President Donald Trump said he's ordered two nuclear submarines to move in the "appropriate regions" in response to recent comments from Russia's Dmitry Medvedev.
This week, Russian forces seized control of the defunct Chernobyl nuclear power plant, the site of the 1986 nuclear disaster.
ERCOT's failures during the February winter storm are part of a call for an independent body to investigate the Texas power grid operator.
ERCOT officials had urged electricity conservation earlier this week as several power generators unexpectedly went offline as temperatures rose this week.
Ontario Power Generation later tweeted that the alert "was sent in error. There is no danger to the public or environment."
