Cobalt bue lightning like flashes near I -77 exit 9 at Princeton.Observed at least three powerful cobalt blue flashes of light behind a ridge between I-77 exit 9 and possible MM 11. The flashes were noiseless and moved from north to south.The light event was preceded with blinkng table lamps, cable TV pixelation, house cat scratching to get in quickly at the main entry, and deep blue flashes reflecting on the southwest wall of the dining room coming in through the north facing patio doors.After stepping out onto the rear deck I could see the last of two flashes and determined that they were not associated with the usual power company outages since the color was not typical, the flashes were noiseless, and were actually moving at a high rate of speed. I have been an electrical engineer for forty years and this event is not typical for a rural interstate that has no transmission lines around.