No, there is no opening available in NTPC Limited (formerly known as National Thermal Power Corporation Limited) for the post of Assistant Engineer right now. Salary for the post is also announced at the time of announcement of recruitment.
To apply for the post in future follow the below given steps:

Visit the official website of NTPC Limited
Click to “Careers” on the top of the home age
Click to “Jobs at NTPC”
On the new page, you will get the job details
That page will look like this: