This photo shows one reason that electrification was such a huge deal for rural areas. Refrigeration made it possible for farms to produce more (because it became possible to transport it further for sale), electric lighting permitted a shifted working day and improved educational opportunities for farm children who would otherwise still be reading by lamplight, and labor-saving electrical devices permitted the household to be run with fewer hours of work.
The Rural Electrification Administration, established under Roosevelt during the Depression, continued its work into the 1960s. In the 1970s it was estimated that 98% of all farms had access to electricity- up from around 3.2 percent fifty years earlier. In 1994, the REA was reorganized into the Rural Utilities Service, which continues to operate today to assist rural communities in getting access to utilities where private infrastructure investment is not likely to occur. http://www.rd.usda.gov/about-rd/agencies/rural-utilities-service