No one I've seen does without at least battery backup/conditioning/etc. Some may have less than 100% redundancy on generators, but that's mainly because some of them are running with e.g. a 200MW grid feed and 20x10MW gensets and ALSO running about 10-15 of the "backup" gensets as prime power. It's possible corners are cut during commissioning (like they use modular structures during buildout of the tilt-up ISO 5 permanent structure), but substanially no one would do this as their long-term design goal.