A massive power failure that crippled life in Turkey for almost 10 hours on Tuesday highlights the threats facing electricity grids worldwide.

Turkey’s most extensive power failure in 15 years, which left people stranded in elevators and traffic snarled, wasn’t the result of a lack of electricity. The prime minister said all possible causes — including a cyber-attack — were being investigated.

While the source of the problem is still unknown, recent revelations that a 2008 oil pipeline explosion in Turkey was orchestrated via computer and the high-profile hacking last year on Sony Pictures Entertainment demonstrate the increasing ability to penetrate systems. For power grids, technology being added to make them more reliable and productive is also giving attackers an entry point into vital infrastructure.

“Every country, including the U.S., will be looking at it to see what the vulnerabilities were and learn some lessons about protection,” said Kit Konolige, a New York-based utility analyst for Bloomberg. “An electric grid is a complex system and it’s hard to ensure that it’s defended everywhere.”

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