A power outage in the southern United States has caused a blackout in the Mexican state of Baja California affecting more than 1 million people, officials said.

The director of the Baja California State Energy Commission, David Muñoz, said that in this state bordering on the U.S., a million users were left without electricity.

He said that power is being restored in some areas of the Mexican state and that priority is being given to hospitals and strategic industries.

The Federal Electricity Commission said in a communique that the power outage began at 5:45 p.m. Thursday due to operational problems at the U.S. utility, whose effects went from Arizona and California to the Baja California electric system.

Baja California, Muñoz said, is connected with the United States "because it is advantageous for both areas, since in the summer electricity is scarce in Baja California and in winter it has a surplus, a situation on which the binational electricity-supply agreement is based.