Monitoring / analyzing power usage of very large (75 HP) electric motors

[sanddrag]

I am trying to research devices that would be able to monitor, log, and analyze (by graph or something of the sort) power consumption of large (up to 75 HP) "booster" pumps, but I haven't come up with anything so far. Hopefully some of the electrical engineers in here can point me in the right direction. I really don't know much of anything about how this would be done. I'm hoping to find something more fancy than a typical electric meter you'd find on the side of a building. This would be for a permanent installation application. A digital device with something like USB to download data or even network capability to provide real-time monitoring would be optimal, however I am unaware if such a thing even exists, much less where to find it or how it would work. Any help is appreciated.