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Promoting Geothermal Energy

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Promoting Geothermal Energy ( promoting-geothermal-energy )

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a surface vessel, called a steam separator. The steam is delivered to the turbine, and the turbine powers a generator. The liquid is injected back into the reservoir. Dry-Steam Power Plant In a geothermal dry-steam power plant, steam is withdrawn directly from an underground geothermal reservoir and used to run the turbines that power the generator. Because there is no water, the steam separator used in a flash plant is not necessary. These plants composed about half of U.S. installed capacity in 2012 and are all located in California.7 Binary Power Plant Binary geothermal plants have made it possible to produce electricity from resources lower than 150°C. These new plants have greatly expanded the U.S. industry’s geographical footprint, especially in the last decade. In binary systems, geothermal water is passed through a heat exchanger in order to heat another liquid called a working fluid, which boils at a lower temperature than water. When the working fluid vaporizes, the force of the expanding vapor turns the turbines to power the generators. The geothermal water is then injected back into the reservoir in a closed loop system that is separated from groundwater sources. Because binary plants use closed-loop systems, these plants boast near-zero GHG emissions. However, some particulate matter (PM) is emitted from the cooling systems of these power plants. Recently, most new plants that have come online in the U.S. have been binary systems.8 Enhanced Geothermal Systems Enhanced geothermal systems (EGS) refer to the engineering of conditions at a site to create a reservoir which then has the potential to produce geothermal energy. A geothermal system requires heat, permeability, and water, so EGS techniques make up for reservoir deficiencies in any of these areas. EGS technologies enhance existing fracture networks in rock, introduce water or another working fluid, or otherwise build on a geothermal reservoir that would be difficult or impossible to derive energy from using only conventional technologies. Distributed Generation, Small Power, Co-Production Traditional geothermal power can be used in small community-based power systems, such as the campus at Oregon Institute of Technology or the community system envisioned for Canby, California. Additionally, geothermal water is a natural byproduct of oilfield production processes. Much of the 25 billion barrels of water produced at oil wells each year in the U.S., long considered unusable “wastewater,” is hot enough to produce electricity through geothermal co-production. Many oil or gas wells could have clean energy capacities of up to 1 MW. A 1 MW power generator is small in conventional power generation terms, but the potential for hundreds of these to be brought on line within a short period of time is promising.9 It appears likely that most small power and EGS systems will utilize binary power cycles or a similar advanced power system technology. Capacity Factor The capacity factor of a power plant is the ratio of its actual output over a period of time to its potential output if it were possible for it to operate continuously at full capacity. Figure 2 provides national 7 GEA 8 Ibid. 9 Ibid. 6

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