Ingersoll Rand's new PowerSource mobile generators reduce noise levels, and many key models come in smaller packages than the units they replace. An exclusive feature of the voltage selector shuts down the generator if the operator attempts to switch voltage while it is running. Thirteen models of PowerSource mobile generators range from 10 to 456 kilowatts. All but the smallest model produce single- and three-phase output. Estimated list price range: $14,400 to $157,000.