Read Micheal Pollin's book you'll find what a dicey
crop they are!!

Depend upon farmers-- look what they all did with
their co-op investments in biodiesel plants... the business
model was to be profitable with $6 bushel soy beans..they
all went out and planted corn... there are abunch of farmer
owned biodiesel plants for that reason and of course a few
other minor ones, sitting around idle!

If you spend a little more effort in front of your computer
on the internet you'll find a few more likely solutions:
psud.pk Petrosun might be one of them!!