Along with CIL, Neyveli Lignite Ltd has also been awarded Navratna status, it was announced at a PSUs' function attended by President Pratibha Patil here.
Another PSU Pawan Hans Helicopters has received Mini-ratna tag.
She said the honour given to these PSUs recognised their performance over the years.
Once a company gets the Maharatna status, its board would not be required to take the government's permission for investments up to Rs 5,000 crore in a joint venture project or wholly-owned subsidiary. For the Navratna companies, the limit is Rs 1,000 crore.