A utility is considering the addition of 500MW coal steam, 500MW combined-cycle, or 500MW gas turbines based on the reliability analysis. The characteristics of these units are shown in Table 1 (all costs in 1990 $). The escalation of coal is projected to be 5%/year. Natural gas is projected to escalate at 8%/year. The utility has a 10%/year discount rate and an 18%/year fixed charge rate. Compute the 20-year levelized owning costs ($/year) for these alternatives as a function of the unit capacity factor (a screening curve) and analyze the most economic alternative system depending on the change of capacity factor. A utility is considering the addition of 500MW coal steam, 500MW combined-cycle, or 500MW gas turbines based on the reliability analysis. The characteristics of these units are shown in Table 1 (all costs in 1990 $). The escalation of coal is projected to be 5%/year. Natural gas is projected to escalate at 8%/year. The utility has a 10%/year discount rate and an 18%/year fixed charge rate. Compute the 20-year levelized owning costs ($/year) for these alternatives as a function of the unit capacity factor (a screening curve) and analyze the most economic alternative system depending on the change of capacity factor