"powerd" process uses a lot of CPU

Oftentimes, after I wake my Mac from sleep, powerd (which is the power management daemon? Which in particular deals with sleeping the Mac and waking it?) uses high CPU, usually around 25% to 50% on my i7 CPU.

Anyone know how I can find out what's causing it, and what I can do to fix it? It seems to be a problem with waking from sleep but I don't know what.

This problem started happening after I updated my Mac Mini to 10.10.2, a few weeks ago.