Dec. 11 (Bloomberg) -- Royal Dutch Shell Plc, Europe's largest oil company, and HR Biopetroleum will build an algae- growing plant in Hawaii to produce vegetable oil for biofuels
...
Algae ``can double their mass several times a day and produce at least 15 times more oil per hectare than alternatives such as rape, palm soya or jatropha,'' Shell said. It ``can be cultivated in ponds of seawater, minimizing the use of fertile land and fresh water.''
Shell, based in The Hague, plans to expand the 2.5-hectare (269,000 square foot) pilot project to a 1,000-hectare facility after two years and later to a ``full-scale commercial,'' 20,000- hectare plant, Sweeney said on a conference call with reporters. He declined to comment on planned investment.
...
The seaweed is expected to produce 60 tons of oil per hectare, a ``conservative figure,'' according to Sweeney. That compares with an average of 4 tons of oil per hectare for jatropha.