Another significant reason behind delay in construction of these 30 projects is non-availability of land for compensatory afforestation.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/green-nod-holding-30-hydel-power-projects
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydroelectricity
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/compensatory-afforestation
[5] http://admin.indiaenvironmentportal.org.in/thesaurus/environment-clearance-ec
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/arunachal
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment