The expansion was permitted in 2015, and construction was planned to begin in July 2015. APGENCO said the new plant will be built in four years at a cost of Rs 5,200 crore.<ref>[http://www.thehansindia.com/posts/index/2015-06-13/NTTPS-to-start-800-mw-project-works-by-July-157010 "NTTPS to start 800 mw project works by July,"] Hans India, June 13, 2015</ref> As of May 2016 there are no news that construction has begun. In July 2016 the Hindu reported that construction would begin soon.<ref>[http://www.thehindu.com/todays-paper/tp-national/tp-andhrapradesh/genco-aims-2-200-mw-capacity-addition/article8287307.ece "Genco aims 2, 200 MW capacity addition,"] The Hindu, Feb 27, 2016</ref>
The March 2017 Broad Status states engineering work on the unit is under way.<ref>[http://www.cea.nic.in/reports/monthly/broadstatus/2017/broad_status-03.pdf "Monthly Report on Broad Status of Thermal Power Projects in the Country,"] Government of India Ministry of Power, March 2017</ref> Boiler erection started on May 22, 2017.<ref>[http://www.cea.nic.in/reports/monthly/broadstatus/2017/broad_status-11.pdf "Monthly Report on Broad Status of Thermal Power Projects in the Country,"] Government of India Ministry of Power, November 2017</ref> According to the Hindu, construction has been expedited and the new unit is planned for commissioning in 2019.<ref>[http://www.thehindu.com/news/national/andhra-pradesh/800-mw-unit-of-nttps-likely-to-be-commissioned-early-2019/article22525243.ece "800 MW unit of NTTPS likely to be commissioned early 2019,"] The Hindu, Jan 26, 2018</ref>
===Opposition to expansion===