Malta, NY, October 1, 2012 – The Building Performance Institute, Inc. (BPI) is proud to announce that BPI-2400-S-2012: Standard Practice for the Standardized Qualification of Whole-House Energy Savings Predictions by Calibration to Energy Use History, also known as the "Delta Standard," has been published as an American National Standards Institute (ANSI) standard.

The Delta Standard specifies a process for the calculation of standardized predicted savings: the difference (delta) between the modeled energy usage before and after an upgrade using approved building energy use simulation software. The process uses actual home energy bills to predict savings, and provides a set of standardized operating conditions to be used in the final calculation of predicted savings....