Look at the size of it though. This was not a building sized zap, it was on the horizon and the lighted area covered a mile or so. No transformer could have done that.
Maybe it was a very big transformer? Or, could it be linked to the solar disturbances that occurred last week? I can’t believe that some news source from that area hasn’t pinpointed what it was.
Don’t forget that this is essentially a night vision camera. An extremely bright localized source would generate a wide flare due to forward scattering through the air, and this does not indicate anything like a fireball of that size.