| Autor: |
Timm Tennigkeit, Izael DaSilva, Axel Weinreich, Kai Windhorst, Thomas Buchholz |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Biomass and Bioenergy. 59:116-127 |
| ISSN: |
0961-9534 |
| DOI: |
10.1016/j.biombioe.2012.11.027 |
| Popis: |
Increasing electricity supply in Sub-Saharan Africa is a prerequisite to enable economic development and reduce poverty. Renewable sources such as wood-fueled power plants are being promoted for social, environmental and economic reasons. We analyzed an economic model of a vertically integrated system of short-rotation woody crops (SRWC) plantations coupled with a combined heat and power (CHP) plant under Sub-Saharan African conditions. We analyzed a 5 MW (electric) base-case scenario under Ugandan conditions with a 2870 ha Eucalyptus grandis plantation and a productivity of 12 t ha −1 y −1 (oven dry basis) under a 5-year rotation. Plant construction and maintenance constituted 27% and 41% of total costs, respectively. Plantation productivity, carbon credit sales as well as land, fuel, labor & transport costs played an economic minor role. Highly influential variables included plant efficiency & construction costs, plantation design (spacing and rotation length) and harvest technologies. We conclude that growing 12–24 t ha −1 y −1 at a five year rotation can produce IRR's of 16 and 19% over 30-years, respectively. Reducing rotation length significantly reduced short-term financial risk related to frontloaded costs and relatively late revenues from electricity sales. Long-term feed-in tariffs and availability of a heat market played a significant economic role. The base-case scenario's 30-year IRR dropped from 16% to 9% when a heat market was absent. Results suggest a leveling-off of economies-of-scale effects above 20 MW (electric) installations. Implementation-related research needs for pilot activities should focus on SRWC productivity and energy life cycle analysis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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