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4. Economic Comparison An economic comparison was made between the presented reference cases in this study. To make the comparison fair the same annual operation hours, fuel price, interest rate and economic lifetime was used in the calculation of the COE for the different plants. As a first comparison, typical Swedish conditions were assumed: • Fuel price: 15 €/MWh • Economic lifetime: 15 years1 • Interest rate: 6% • Annual operation hours: 5000h The COE was calculated for every reference case, this is illustrated by the dots in Figure 4.1, curve-fits were also made to generalize each technology. The sale price of electricity was assumed to be 34.5 €/MWhel (mean value 2004-2007 in Sweden, see Appendix E) along with a green electricity certificates value of 26.1 €/MWhel. This is illustrated by the two dotted- lines in Figure 4.1. If any of technologies has a COE below the dotted-line at approximately 60 €/MWhel it can be considered economically viable regarding the electricity production. However, it can be seen in Figure 4.1 that no of the considered CHP technologies in this study are economically viable under the conditions assumed. Still it can be seen that for the larger plants based on either EFGT or gas engine technology the electricity price or green electricity certificate just need to be increased with 10-15 €/MWhel before each of these technologies are profitable. Furthermore when considering plants in the power range below 1000 kWel the increase needs to be at least 35 €/MWhel or more. When consider the real values instead of the curve-fit it can be seen that the Movisala plant is close to being profitable it only requires a increase of 8 €/MWhel on electricity price or certificates value before becoming economically viable. Although it should be noticed that the Movisala plant has not commissioned yet and that it also has a scale advantage compared to the other technologies. 1 15 years was chosen since this is the maximum numbers of years that a plant can receive green electricity certificates in Sweden 51PDF Image | Biomass Based Small Scale Combined Heat and Power Tech
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