Billy and Maria Saving Energy is a 24-page storybook targeted to children ages 4 to 7. Two young children, Billy and Maria, learn how to use energy safely and how to save energy in their home. They talk with their parents and visit their places of work. By the book’s end, they’ve heard new ideas and come up with some of their own. Emphasizing safe, easy-to-follow tips, it includes coloring, “find the light bulb,” and “what’s wrong with this picture” activities.