If a project purchases more green power than it needed, could a separate project use the "unassigned" RECs purchased for that first project if the contract dates are before the year the second project will be occupied? For instance, if the REC dates for the first project are 2009 and 2010, and the second project won't be occupied until 2011, will those RECs count towards LEED? How does this work for universities or other large institutions that purchase enough kWh to ‘cover’ several individual buildings?

Thank you!