Empires of Light by Jill Jonnes

This is a history of DC vs. AC electrification. Edison vs. Westinghouse in a battle of the titans. It is very good and shows how an obviously superior technology can be suppressed for a time. Woven throughout is the exotic mysterious Tesla, genius, bon vivant, and dreamer. Edison is petty, Westinghouse is full of integrity and larger than life. The World's Fair and the Niagara project figure large in the story.