The Thailand Power Development Plan for 2015-2036 forecasts that the units 4-7 replacement will be operational in 2018. An additional replacement for units 8-9 is planned for completion in 2022.<ref>[http://www2.eppo.go.th/power/PDP2015/PDP2015_Eng.pdf "Thailand Power Development Plan, 2015-2036,"] Thailand Ministry of Energy, May 2015</ref><ref>[http://www.egat.co.th/en/index.php?option=com_content&view=article&id=36&Itemid=117 "Mae Moh Power Plant,"] EGAT website, accessed December 2016</ref>
The country's draft Power Development Plan 2018-2038 2037 still lists the units 4-7 replacement as planned for commissioning in 2018,<ref>[http://www.eppo.go.th/index.php/th/component/k2/item/13403-new-30-4-2018-pdp Draft of Power Development Plan 2018-2038,] Energy Policy and Planning Office, December 2018</ref> however in April 2019 EGAT said it was testing the operation of Mae Moh Power Plant Units 4-7 Replacement Project, with operation planned for 2019. The unit was described as 655 MW.<ref>[http://www.egat.co.th/en/news-announcement/news-release/egat-s-mae-moh-power-plant-units-4-7-replacement-project-proceeds "EGAT’s Mae Moh Power Plant Units 4-7 Replacement Project proceeds,"] EGAT, 01 April 2019</ref>
The Unit 8-9 replacement is also proposed to be 655 MW.<ref>[https://www.bangkokpost.com/business/news/1550310/egat-to-propose-coal-plant-upgrade "Egat to propose coal plant upgrade,"] Bangkok Post, 2 Oct 2018</ref> It is listed in the Thailand Power Development Plan for 2018-2037 as planned for commissioning sometime between 2026 and 2037. The Plan was approved in January 2019.<ref>[http://www.nationmultimedia.com/detail/Economy/30362896 "Power plan backed along wIth 2 plants,"] The Nation, January 25, 2019</ref>