Figure XI-2.- SPS cost parametrics. currently receives significant research and development funding; however, major technological breakthroughs are still required before total system definition may be accomplished. The range of power-generation costs for the advanced systems is 28 to 55 mil Is/kWh for the ocean thermal system to 97 to 121 mi Ils/kWh for ground-based solar thermal systems. The solar thermal systems could not be strictly classified as a baseload system because only limited (shortterm) energy storage is provided. The wind power-generation system cost is based on the "fuel saver" operational mode wherein the wind system operates in parallel with conventional plants when windspeeds are within a specified range, thus effecting a reduction of fuel consumption in the conventional plants. In this mode of operation, the wind plant annual capacity factor, which is a measure of equipment utilization, is very low (30 to 40 percent at best).
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