This chapter presents general information about the recent methods applied for geothermal systems. Geothermal engineering can be separated into two groups: research about the underground geothermal reservoir using geophysical and numerical methods and the use of a geothermal power plant as a technology to produce electricity from the underground hot waters. In this chapter, both aspects are presented. Twenty-four countries are currently generating electricity from geothermal resources and 78 countries are using geothermal energy for heating purposes. The total installed geothermal capacity worldwide is 10.7GWe. This chapter is divided into four parts: The first part, the introduction, discusses the current use of geothermal electricity and the trend of installed geothermal capacity in the world. It also explains the main concepts of geothermal engineering and presents the different types of hydrothermal systems. The second part describes geothermal engineering technology and its components. This part presents direct utilization, geothermal heat pumps, electric power generation and combined heat and power generation, the numerical modeling of geothermal systems, the current state of practice, recent advances, and emerging trends in geothermal reservoir simulation and hybrid-microgravity monitoring applications at geothermal field. The third part presents a case study of Húsavík Energy in Iceland. In the fourth part, the economic analysis is presented.
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