The clearance for ETPS was given in 2009.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/tangedco-gets-reprieve-two-power-projects-ennore
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-indian-express-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ennore-tps
[6] http://admin.indiaenvironmentportal.org.in/thesaurus/environment-clearance-ec
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy