This is a common tagging mistake for the Danish band Kraftwelt which has no formal connection to either Portishead or Kraftwerk http://www.allmusic.com/cg/amg.dll?P=amg&sql=Kraftwelt&opt1=1 PLEASE FIX YOUR TAGS.
http://www.allmusic.com/cg/amg.dll?P=amg&sql=Kraftwelt&opt1=1
PLEASE FIX YOUR TAGS.