https://en.wikipedia.org/wiki/Rural_Electrification_Act
Thomas Edison's first power plant, the Pearl Street Power Station (1882) powered just 82 customers initially, largely commercial and industrial users.
Large-scale electrification within the US was developed through public works including the Tenessee Valley Authority, Bonneville Power Administration, Hoover Dam, and numerous others. Four federal regional power administrations, the BPA, Southeastern, Southwestern, and Western Area Power Administrations, still exist.
Many rural regions are served by electric (and telephone) cooperatives:
https://en.wikipedia.org/wiki/List_of_utility_cooperatives#U...
Insull was put out of business by New York bankers who wanted to take over his business.
http://blog.heartland.org/2013/07/samuel-insull-getting-the-...
FDR needed enemies to blame to get his New Deal, and he had Insull hounded in the courts. Insull was found not guilty of any wrongdoing, but died penniless.
If you want to know history, you have to find better sources than wikipedia. There are plenty of books about this great man and this interesting period of history.
https://www.masterresource.org/insull-samuel/insull-rural-el...
FDR didn't like competition for attention, and hounded Insull in court for years.