An updated District Energy Systems (DES) guidance document has now been
posted on the USGBC website. It covers D&C programs for both LEED v2.x and
LEED 2009; see the introduction to the document for details on how to apply
it to each. Projects that were required to apply the earlier version of the
document to their project (v2.x projects registered after 05/28/2008) can
now opt to apply this version instead.

Many modelers may find this document easier to apply to their DES project
than the earlier LEED DES document (with similar results for the number of
points achieved).

You can find this document several places on the USGBC website including at:

http://www.usgbc.org/DisplayPage.aspx?CMSPageID=2061