According to most sources, the 2005 Epact has been extended until 2013
as part of the recent financial bail-out measures. I have a few
questions in that regard:

1) Will ASHRAE 90.1-2001 remain the standard, or will it be
upgraded to a later version with the extension?

2) Is 50% energy savings over a 90.1 building a plateau or are the
incentives pro-rated with savings under 50%?

3) Does the tax credit require full system modeling for any
improvements even though those improvements may only involve lighting or
heating?

4) Does 90.1 remain the baseline even in retro-fit applications for
this credit? (versus LEED that allows the base line to reflect the
actual building)?