An episode of The Engines of Our Ingenuity explores the development of hydroelectric power. This episode, numbered 2641, focuses on Niagara Falls. The title mentions ghosts of Niagara, but details about this aspect are not provided.

Further information about the episode can be found through the source. The episode discusses the role of Niagara Falls in the development of hydroelectric power, highlighting its significance in this context.

The source provides more details about the episode, including its title and number, for those interested in learning more about the topic of hydroelectric power and its connection to Niagara Falls.