If they can’t get the power up in a reasonable time frame or it turns out not at all then YES an EMP attack.
Have heard from friends in Istanbul, and they seem to think is was a cyberattack. My daughter lived in Istanbul the last three years. They hardly ever lost power, but they lived in a new compound near the US Consulate.
By midafternoon Tuesday, Yildiz said 90% of Istanbul’s power had been restored.
http://www.cnn.com/2015/03/31/middleeast/turkey-power-outage/