It would seem that if all Banks do is take on some project risk (for a large fee?) and use public money to fund projects of definable public benefit - then their whole role in the whole  process is so small as to be largely dispensable.  

A large Utility like EDF, or a Government agency charged with promoting wind power would be just as capable of taking on project risk - seeing the state is proving the funding in any case - so why not just cut out the banks who are acting as little more than (a poorly funded) insurance company in this case.

Unless you are arguing that Banks have some specialist consultancy expertise in project evaluation that no one else has or can develop, what use is a bank as a bank if it doesn't provide capital?

notes from no w here