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Power charge fees The power generation will reduce the maximum power consumption of the plant during the year, and reduce both the yearly power charge fee and the high load power charge fee accordingly. The power charge fees with an power generated ORC is calculated as from the mean the two hours with highest measured power consumption, with an ORC integrated. The power charge fees with and without an ORC can then be compared and a cost reduction found. However, the ORC will generate maximum power during the winter, which is also the period with the highest plant power consumption. Because of this, the power charge fees will be reduced by approximately the mean of the power generation during the winter. Therefore, the reduction is estimated as Power charge cost reduction = mean(Pgen(Nov-Mar)) · (172 + 256) (3.12) Penalty charges During consumption above the power subscription limit of 700 kWel, an additional 100% is charged. If this occurs during the high load period, an additional 150% is charged. The effects of the ORC in terms of reducing these penalty costs are neglected in the analysis. Energy tax There is an energy tax in Sweden of levied on the consumption of electricity. It is only paid by the electricity consumer, and since implementing an ORC does not affect the total power consumption of the plant considerable, the tax will not influence the profitability of the project. The energy tax does therefore not need not be included in the analysis. Inflation and price escalation The electricity price is assumed to increase with inflation, 1:1. Therefore, inflation does not need to be considered when calculating the costs and benefits of the project. This is a modest estimation, since many believe the electricity price, an revenues therefrom, to increase at a faster rate than inflation in years to come. 3.6.2 Modeling costs The most important costs are the unit cost of the ORC, the installation cost (piping and electrical), the maintenance cost and the fuel cost. The unit costs depends on the power rating of the system and large systems are relatively cheaper, in terms of SEK/kW; it ranges from about 30 kSEK/kW for smaller systems in the range of 50-100 kWel down to about 10kSEK/kW for systems above 1000 kWel. To account for this when modeling ORC systems of different power ratings, the unit cost is modeled 49PDF Image | Analysis of Organic Rankine Cycles for a Boiler Station
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