nice topic.
all text below - simply some supervision and and attempt to allocate the main 'tendencies' (and my imho,for sure)
power electronics - several 'shools' or whatever:
"like Whitehouse" - screaming distorted vocal with special annoying noises. Simple "rhythm" and structure in tracks.
For example - WH tracks- mindphaser,pro-sexist,pissfun etc. Some Sutcliff Jugend and Ramleh staff. Main theme -perverts,maniacs and sexual violence.
'harsh power electronics' - this is a harsh noise (pedals,computer,feedback as source etc) but with vocal.
Kinda 'like Whitehouse',but sound (noise) more dense. without any 'rhythm' and 'structure'.
Slogun (let me show you how),Bizzare Uproar etc.
"like Dead Tech" - more structured and classic synth sound. Instead 'Whitehouse school' it has 'something' like 'melody','structure' and 'rhytm'.
More politically (not sexual) oriented. for example - Slave State,Dead Tech. probably Genocide Organ -In Konflikt
the main goal of this 'substyles' - aggression. Agressive sound. Hate and violence.
another subgenres is more "atmospheric" - "death industrial"/"post mortem"/"minimal pe"/'power ambient' etc.
the main goal of this sound - estrangement,"pressure" and 'fear forcing'.
MB - "Symphony for a Genocide". it has not pure agression as WH, but the atmosphere smothers and presses
Another 'tendencies' of 'death industrial' -
"Sound without human". Minimal rhythm pulses. For example - first part of Mauthausen Orchestra - 'Bloodyminded'.
'minimal pe' - recitative or distorted voice with only syntheizer. for example - DDV (A Sound Atlas Of Venereology),etat brut and some Atrax Morgue ('obsession' from closed exit) and many others.
and 'classic' death industrial - slow (!) looped waves of heavy synth - Lille Roger 'For Life' for example or another BDN staff
power ambient - survival unit (our lives in their hands),ex-order(the law of heresy). this is not so agressive,but atmosperic (sure,again).
and another specific pe/noise tendencies:
Galakthorro sound - special analogue pulses,beeps and wheeps (you know). Haus Arafna,Maska Genetic,Herz Juhning.
trance noise - looped waves of noise or samples. Noizeclot (beyond agony),observation clinique,reductio ad absurdum
power electronics - the main idea - agression,force and irritant
death industrial - main idea - 'atmosphere' forcing.
this is my imho and generally it concerns music 80x and began 90x years.
certainly, many early PE artists (LXSS,Deviation Social,RJF,Le Syndicat,MSR,Con-dom,Grim,TGW etc) consciously use 'various receptions' in the music so these designation are rather conditional.
therefore I can't tell that Grunt (for example) plays only 'harsh power electronics' or 'whitehouse pe'.
this is just a tendencies and my imho.