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EPRI Proprietary Licensed Material T&D SYSTEM ENERGY STORAGE SYSTEM APPLICATIONS Table 3-3. Summary of NAS Battery Application System Parameters Load Leveling Power Quality AGC Wind Base Alternate Base Alternate Base Alternate Base System NAS System Power, MW 10 10 26 40 2 PS Cycle Conversion Eff, % 76.7% NA 81.2% NA 76.7% PQ Cycle Conversion Eff, % NA ~70% ~70% NA Duty Cycle PS Duration, equivalent hr/cycle 8.6 NA 3 NA 8.6 PS Cycles, days/yr 167 NA 250 NA ~250 PQ Event Duration NA
EPRI Proprietary Licensed Material 4 COST/BENEFIT ANALYSIS 4.1 NAS Battery Pricing and Integrated System Costs In April 2002, NGK announced construction of expanded manufacturing facilities in Japan with an initial capacity commitment for 1000 modules per year in April 2003. Plans for future expansion include achieving 3600 modules per year in 2006 and 8000 by 2010. Nominal unit prices for utility scale applications of the NAS PQ and PS Modules addressed herein are: NAS 2003 2006 2010 Module Price, K$ Price, K$ Price, K$ PS $94.5 $75 $55 PQ $92.5 $75 $55 The NAS scope of supply for the prices indicated includes NAS battery modules, the battery management system, DC circuit breakers (PQ modules only), exterior enclosures, import duties and fees, shipment from Japan to an inland US site, plus technical support for system integration, installation and startup. For the purposes of this document, NAS prices for year 2006 are used for initial costs, and replacement costs are based on the 2010 mature prices. The cost of integrated systems is obtained by combining the cost of the NAS battery scope of supply with PCS and system interface equipment, plus balance of plant (BOP) scope. PCS and system interface equipment is assumed to include grid disconnect and breaker protection, transformers, controller(s) to synchronize one or more NAS system trains with the grid, and all equipment necessary for power conversion and isolation of the NAS battery system. Installed PCS and system interface equipment is valued at $230/kW for non-grid interactive systems and $280/kW for grid interactive systems. The BOP scope of supply consists of grid connection at the point of common coupling, land and improvements (e.g., access, services, etc.) and is valued at $20/kW. Cost components for the applications described in Section 3 are shown in Table 4-1. 4.2 Lifecycle Cost Analysis Further insight to the value of energy storage can be gained through lifecycle cost analyses using a net present value (NPV) methodology and comparison with alternatives. The financial parameters in Table 4-2 are used to assess the applications described in the preceding sections and, except for wind stabilization, the assumed electricity rate structure is presented in Table 4-3. The electricity rate structure used to characterize wind stabilization is presented in Section 4.2.4. 4-1
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