U.S. utilities worry about cyber cover after Ukraine grid attack

U.S. utilities are looking hard at their cyber vulnerabilities and whether they can get insurance to cover what could be a multi-billion dollar loss after hackers cut electric power to more than 80,000 Ukrainians last month. The Dec. 23 incident in Ukraine was the first cyber attack to cause a power outage, and is one of just a handful of incidents in which computer hacking has caused physical effects on infrastructure rather than the loss or theft of electronic data. A similar attack in the Uni