0.1 > Solid Waste Power Plant 25.3 2.2 24.4 2.1 76.8 2.2 75.2 2.3 > Solar Energy Power Plant 1.8 0.2
% Gas cost Baht/mmBtu 251.99 235.45 -6.6% 2.2) Cost structure 6M'2016 6M'2017 % change million Baht % million Baht % % Cost of sales and services Natural gas 8,166 72% 9,040 70% 10.7% Cost of electricity
% change million Baht million Baht y-on-y million Baht million Baht q-on-q Cost of sales and services Natural gas 13,723 15,918 16.0% 5,283 5,906 11.8% Cost of electricity- Vietnam 793 784 -1.1% 269 280 4.1
natural gas cost. This also caused the gross profit margin for 9 months to increase from 25% in 2016 to be 27% in 2017. 12 Operating performance Q3/16 Q2/17 Q3/60 Change +/(-) 9M/16 9M/60 Change +/(-) (Unit
2018 % change Q3’2018 Q4’2018 % change million Baht million Baht y-on-y million Baht million Baht q-on-q Cost of sales and services Natural gas 18,128 22,139 22.1% 5,906 6,221 5.3% Cost of electricity
EXECUTIVE SUMMARY 2 Q1’2017 Q1’2018 % change Q4’2017 Q1’2018 % change million Baht million Baht y-on-y million Baht million Baht q-on-q Sales and service income 7,651 8,156 6.6% 7,762 8,156 5.1% EBITDA 2,133
Q1’2018 Q2’2018 % change million Baht million Baht y-on-y million Baht million Baht q-on-q Cost of sales and services Natural gas 9,040 10,011 10.7% 4,728 5,283 11.7% Cost of electricity- Vietnam 518 504
overhaul in Q4/2018 and higher natural gas prices. Sriracha Power Plant: IPP Operating Results by Plant Gross Profit Operating performance Q4/17 Q3/18 Q4/18 Change +/(-) 2017 2018 Change +/(-) (THB million