The IRS recently issued Rev. Proc. 2013-24, which provides safe harbor definitions of units of property and major components that taxpayers may use in determining whether expenditures to maintain, replace, or improve steam or electric power generation property must be capitalized under Section 263(a). In addition, Rev. Proc. 2013-24 provides guidance on obtaining automatic consent to change to a method of accounting that uses all, or some, of the unit of property definitions.