Average modem power consumption in watts?

Thank you for your help. But if the signal from the satellite is amplified in the modem and the signal sent to the satellite is powered by the modem, then I would guess that when a signal is neither being sent or received there may be only a few watts being used by the modem. Is this true? If not, how is the extra power being used during idle times. Curtis-m below says he uses 9 watts most of the time on his HN 9000.