Electricity in 1918. No electricity in 1930. How can that be?

My forthcoming novel is set in the year 1930. The main character lives on a farm in rural Georgia in the southeastern United States with no electricity. Nobody in rural Georgia has electricity in 1930 even though folks in Atlanta and other large Georgia cities have had electric power for years. In fact, Hannah Myers, the main character in my book “The Time Capsule,” lived in a couple of rooming houses in Atlanta in 1918 which both had electricity. So why did city folks have electricity back in 1...