On June 22, 2015 HUD issued Notice 2015-04. The Notice outlines the Methodology for Completing Utility Analyses for Multifamily Housing.
This notice provides instruction to owners and management agents (O/As) for completing the utility analysis required at the time of the annual or special adjustment of contract rents and when a utility rate change results in a cumulative increase of 10 percent or more from the most recently approved utility allowance.
You can view a copy of the notice here.