Out of the box, the Raspberry Pi is designed with power efficiency in mind. But there are a few things you can do to make it even more efficient, especially if you run in "headless mode" without the need of a monitor.
First, you can disable the HDMI port, which will save about 25mA. To do so, edit the file:
/etc/rc.local
To save even more, you can also turn off the bright red PWR LED and the ACT activity LED. If you want to disable both LEDs after every reboot, edit the following file:
and add the following:
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