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Title: Integrating CO₂ storage with geothermal resources for dispatchable renewable electricity

We present an approach that uses the huge fluid and thermal storage capacity of the subsurface, together with geologic CO₂ storage, to harvest, store, and dispatch energy from subsurface (geothermal) and surface (solar, nuclear, fossil) thermal resources, as well as energy from electrical grids. Captured CO₂ is injected into saline aquifers to store pressure, generate artesian flow of brine, and provide an additional working fluid for efficient heat extraction and power conversion. Concentric rings of injection and production wells are used to create a hydraulic divide to store pressure, CO₂, and thermal energy. Such storage can take excess power from the grid and excess/waste thermal energy, and dispatch that energy when it is demanded, enabling increased penetration of variable renewables. Stored CO₂ functions as a cushion gas to provide enormous pressure-storage capacity and displaces large quantities of brine, which can be desalinated and/or treated for a variety of beneficial uses.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Univ. of Minnesota, Minneapolis, MN (United States); Department of Earth Sciences, Zurich (Switzerland). Geothermal Energy and Geofluids Group.
  4. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
OSTI Identifier:
1201669
Type:
Accepted Manuscript
Journal Name:
Energy Procedia
Additional Journal Information:
Journal Volume: 63; Journal Issue: C; Journal ID: ISSN 1876-6102
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 15 GEOTHERMAL ENERGY; 54 ENVIRONMENTAL SCIENCES geothermal energy; bulk energy storage; thermal energy storage; parasitic load; geologic CO₂ storage; CO₂ utilization; brine utilization