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Chapter 5 Economic analysis Figure 5.13 shows the effects of increasing the thermal energy sale price at the three sale hours scenarios (with biomass cost fixed at 60 €/t): it is quite expectable to observe that PBTs decrease with increasing sale price, except for the 0 h scenario, for which this parameter is obviously irrelevant. However, the incidence is not enormous in absolute terms, the considered range being quite narrow (indeed, more external values would have been unreasonably high or low in terms of corresponding methane cost). On the other hand it is more interesting to note that the heat sale effect is not linear: the 2500 h curve is about half way between the 0 h and 7000 h ones (actually even closer to the latter than to the former), although it represents just about one third of the whole year period. This becomes even more clear in Figure 5.14, where the thermal energy sale price is fixed at 5 c€/kWhth, while biomass cost varies. The range of interest in this case is larger (biomass cost is influenced by several factors and can substantially vary from case to case), allowing a wider curve progress analysis. Apart from the obvious PBT increase with increasing biomass cost and diminishing heat sale hours, one can observe that the 2500 h curve is closer to the 7000 h one than to the 0 h one. Besides, the effect of increasing biomass cost is different in the three cases: it is very high without heat sale, while it gradually diminishes with increasing heat sale hours, until it becomes almost negligible in case thermal energy is being sold all over the year. The reason naturally lies in the heat sale itself: if it is performed, it allows to keep down PayBack Times. Finally, Figure 5.15 shows how PBT varies according to thermal energy sale price and biomass cost, considering a 2500 h heat sale scenario. In the previous lines it has been stated that such a heat sale period is sufficient to limit the variation effects of the other economic parameters: this figure confirms this assumption, since all curves are very close to each other. In conclusion, this sensitivity analysis has reasserted the relevance of heat sale as regards small-scale biomass power plant economy, showing in particular that selling thermal energy even for a not exceptionally high number of year hours (such as 2500 h) allows to limit the biomass cost raise effects. Consequences of varying thermal energy sale price are limited too, but this is also due to the fact that such values are quite standardised and may not be varied in a very wide range. 195PDF Image | SMALL-SCALE BIOMASS POWER GENERATION
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