I do industrial electrical work for a living. We have two large silica quarries we take care of. Its all 13.8Kv highline out to mobile buildings on skids with transformers that step it down to 480 volt 3 phase and from there we run all the crushers and belts. When they move stuff we just move the highline to accommodate and they drag the buildings around with a 988 Cat. The initial cost to get the highline down into the quarries would have been a lot, but now the moves where we add a few poles and a few thousand feet of line would quickly pay for themselves over diesel power in the 24/7 environment.