http://www.csmonitor.com/2006/0111/p01s03-sten.html

This design features the harvest of biodiesel from the algae that is used to soak up the CO2 from the coal combustion.

a further ptoduct after the biodiesel is natural gas, which can then be stored and burned instead of coal, or better yet run through a catalytic fuel cell to produce electricity directly.

Multi-fuel plants like this that store wind and solar power, in the form of natural gas, can cleanly buffer the times when wind and solar power does not keep pace with grid demand.  And the use of coal can gradually be phased out, but without idling the expensive turbines and generators, they can then burn mainly natural has from algae production.