In the beginning, electricity was a luxury that only folks in cities could have but after the Great Depression produced an abundant labor force for the government to tap, huge water projects were erected throughout the country, making it possible to expand electricity to hard to reach areas.
Rural folks are too independent to just accept new things that would make them dependent on something else -- i.e., electricity. Kerosene lamps were fine. The only way to get these folks voluntarily online was to put them in charge of the utitlity by creating Rural Electric Co-ops -- members own the company.