On March 28, Assistant Treasury Secretary for Legislative Affairs Alastair Fitzpayne responded to a letter written by Sen. Michael Bennet (D-CO). The Bennet letter, which was sent on March 4 and was cosigned by 16 senators, urged Treasury to quickly complete guidance on what actions constitute “beginning construction” for purposes of the Section 45 renewable energy production tax credit (PTC) and the Section 48 energy investment tax credit (ITC). The American Taxpayer Relief Act of 2012 (ATRA) modified the two credits by having them apply to projects that have begun construction by the end of 2013, rather than those that have been placed in service by the end of the year. The Department and the IRS are currently working on guidance on the issue.