The first major change for these units under NTPC controlled management has been the drastic changes in the employee benefits and facilities. NTPC began their actual control of operation and management only after all the employee facilities had been created as per their own standards! And that is what makes NTPC different from other PSUs.
But that does not mean that NTPC or any other such organizations which find their name in the list of best companies for employees for 2014 would remain as such in the future too. They may change for better or worse in the future. And that all depend on the attitudes of the top management and the rest of the key authorities in their respective organizations who are responsible for making the people work earnestly, taking pride in their organization.
If corporate history is any indication, there would be many companies that would compete in the future to find their names in the list that I mentioned above. That is a matter of prestige and some top corporate managers are too willing to do any short cuts for gaining such prestigious positions without honestly making any real cultural change within their organizations.
That is true with all management systems, be it of total quality management (TQM), corporate social responsibility (CSR), Environment Management, Safety, etc., etc.
In short, every thing ultimately boils down to people. If the organization is made of people having the 4 C's that I wrote some time ago, things would naturally follow a better path and the company would naturally be a great place to work. The more such people in the organization, the more it would be a better place to work!
But there is a critical mass in this case too. When the numbers of the 4 C-people go down below a certain limit, the company or organization begins to collapse as it would not be easy for the company to make any positive changes by its own.
It would be an interesting study if any one ventures to study why only 2 PSU's were liked by their own employees! Of course, such studies and their findings would be of any use only when there is some one to examine those for positive actions!