Do your pedals have wrench flats, in addition to the allen-key fitting? If so, get the appropriate size open-end wrench, and add a length of pipe as a "cheater bar" to get more leverage. If you only have the hex connection, get the longest allen wrench you can find, and add a pipe to it. You can get much more torque that way than the electric drill can produce. And as Dave noted, make sure to turn the proper direction. Left pedal is reverse threaded.
How long have those pedals been on that bike without being removed? I once had to take off a pedal that was so stuck, that with a 24" cheater bar, I actually twisted the allen wrench. Sort of looks like art now.
I have had a two stuck pedals in the past. I've always been able to position the crank just right and the wrench just right, the I'll stomp the wrench with a blow from my foot. They have always broke free.
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