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Geothermally Well Based Compressed Air Energy Storage

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Geothermally Well Based Compressed Air Energy Storage ( geothermally-well-based-compressed-air-energy-storage )

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Contents Summary ...................................................................................................................................................... iii Acronyms and Abbreviations .....................................................................................................................vii 1.0 Introduction .......................................................................................................................................... 1 1.1 Objectives..................................................................................................................................... 1 1.2 Background .................................................................................................................................. 1 1.3 Hybrid GT-CAES......................................................................................................................... 2 2.0 Site Discussion ..................................................................................................................................... 4 2.1 Site Selection................................................................................................................................ 4 2.1 Geologic Setting ........................................................................................................................... 8 2.2 Geysers Development History ..................................................................................................... 9 3.0 Utilizing Wells for Compressed Air Storage...................................................................................... 11 3.1 Capacity and Scalability of Well-Based CAES ......................................................................... 11 3.2 Existing Well Completions ........................................................................................................ 13 4.0 System Design and Unit Operations................................................................................................... 14 4.1 CAES Wellbore Design Basis.................................................................................................... 14 4.2 Air Compression and Wellfield Utilization................................................................................ 16 4.3 Compression Process Flow and Heat – Material Balance.......................................................... 18 5.0 GT-CAES Air Recovery and Power Generation ................................................................................ 20 5.1 Power Generation Process Flow and Heat – Material Balance .................................................. 20 5.2 Ancillary Equipment and Unit Processes ................................................................................... 23 6.0 Sensitivity Analysis ............................................................................................................................ 24 6.1 Plant Capacity and Energy ......................................................................................................... 24 6.2 Arbitrage Economics.................................................................................................................. 24 7.0 Project and Levelized Costs of Electricity.......................................................................................... 28 8.0 Discussion........................................................................................................................................... 30 9.0 References .......................................................................................................................................... 32 Figures Figure S.1. Geothermal-Coupled CAES Concept Using Existing Well Casing for Air Storage ................. iv Figure 1.1. Hybrid CAES Coupled Geothermal Power Production Facility ................................................ 3 Figure 2.1. Density of Productive Wells (per quarter-mile) Relative to Generalized Geothermal Resource Potential (°C at 4.5 km)......................................................................................................... 4 Figure 2.2. Existing Well Density and Areas of Known Geothermal Resources, Southern California .............................................................................................................................................. 5 Figure 2.3. Existing Well Density and Areas of Known Geothermal Resources, Northern California .............................................................................................................................................. 6 ix

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