Educational comparison of three major power plant types—thermal, geothermal, and biomass—showing energy conversion pathways from fuel or heat source to electrical grid output. Each plant type follows a common energy transformation sequence: fuel or heat input → steam generation → turbine mechanical rotation → alternator electricity production → transformer step-up → grid distribution. The diagram illustrates how thermal plants burn coal, gas, or oil; geothermal plants tap underground heat reservoirs; and biomass plants combust organic material, all converging on identical turbine-generator-transformer architectures. This side-by-side comparison helps students and engineers understand efficiency trade-offs, fuel sourcing, environmental impact, and operational complexity across renewable and conventional generation methods. Fork this diagram on Diagrams.so to customize fuel types, add efficiency percentages, or extend with nuclear or hydro plant variants for curriculum or technical documentation.