It was the second widespread failure in less than a week, underscoring just how fragile Puerto Rico's electricity remains since the storm hit on September 20.
Puerto Rico, home to more than 3 million USA citizens, has grappled with widespread power outages for months since Hurricane Maria devastated the Caribbean island.
SAN JUAN, Puerto Rico (AP) - The mayor of San Juan says Wednesday's Cleveland-Minnesota game at Hiram Bithorn Stadium will be played as scheduled, despite an island-wide blackout that hit Puerto Rico. "We are always aware that something like this can happen", she said.
Lights at some San Juan hotels went out around 10 a.m., before generators kicked on and restored power.
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The U.S. territory's electric power authority said in a tweet that the outage is expected to last 24-36 hours for some customers. "Nothing will stop us".
The Cleveland Indians, a team that took first place in the AL Central with 102 wins last season, showed some charity on Monday as they tried to do their part to provide aid for Puerto Rico, an island still suffering from the effects of Hurricane Maria.
Puerto Rico's power authority faced widespread criticism late a year ago for signing a $300 million contract to restore power with Whitefish Energy Holdings, a small Montana-based firm with only two employees at the time.
Forty-seven Major League Baseball regular-season games were played in Puerto Rico prior to Tuesday's contest, but none had taken place since 2010.