it's actually both acoustic and electric. What Priest have been doing on this tour is doing the first half of the song acoustic and the second half electric. From the videos I've seen on YouTube, it actually works really well.
Brocas Helm/Hatchet/Exmortus/Midnight Chaser 11/22
High on Fire/Kvelertak 12/12
Exodus/Nails/Hellfire (???) 12/20
Neurosis/Bl'ast!/YOB (???) 12/29