In point of fact there are approximately 2,000 publicly owned utilities and 900 cooperatives.

That being said they generate only 15% of the power consumed in the US and their nameplate capacity is about 16%.  In reality most merely redistribute power produced by investor owned utilities and non-utility generators.

Niche entities incapable of benefiting  from the economies of scale and serving as a haven for local bureaucrats and their miscellaneous clerks.