Inception of Omkareshwar Project dates back to year 1955, when CWPC prepared a report on hydroelectric potential of entire Narmada river and the project has been mentioned as "Barwaha". It was also seconded in Khosla Committee report in 1965.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/conceptualization-project
[2] http://admin.indiaenvironmentportal.org.in/category/author/k-chouksey
[3] http://admin.indiaenvironmentportal.org.in/category/author/i-d-dayal
[4] http://admin.indiaenvironmentportal.org.in/category/author/raghu-prathi
[5] http://admin.indiaenvironmentportal.org.in/category/journal/water-and-energy-international
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/narmada
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/omkareshwar
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydrology
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dams-irrigation