ADVANCE FOR USE TUESDAY, DEC. 22, 2015 AT 3:01 A.M. EST (0801 GMT) AND THEREAFTER; THIS STORY MAY NOT BE PUBLISHED, BROADCAST OR POSTED ONLINE BEFORE TUESDAY, DEC. 22, 2015 AT 3:01 A.M. EST (0801 GMT) - In this Nov. 12, 2015 photo, concrete poles carrying feeder lines, right, line the roadway with traditional wooden electrical poles at left, near the Stennis substation for Coast Electric, which has been built up to a higher elevation, in Kiln, Miss. Utilities across the country are struggling to balance customer costs with the need for improvements to counter the rising number of violent storms, floods and droughts threatening the U.S. power grid’s core infrastructure. (AP Photo/Gerald Herbert)