Algae can be turned into biofuel -- but what's it cost?

Not very surprisingly, if you cook algae in a pressure cooker, you can turn the gook into something that burns in engines:


Pressure-cooked algae ‘make better biofuel’


If the process is energy-intensive (and it sure seems like it would be), then it's going to need a reliable and powerful energy source to make it work: sounds like nuclear to me. Otherwise, what's the point?