One number electric bike fans should remember is 746. The number of watts in a HP.
So on the above website most motorbikes have a 1000W motor which is 1.3hp and the really super (sic) ones have 2000W which is 2.7hp.
To put this in perspective the old mopeds (yes needs pedals to be called a moped) were around 1.5hp.
If anyone lives near hills the electric ones don't have pedals to help up hills.