Well the 2003 Northeast blackout was started by a power utility in Ohio, and took out most of the north-east USA and even Ontario -- making it an international outage.
The 2011 Southwest blackout was caused by a substation in Arizona, and took down power in large parts of California and Tijuana (another international one, fun).
There was apparently one in 2019 in Argentina, Paraguay, and Uruguay that was started by a transmission line in Argentina.
Not super common, but more common than you'd think, power grids are very interconnected and weird.
The 2011 Southwest blackout was caused by a substation in Arizona, and took down power in large parts of California and Tijuana (another international one, fun).
There was apparently one in 2019 in Argentina, Paraguay, and Uruguay that was started by a transmission line in Argentina.
Not super common, but more common than you'd think, power grids are very interconnected and weird.