Values of Geothermal Energy October 2013

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Values of Geothermal Energy October 2013 ( values-geothermal-energy-october-2013 )

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The Values of Geothermal Energy October 2013 Baseload Power (Firm Power) is the minimum amount of power that a utility or distribution company must generate for its customers, or the amount of power required to meet minimum demands based on reasonable expectations of customer requirements. Baseload values typically vary from hour to hour in most commercial and industrial areas. Large baseload units also tend to have lower operating costs relative to other fossil-fueled facilities. Capacity Factor/Value 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 continuously operate at full nameplate capacity. To calculate the capacity factor, the total amount of energy produced by the power plant during a period of time is divided by the amount of energy the plant would have produced at full capacity. Capacity factors vary greatly depending on the type of fuel that is used and the design of the plant. The capacity factor should not be confused with the availability factor, capacity credit (firm capacity) or with efficiency. Contingency Spinning Reserve is generation (or responsive load) that is poised, ready to respond immediately, in case a generator or transmission line fails unexpectedly. Spinning reserve begins to respond immediately and must fully respond within 10-15 minutes. Enough contingency reserve (spinning and non-spinning) must be available to deal with the largest failure that is anticipated. Demand response is not a single technology or rate which a power plant can be activated. Rather, Demand Response is any technology that controls the rate of electricity consumption rather than the rate of generation. FERC defines the term Demand Response to include “consumer actions that can change any part of the load profile of a utility or region, not just the period of peak usage.” Dispatchable energy is closely related to load following and ramping. However, dispatchable energy focuses on the energy consumption at times of peak capacity requirements and minimum load while Load Following focuses on the rate of change in generation and consumption, i.e., the ramping requirements. Both can be obtained from sub-hourly and hourly energy markets and/or the movements of the marginal generators or loads. Distributed generation refers to electricity generated from many small energy sources. Most countries generate electricity in large centralized facilities powered by fossil fuels or hydropower. Distributed generation allows energy to be collected from many sources and may result in a lower environmental impact and improved security of supply. Dry Steam, Flash, and Binary are the three main types of geothermal power conversion technologies. In dry steam technology, steam is withdrawn directly from a subsurface geothermal reservoir and used to run the turbines that power the generator. In flash plants, high-pressure and high - temperature geothermal fluids separate (“flash”) into steam and water either in the reservoir, in the well, or in a surface separator as a result of pressure decrease. The steam is delivered to a turbine that powers a generator and the resulting liquid is injected back into the reservoir. In binary plants, geothermal fluid is prevented from flashing by maintaining the pressure and is used to heat a secondary liquid called a working fluid, which boils at a lower temperature than water. Heat exchangers are used to transfer the heat energy from the geothermal fluid to vaporize the working fluid. The vaporized working fluid, like steam in flash plants, turns the turbines that power the generators. The geothermal water is injected back into the reservoir. The binary configuration is a closed-loop system with zero emissions that maintains complete separation from groundwater sources. 5

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