A Manual for the Economic Evaluation of Energy Efficiency and Renewable Energy Technologies

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A Manual for the Economic Evaluation of Energy Efficiency and Renewable Energy Technologies ( a-manual-economic-evaluation-energy-efficiency-and-renewable )

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Discussion Analyses associated with the governmental sector, nonprofit organizations, or the owner-occupant residentialsector donotneedtoincludeincometaxesbecausethegovernmentandnonprofitorganizations do not pay income taxes and residential customers make-investments for the service those investments provide to them, not to generate taxable profits (unless financed with home mortgage or home equity funding). Normally,analysesassociatedwithoneoftheseaforementionedgroupswillincludelife-cycle cost, whereas private industry will be more concerned with the NPV of a particular investment. The formula for calculating TLCC is as follows: Where: TLCC = present value of the TLCC = cost in period n: investment costs include finance charges as appropriate; expected salvage value; nonfuel O&M and repair costs; replacement costs; and energy costs N = analysisperiod d = annualdiscountrate. As an example, in addition to the parameters assumed in the previous NPV example, assume that the investor is a nonprofit organization with an investment of $10,000; no salvage value; and O&M costs of $1,300 in year zero, inflating at an assumed inflation rate of 3% per year thereafter. Also assume the investment is not replaced, no income taxes, and a nominal discount rate of 12%. Table 4-5 illustrates this example. cn Year Investment $ 10,000 0 0 0 0 0 Discounted Investment $ 10,000 0 0 0 0 0 $ 10,000 I Current Dollar O&M Costs $ 0 1,339 1,379 1,421 1,463 1,507 Discounted O&M Costs (w/ 12% nominal) $ 0 1,196 1,100 1,011 930 855 $ 5,091 NPV Table4-5. CurrentDollarTLCCEvaluation The TLCC for the example in Table 4-5 is $15,091. As with NPV, this result is the same whether calculated using current or constant dollars, but the discount rate and cash flows will. be different. In year zero constant dollars, annual O&M costs are $1,300, which must be discounted at the real discount rate of 8.74% 43

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