This document presents information about solid fuels used for power plant engineering. It discusses the introduction, types, characteristics and formation of solid fuels such as wood, coal, peat and manufactured fuels like charcoal and coke. The key points covered include the classification of solid fuels into natural and manufactured types. It also describes the constituents, calorific value and analysis of common solid fuels. Both advantages like easy transport and disadvantages like high ash content of solid fuels are highlighted.