The number of attacks with gunfire or vandalism on the U.S. power grid infrastructure surged last year and is likely to continue rising this year, too, a confidential analysis seen by The Wall Street Journal has shown. Last year, the number of physical attacks – including intrusion, vandalism, and gunfire – jumped by 71% from 2021, according to the Electricity Information Sharing and Analysis Center, or E-ISAC, a division of North American Electric Reliability Corporation (NERC). The number of attacks on power grid infrastructure soared…