Jatropha also has low power per unit area

Jatropha is an oil-bearing crop that grows best in dry tropical regions (3001000 mm rain per year). It likes temperatures 20-28 °C. The projected yield in hot countries on good land is 1600 litres of biodiesel per hectare per year. That's a power per unit area of 0.18 W/m2. On wasteland, the yield is 583 litres per hectare per year. That's 0.065 W/m2.

If people decided to use 10% of Africa to generate 0.065W/m2, and shared this power between six billion people, what would we all get? 0.8 kWh/d/p. For comparison, world oil consumption is 80 million barrels per day, which, shared between six billion people, is 23 kWh/d/p. So even if all of Africa were covered with jatropha plantations, the power produced would be only one third of world oil consumption.

energy density (kWh/kg)

softwood

- air dried

4.4

- oven dried

5.5

hardwood

- air dried

3.75

- oven dried

5.0

white office paper

4.0

glossy paper

4.1

newspaper

4.9

cardboard

4.5

coal

8

straw

4.2

poultry litter

2.4

general indust'l waste

4.4

hospital waste

3.9

municipal solid waste

2.6

refuse-derived waste

5.1

tyres

8.9

Table D.3. Calorific value of wood and similar things. Sources: Yaros (1997); Ucuncu (1993), Digest of UK Energy Statistics 2005.

Table D.3. Calorific value of wood and similar things. Sources: Yaros (1997); Ucuncu (1993), Digest of UK Energy Statistics 2005.

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