None of the things you list are former public utilities of any kind, much less the specific kind under discussion (California public utility districts providing electricity and similar services.) PacifiCorp is a private utility company like PGE, formed from the merger of other (then- troubled), also private, utilities in 1910, and the other things aren't even utilities.

Are there any germane examples of your “These formerly ‘public utilities’ are now often owned by PE or Berkshire Hathaway” claim or is it just a complete non-sequitur?