An agricultural baler includes a main bale chamber, and a plunger reciprocally movable within the main bale chamber through a compression stroke and a return stroke. The plunger has a duty cycle with a maximum power requirement, a minimum power requirement, and an average power requirement over the duty cycle. The baler further includes an auxiliary power system which is configured for transmitting power to the driveline to offset the duty cycle of the plunger and thereby establish a substantially constant power requirement at the driveline.
