Chevrolet Volt 2013 Owner's Manual page 134

5-28 Instruments and Controls
Battery Power Vehicle is stationary
in electric mode and no power is
flowing to the wheels.
Engine Power Engine is active
with energy flowing to the wheels.
Engine Power Vehicle is stationary
in extended range mode and no
power is flowing to the wheels.
Engine and Battery Power Both
the engine and battery are active
with energy flowing to the wheels.
Regen Power Recovery Power
from the wheels returns to the
battery during regenerative braking
or coasting.
Power Off No power is flowing to
the wheels.