Natural Gas: Customers and Consuming Industry is the 3rd volume in a series of textbooks - following Natural Gas: Exploration and Properties (1st volume) as well as Natural Gas: Operations and Transport (2nd volume), which is going to be continued with Natural Gas: Economics and Environment (4th volume). The aim of this series is to provide a student with the basic technical and commercial tools required when following the flow of gas from the reservoir to the burner tip. Volume 3 is meant to accompany the reader along the flow of gas from the point of delivery to the burner tip and concludes with the physical flow of gas at the point of consumption. This volume consists of four chapters commencing with chapter 13, which deals with basic technical aspects of gas marketing, especially gas metering, storage and distribution. Chapter 14 provides a description of the various gas markets for residential, commercial and industrial customers (including a brief description of natural gas vehicles and fuel cell technology), while concluding with an introduction to natural gas trading and hedging instruments. Chapter 15 and 16 relate to the role of natural gas in two key gas-consuming industries in connection with power generation and the use of natural gas as a feedstock for the petrochemical industry.