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Pacific Gas & Electric Company (Advanced Underground Compressed Air Energy Storage)
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Lead Organization:
Pacific Gas & Electric Company
HQ Location:
San Francisco, California
Project Contact Information:
 Kimberly Nuhfer

77 Beale St.
San Francisco, CA 94177

Project Summary:

Pacific Gas and Electric Company’s (PG&E) advanced underground, compressed air energy storage (CAES) demonstration project is intended to validate the design, performance, and reliability of a CAES plant rated at approximately 300MW with up to 10 hours of storage. The CAES demonstration project is scoped to test the suitability of a porous rock formation as the storage reservoir in California, and demonstrate the technological improvements in the design of such plants. Porous rock formations are much more plentiful than the salt domes now used by the two operational plants in Alabama and Germany. If this geology is proven viable, this technology has the potential to be replicated throughout California and elsewhere in the United States. The project is also differentiated by its potential use of a new CAES plant design that is much more efficient than first generation Alabama and German designs. This project is comprised of three phases. Phase I includes site selection, reservoir testing, preliminary plant design, an environment assessment and a competitive solicitation to determine if there are interested and viable parties for plant construction, ownership and operations/maintenance. Phase I is estimated to last 4.5 years. Phase II, which includes obtaining approval to proceed with the construction and commissioning of a full CAES plant, has an estimated 6-year duration. Phase III includes operations & monitoring and is expected to occur over 2 years.


- HP/LP Expander Generator
- Air-Air Heat Exchanger/Recuperator
- Air Compressors
- Combustion Turbine

Targeted Benefits:

- Approximately 475 jobs created or retained during facility construction
- Approximately 25 permanent jobs created to operate the facility
- Greenhouse gas emissions reduced
- Grid reliability improved

Additional Information:

For more information about the project, please refer to:
- http://www.smartgrid.gov/project/pacific_gas_and_electric_company_advanc...

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