This document provides an overview of a seminar report on diesel engine power plants. It describes the key systems of a diesel power plant, including the air intake system, fuel supply system, exhaust system, cooling system, lubricating system, and starting system. It notes that diesel power plants produce 2-50MW of power and are used as backup power sources. The document discusses the advantages of diesel power plants, such as their simple design, limited water needs, and ability to respond quickly to load changes, as well as the disadvantages, which include high costs and noise.