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EPRI Proprietary Licensed Material Regenesys Electricity Storage Technology and the main building was being readied for cell-stacks and plumbing to be put in place at the Columbus Air Force Base site. See Figure 8. The alternative to installing the Regenesys plant would have been a $5 million upgrade to the TVA sub-station and the sub-transmission system for the CAFB. The converter for the CAFB energy storage plant is rated at 16.8MW or 19MVA, so that the plant can be simultaneously used to demonstrate multiple applications, including improved reliability of service, transmission support, provision of ancillary services, and energy arbitrage. The cost of the CAFB plant to TVA is said to be $25 million. Similar to the Little Barford Regenesys plant, the CAFB plant is also a demonstration project for which TVA has not attempted to provide an economic justification. Some of the cell-stacks for the Little Barford plant have been built, and these are being acceptance tested at the Aberthaw test facility. Manufacturing of the cell stacks for the TVA Regenesys plant will be initiated when those for the Little Barford project have been completed. Page 13
EPRI Proprietary Licensed Material Regenesys Electricity Storage Technology Figure 8 Exterior and Interior Views of Progress with Construction of Regenesys Energy Storage Plant at Columbus Air Force Base Site Commercialization Issues The initial target market for Regenesys plants is utility-side applications requiring 100MWh, 10MW capabilities or more. The applications for which such energy storage plants will be used are addressed in the next section of this chapter. The commercialization strategy being adopted by Innogy is, we understand, in the process of being changed, although the two demonstration plants imply an approach to commercialization that cannot be changed too dramatically. The biggest market and commercialization hurdles appear to be: • Being able to sustain the financial commitment of Innogy, and now RWE, through what will probably be a long period of time in which the technology and the manufacturing will have to be refined. • A relatively limited market, since there may not be a great number of potential customers with sites that are economically attractive. • A changing “utility” market place, in which the major players are struggling to adapt to deregulation and re-regulation. • An unknown role for distributed resources (DR), and an unaccepted place for energy storage in the DR marketplace, particularly in relation to renewable resources which are relatively expensive. Applications Introduction Innogy, as one of the major generating companies in the United Kingdom, started into the process of developing an electricity storage technology with the understanding that storage had intrinsic value to a generating utility. Innogy analysts also concluded (as others before have done) that two or probably more applications will have to be addressed at any given site to give an attractive benefit to cost ratio. The nature of the Regenesys technology, which involves storage of inexpensive active material in external tanks, makes combination of both long discharge time and short discharge time applications possible. In fact, Innogy have often claimed that the reason for selecting Regenesys was that more storage capacity could be added to Page 14
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