Anathema
Crotchety Olde Man
Who built, maintains, and makes improvements on the power grid?
The individual PRIVATE COMPANIES that own, build, and maintain the electric grid. I happen to work for one of the largest ones in the country. We are regulated by the Feds and the individual States we do business in.
Certain, individual communities have chosen to maintain their grids as public utilities (similar to water and sewer systems). These tend to be more rural areas.