I second Golden Purifier and obviously the Fanaticism tapes, which are all great, but I wouldn't consider any of these as Power Electronics. Sarin Snow could be a good example, but rather "Deus Vult" than the titles mentioned in the original post, which are more dark ambient (and, in my opinion, more boring). Shift's "Creation & Space" is also quite ritualistic and, in some aspects, can be classified as power electronics (but it's rather industrial drone/ambient music for me). Another ritualistic extreme noise (also here, not exactly power electronics) with massive ritualistic elements is "Ritual Totemic Stone" from Sam Kinley's project Ba. Ku.. Really evil stuff. Maybe stuff like Dagda Mor? Even though this is more heathen/ariosophic/"solar", I discovered it (thanks to some suggestions on this forum) when I wanted to listen to more "spiritually pregnant" power electronics and it fitted my taste quite well.