A comparison of the non-fuel variable operation and maintenance (O & M) costs distribution for one year operation of the water desalination side are shown in Fig. 45.7. The potential cost savings (i. e. actual—reference) are also shown in Fig. 45.7. Figure 45.7 does not include fixed operation and maintenance costs. The potential savings represent the potential improvements in operating efficiencies by
Fig. 45.8 Comparison and distribution of variable operation and maintenance costs for power production
continuously positioning operational practice towards best practice. The total potential savings in variable costs for 1 year operation amounts to $ 1,002,291/year.
A comparison of the variable operation and maintenance costs distribution for 1 year operation of the power generation side are shown in Fig. 45.8.
The statistics for fuel utilization has shown that the case study plant has an annual potential fuel saving of 93 mmSCF on the water delination side and 5596 mmSCF on the power generation side thus amounting to a total of 5689 mmSCF fuel savings. For a 10 year period, these savings amount to a total of 56,890 mmSCF. The data analyses for operation and maintenance costs presented in this section have examined a cogeneration power and water production plant in a bid to explore whether there is potential for improving operating efficiencies and thus reducing production costs. By setting reference performances and comparing them with actual plant operating data, the analysis shows that the generating company has an annual potential cost savings of $ 1,002,291 on the water desalination side and $ 4,456,113 on the power generation side, thus amounting to a total of $ 5,458,404. In 10 years these savings could accumulate to a total of $ 54,584,040. These calculations include only variable operation and maintenance costs (non-fuel costs) that can be gained by improving operating efficiencies of installed capacity.