Have a look at FCOM 1.24.20 "warnings and cautions"
Here you will see that several electrical problem will give a warning in phase 5, i.e. the T.O. roll between 80 kts and liftoff.
In my standard T.O. briefing I always say that I do not intend to stop for electrical problems in the high speed regime. This includes the loss of both GENs!
Indeed, if during t.o. roll you see several screens momentarily go blank, don't go in the "engine failure mode" immediately. If you can't feel thrust loss continue the T.O. ! The captain will get his screens back in a few seconds time.
Next time you have some spare time in the sim, ask the instructor to throw you a dual gen failure at 100 kts and see what happens if you try to abort!
The chance hat you'll ever get such a strange failure in reality is very small, but it does make a nice sim scenario.
Anyway, I think it's best NOT to stop for electrical failures at high speed as you might indeed have serious braking problems!
Best regards,
Sabenaboy