Following is an excerpt from a report in Kalinga Times.

National Aluminium Company Limited (NALCO), the flagship PSU of the Ministry of Mines and India ‘s largest manufacturer and exporter of alumina and aluminium, has been granted the Navratna status.

Navratna status is conferred on select Central Public Sector Enterprises (CPSE),on becoming significant players in the economic development of the country.

On achieving the status, certain powers are delegated to those CPSEs that had comparative advantages and capacity to become global giants.

As per the wikipedia entry on Navratna:

The ‘Navaratna’ status offers a company enhanced financial and operational autonomy and empowers it to invest up to Rs. 1000 cr or 15% of their net worth on a single project without seeking government approval. In a year, these companies can spend up to 30% of their net worth not exceeding Rs. 1000 cr. They will also have the freedom to enter joint ventures, form alliances and float subsidiaries abroad.