An informative read describing how waste from cows, dogs and even humans can be used to power our cities. A celebration of green energy! Plop! The Secrets of Poo Power is a book-banded reading book for developing readers, carefully levelled at Purple Book Band. llustrated throughout with beautiful photographs, this 578-word non-fiction book features a more demanding text with an extended vocabulary. It is suitable for ages 7 - 8. Plop! The Secrets of Poo Power is part of Ransom Reading Stars, a structured programme for children learning to read. The series has fifteen levels: four phonics levels and eleven book band levels (Pink through to Lime).