Google - I wish to know how much torque is required to rotate 1 mw electrical generator at 960 rpm?

You need to study physics and learn the words. 1 mw is a trivial amount.

A device turning 3000 RPM turns 50 revolutions per second. If you have a single coil, called a two pole generator, it generates 50 Hz. An alternator might have much more than two poles and would generate proportionately higher frequency.

A device turning 960 RPM turns 16 revolutions per second. An alternator with six poles would generate three times that, or 48 Hz. You take it from there.

If you actually meant one milliwatt, the best approach would be to build a transistor oscillator. If you meant 1 MW, one megawatt, you need to hire somebody who knows what he is doing.