For any interested in this topic:

Here is an email I received today from GBCI.

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Thank you for contacting the Green Building Certification Institute.

USGBC is currently working on an updated District Thermal Energy Guide
for the 2009 rating systems. However, they do not have an estimated
release date at this time. Project teams should continue to refer to
the old guide until the new guide is released. Please check the USGBC
website for any future updates regarding the release of this guide.

I hope this helps!

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Martin Snarski LEED(r) AP