Is there any way to noninvasively/invasively measure the current/voltage (Power) to get actual power consumed by load?
Generally speaking, non-contact power measurement is not possible. That is, you cannot make a device which will make no electrical connections to an isolated set of wires and determines the power being provided to the load.

Power (kVA) is the product of voltage and current. It is possible to make clamp-on current meters, which take advantage of the fact that AC current produces an AC magnetic field which can be sensed by, for instance, Hall effect sensors or a specially-constructed transformer. These are pretty standard devices, and come in a large range of scales.

Voltage, on the other hand, does not lend itself to non-contact measurement. 

With that said, one might (in theory) build an AC power system with a built-in load (such as a resistor of known resistance), and it would be possible to do a non-contact measurement of the current in the load and thereby back out the voltage. But I doubt that this is what you're thinking of.

However, all of the above is pretty much beside the point. As others have commented, 90 kVA is nothing for someone with no experience to even think about messing with. Your question suggests that this is not a homework exercise, but rather a business situation. Based on what you have asked, I suggest very strongly that you tell your boss that he needs to hire either an experienced engineer or a consultant with a proven track record. I'm sure you'd rather not plead inexperience to your boss, but in this case it is very much the best option. A commercial high-power installation is not a good laboratory for self-education.