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Results of the Hawaii SWAC Feasibility Analysis Dr, David Rezachek, Alternate Energy Specialist – State of Hawaii DBEDT, ERTD Dr. Rezachek summarized the findings of the SWAC Feasibility Analysis, which were published in the October 2002 Final Report. The full text of the report can be found at the website: http://www.hawaii.gov/dbedt/ert/swac.html. • Objectives of the Study o Identify potential areas for SWAC applications o Update previous feasibility studies o Conduct preliminary technical and economic feasibility analyses for other locations o Prioritize the locations for further analysis o Develop a Marketing Plan to allow private sector development o Identify types of assistance that can be provided by the State of other government sources • Areas Evaluated – 6 on Oahu and 4 on neighbor islands o Primary cooling demand areas on Oahu are not within practical reach of 1,000 m (3,300 ft) 4 oC (39 oF) water depth, but are within reach of 500 m (1,600 ft) 7 oC (45 oF) water depth. o Downtown Honolulu Waterfront, Kakaako, Waikiki are primary areas. o Other areas include UH-Manoa (with Waikiki), Pearl Harbor Naval Shipyard (PHNS), and Kaneohe Marine Corps Base Hawaii (KMCBH), as well as areas on Kauai. • Economic Analyses o Employed the EPRI Technical Assessment Guide (TAG) method of analysis o All SWAC assumptions were purposely chosen to be reasonable worst case conservative o Even so, Honolulu Waterfront, Kakaako, and Waikiki cases showed lower life cycle costs for SWAC (10 to 20% below costs for conventional cooling). o UHM-Waikiki, PHNS and KMCBH had somewhat higher life cycle costs for SWAC versus conventional cooling. o Sensitivity analyses were conducted to explore the impact on economic results. o Numerous alternate assumptions have the potential to individually reduce life cycle SWAC costs by approximately an additional 10%. Such factors include: capital cost contingency, interest rates, real escalation rates of electricity costs, income tax rates, Federal investment tax credits, depreciation rates, utility DSM incentives, Hawaii Energy Conservation Income Tax Credit, energy production incentives, and property taxes. o Potentially realistic combinations of these alternate assumptions could result in reductions in life cycle SWAC costs by more than 50%. Thus, even many non-primary sites may be economically practical for SWAC. 14PDF Image | Innovative Energy Systems Workshop
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