Funnily enough, POWER is one of the notable platforms NetBSD has basically no support for at all. NetBSD will run on 32 bit PowerPC Macs, but only those. No support for 64 bit kernels or userlands, and only the most bare bones support for early 32 bit OF power systems.

OpenBSD recently added support for the PowerNV/OpenPOWER platform, could probably use their locore to bootstrap a NetBSD system. Still wouldn't run on a PowerVM system like the E980 :)