Shift supervisor reported power pole at the K11 substation was on fire from electrical arcing, presumed to be due to the accumulation of snow. 12:51 shift electrician cut power to substation. Once the arching subsided flames went out but pole continued to smolder past 30 minute time frame. Smoldering extinguished at 2:05. At approx. 1:10 MSHA was notified.