ELECTRIC
Seems like the the Smallest of mixers are Electrical Powered and so are some of the largest ones at the Batch Plant Level. Most of the Medium and Large units are Gasoline or Diesel.
Quiet Operation: Ideal for residential or noise-sensitive areas, or Indoors.
Zero Emissions
Low Maintenance
Fewer Parts and no Fuel System.
Disadvantages.
Small Units are Plugged into Extension Cords, and by nature of the work they create a Wet Location - May Trip GFCI.
Less Powerful than Gasoline or Diesel: Generally suited for lighter workloads.