Look at the command pmset, set your preferences and do a before and after snapshot with composer it will show you exactly where and what plist are affected
bash-3.2# pmset
Usage: pmset [-b | -c | -u | -a] <action> <minutes> [<action> <minutes>...]
pmset -g [disk | cap | live | sched | ups | batt]
-c adjust settings used while connected to a charger
-b adjust settings used when running off a battery
-u adjust settings used while running off a UPS
-a (default) adjust settings for both
<action> is one of: displaysleep, sleep, disksleep (minutes argument)
or: reduce, dps, womp, ring, autorestart, powerbutton, halfdim,
lidwake, acwake, lessbright (with a 1 or 0 argument)
or for UPS only: haltlevel (with a percentage argument)
haltafter, haltremain (with a minutes argument)
or: hibernatefile <path> hibernatemode <integer>
hibernatefreeratio <integer percent>
hibernatefreetime <integer ms>
eg. pmset -c dim 5 sleep 15 spindown 10 autorestart 1 womp 1
pmset schedule [cancel] <type> <date/time> [owner]
pmset repeat cancel
pmset repeat <type> <days of week> <time>
<type> is one of: sleep, wake, poweron, shutdown, wakeorpoweron
<date/time> is in "MM/dd/yy HH:mm:ss" format
<time> is in "HH:mm:ss" format
<days of week> is a subset of MTWRFSU
[owner] optionally describes the event creator
