this property was under contract as of Nov 12, 2012 and had multiple offers. considering the size, there are most likely 2 units and would be located on the side of the house on the ground.
even if you call the Salt River Project or Southwest Gas who service this home, they will not give you or anyone except the owner the information on the average electric bill. you would ask the owner for that during your 10 day inspection time and should write in the contract if you're adament about getting that information.
All the best!