The lights go out in Washington as the Nats’ first home game after the All-Star break is interrupted with the Dodgers leading, 2 – 1, in the 4th inning when a bank of lights on the third base side of the field at Nationals Park go out. Stadium personnel manage to turn them back on after a one hour, 22 minute delay, play resumes for 9 minutes, and the lights go out again. This time, 40 minutes are needed to restore power, but it lasts just 12 minutes. The game is finally suspended at 10:42 pm in the 5th inning, the Nationals having in the meantime taken the lead on a two-run homer by Danny Espinosa during the second brief resumption of play.

On July 17, 2015 The lights go out in Washington as the Nats’ first home game after the All-Star break is interrupted with the Dodgers leading, 2 – 1, in the 4th inning when a bank of lights on the third base side of the field at Nationals Park go out. Stadium personnel manage to turn them back on after a one hour, 22 minute delay, play resumes for 9 minutes, and the lights go out again. This time, 40 minutes are needed to restore power, but it lasts just 12 minutes. The game is finally suspended at 10:42 pm in the 5th inning, the Nationals having in the meantime taken the lead on a two-run homer by Danny Espinosa during the second brief resumption of play.

Source
Baseball Reference July 17