It does use less power when it's not transmitting. To lower it further you can use the sleep pin.
XBee 802.15.4 (S1)Supply Voltage 2.8 - 3.4 VTransmit Current (typical) 45mA (@ 3.3 V)Idle / Receive Current (typical) 50mA (@ 3.3 V)Power-down Current < 10 ?AXBee ZB (S2)Supply Voltage 2.1 - 3.6Operating Current (Transmit, max output power) 40mA (@ 3.3 V, boost mode enabled) 35mA (@ 3.3 V, boost mode disabled)Operating Current (Receive) 40mA (@ 3.3 V, boost mode enabled) 38mA (@ 3.3 V, boost mode disabled)Idle Current (Receiver off) 15mAPower-down Current < 1 µA @ 25°C
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