Fox explained the outage, which occurred in the middle of the fourth inning, by saying its broadcast truck in Kansas City lost power.
"Before the start of the bottom of the fourth inning of tonight's World Series Game 1, a rare electronics failure caused both the primary and backup generators inside the Fox Sports production compound to lose power," Fox said in a statement. "The issue was immediately addressed, although it resulted in the audience missing one at-bat during the time needed to switch to carriage of Major League Baseball's international feed, powered by a different generator on site.
"The on-field delay was due to replay capability being lost in both teams' clubhouses. We apologize for the interruption in tonight's coverage and are working to ensure that the remainder of the World Series is broadcast without incident."
Google Fiber also issued an apology via Twitter, although it might have been unrelated to the issues behind Fox's outage.
The game was halted for seven minutes because there was no video for replay. Play resumed after Royals manager Ned Yost and Mets manager Terry Collins agreed to continue the game without replay.
Fox was able to air its primary feed again in the sixth inning and appeared to experience no further issues in the 14-inning marathon, the longest Game 1 in World Series history, which the Royals won 5-4.