Aug. 11 is National Safe Digging Day, recognizing the importance of having underground utility lines marked prior to digging or excavating Duke Energy reported damage to underground electric and natural gas lines more than 5,000 times this year  Video here: Learn how the 811 process worksCINCINNATI, Aug. 11, 2025 /PRNewswire/ -- Aug. 11 is National Safe Digging Day (also known as 811 Day), and Duke Energy Ohio/Kentucky is advising customers and excavators to call 811 at least three business days before beg ...