Potential yields of biofuels per ha p.a.

Extremely approximate guideline figures of potential yields of different forms of biofuel per hectare per annum.  N.B. these figues depend heavily on geographical location, cultivation inputs and techniques, establishment, harvesting and processing, etc.

 

Fuel 

Net CV Annual yield per ha  Energy per ha p.a.  
 MJ/kg  tonne/ha.a (odt/ha.a)  GJ/ha.a MWh/ha.a 
Wood
(forestry residues, SRW, thinnings, etc.)
@ 30% MC
13 2.9 (2 odt) 37 10.3
Wood
(SRC Willow)
@ 30% MC
 13  12.9 (9 odt)  167  46
 Miscanthus
@ 25% MC
 13  17.3 (13 odt)  225  63
 Wheat straw
@ 20% MC
 13.5  3.5 (2.8 odt)  47  13
 Biodiesel
(from rapeseed oil)
 37  1.1  41  11.3
 Bioethanol
(from sugar beet)
 27  4.4  119  33
 Bioethanol
(from wheat)
 27  2.3  62  17
 Biogas @60% CH4
(from cattle slurry)
 30  0.88  26  7.3
Biogas @60% CH4
(from sugar beet) 
 30  5.3  159  44

N.B. While some of these fuels may be harvested annually, some are harvested on a longer cycle. SRC Willow for example is typically harvested on a three year cycle. Consequently while all the numbers in this table refer to the annual yield, an individual harvest of SRC will be three times as much per hectare.