It's pretty simple really. You just have to take a few things as givens. First, clutch fans move an assfuckton of air; probably in the 4000cfm range at their peak load. Second, to get a quality electric setup costs real money. Even if you use Altima fans (which will flow enough), you need a minimum of 2x 40A relays, 10ga wire, and a controller to do it right. Third, theres a lot of power involved. Those Derale, a Taurus fan on high, twin Altimas on high, they all pull over 50A while flowing similar cfm to a clutch fan. That's a lot of load on an alternator that only can generate 70A of current. Plus, your relays/wires need to be overrated as the surge current from switching a motor load can be double the normal current. Yeah, you can control when the e-fans are on, and hence when they're drawing power. But, nothing is free, and that power is getting used.

Short version: yeah, you can do electrics right, but you have to know what you're doing. And to do it right and cheap requires some real knowledge.