“In Cities of Light and Heat Mark Rose has done for electric and gas systems what Sam Bass Warner did for streetcars. He demonstrates both that utility systems helped determine the character of developing cities and that the unique politics of each city determined the character of its utility system. Rose has tapped an uncommonly rich trove of archival sources from Denver and Kansas City to provide us with an uncommonly rich portrait of the men and women who shaped first the utility system, and then the profile of each city.”—Ruth S. Cowan, Author of More Work for Mother