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The plastic fan assembly weighs 1190.3 grams 2.624 pounds); fan with clutch assembly weighs 2787.5 grams (6.145 pounds).

The fan clutch is temperature operated, and the torque to apply the clutch is controlled by a thermostat. At low temperatures, there is not much torque to the clutch, so not that much power is being drained. At high speeds, the fan is driven by the airflow forced through the radiator, not by having the fan spin.

Even if you remove the fan and clutch assembly to install an electric fan, the pulley still has to remain since it drives the water pump.

Two things to take into consideration before installing one of these electric fans.
One, these fans draw large current. The vehicle is not designed to handle this large draw with a 125 amp generator. If it was a basic H3, with no optional accessories, it might handle the drain; however, if you have loaded it up with the marker lights, front grill lights, Monsoon system, etc., you might just overtax the generator.
Also, if the PCM turns the generator on full, this also causes a drain on HP; very small, but a drain.
Two, this one is one that most won't think about, but it could happen. Your new electric cooling fan fails to turn on when required, the engine overheats, and you blow the head gasket (or worse). GM will not pay the warranty claim on the engine repair, and they shouldn't, since it would have been caused by your installation of an aftermarket cooling fan.
Just some things to think about.

As for me, I don't believe you will see a large increase in HP or fuel mileage, unless you did a lot of idling in rush hour traffic.