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Middletown, CA, United States

Calpine Corporation is a Fortune 500 power company founded in 1984 in San Jose, California.Calpine's headquarters were permanently moved from San Jose to Houston, Texas in 2009. The company's stock was traded on the New York Stock Exchange under the symbol CPN until it was delisted on December 5, 2005 due to low share price. On 1/31/08, Calpine emerged from bankruptcy and again trades on the NYSE under the ticker symbol CPN. The company is headquartered in the Calpine Center in Downtown Houston. Wikipedia.


Rawal C.,Texas A&M University | Rawal C.,Calpine Corporation | Ghassemi A.,University of Oklahoma
Geothermics | Year: 2014

Coupled thermo-poro-chemo-mechanical processes in geothermal systems impact the reservoir response during injection and production procedures by affecting fracture permeability. A three-dimensional numerical model is presented to analyze these processes during fluid injection into geothermal reservoirs. The solid mechanics aspect of the problem is computed using the displacement discontinuity boundary element method (BEM) while transport processes within the facture are modeled using the finite element method (FEM). The FEM and BEM formulations are integrated to set up a system of equations for unknown temperature, pressure, concentration, and fracture aperture. The fluid diffusion, heat conduction and solute diffusion in the reservoir are treated using BEM so that the need of infinite reservoir domain discretization is eliminated. The numerical model is used to analyze the fracture response to non-isothermal reactive flow in EGS. Numerical examples of SiO2 undersaturated-cold water injection into the geothermal reservoir show that silica dissolves from the rock matrix, increasing the fracture aperture. The zone of silica dissolution spreads into the fracture with continuous fluid injection. At large injection times, thermoelastic stress has a greater impact on fracture aperture compared to poroelastic stress. Simulations that consider natural fracture stiffness heterogeneity show the development of a non-uniform flow path within the crack, with lower rock matrix cooling and thus enhanced silica reactivity in the high stiffness regions. As a result, areas of higher joint normal stiffness show lower aperture increases in response to the thermo-poroelastic processes, but a higher aperture expansion due to silica dissolution. Depending on the injectate saturation state with respect to quartz, silica is added or removed from the rock matrix. This process is likely to impact the rock matrix properties and its mechanical response to stress perturbations associated with fluid circulation. © 2013 Elsevier Ltd. Source


Patent
Calpine Corporation | Date: 2011-01-14

A system and method for removing contaminants from a gas stream is provided. The method can include the steps of reacting the gas stream with ozone to form solid contaminant particles and separating the solid contaminant particles from the gas stream. The solid contaminant particles can be separated from the gas stream using an adsorption material.


Farison J.,Calpine Corporation
Transactions - Geothermal Resources Council | Year: 2010

Water usage in geothermal power plants is often misreported. The amounts and types of water used for geothermal power plants varies widely with the type of resource, the power plant technology and the type of waste heat rejection system. Today's geothermal power plants do not use once-through cooling. Geothermal dry steam and flash plants create their own cooling water from steam condensate and mechanical draft cooling towers are typically used for waste heat rejection. Lower temperature geothermal resources typically use air cooled condensers or hybrid wet/dry cooling. Geothermal typically has minimal impact on fresh water or groundwater sources. Geothermal fluids are distinctly different from fresh water sources and must be kept separate and returned to the reservoir. Geothermal can make use of low quality waters for reservoir recharge. The Geysers use of municipal reclaimed water from Lake County and Santa Rosa for reservoir recharge is a major success story. Reservoir recharge at The Geysers with reclaimed water now averages about 77% mass replacement on an annual average basis and helps to sustain steam production and generation. Strategic water injection across the Geysers field has become another important tool for reducing gas content in steam and helps reduce abatement system operating costs. Source


Patent
Calpine Corporation | Date: 2012-10-30

A system and method for removing contaminants from a gas stream is provided. The method can include the steps of reacting the gas stream with ozone to form solid contaminant particles and separating the solid contaminant particles from the gas stream. The solid contaminant particles can he separated from the gas stream using an adsorption material.


Lay E.,Calpine Corporation | Branlat M.,361 Interactive, LLC | Woods Z.,Calpine Corporation
Reliability Engineering and System Safety | Year: 2015

Resilience Engineering (RE) is a reframed perspective. This begs the question, "How to operationalize a shift in perspective?" We share strategies, tactics, experiences, and observations from implementing Resilience Engineering in power generation equipment maintenance. Use of Resilience Engineering principles shifts focus to the future, to systems, and to how people really work (not the idealized version of work). We more effectively shape outcomes as we pay attention to what's coming, looking for signs we're outside normal work or running out of margins that enable us to adapt and respond. Use of these principles opens new possibilities grounded in theoretical fields of biology, cognitive and system sciences (understand Cartesian views of the world work well for machines but not for people) and underlain by core principles (e.g., people fundamentally want to do a good job, actions taken make sense at the time, and system factors are tremendously influential on outcomes). This paper presents a practitioner's account of a Resilience Engineering approach in the context of power plant maintenance. The paper will describe how the introduction of RE principles was made possible through supporting/fostering shifts in perspective and gaining buy-in at various levels of the organization. © 2015 Elsevier Ltd. Source

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