On January 19, 2017, the Internal Revenue Service (IRS) issued Rev. Proc. 2017-19, 2016-6 I.R.B. (the Rev. Proc.), providing a safe harbor under which it will not challenge the tax treatment of an Energy Savings Performance Contract Energy Savings Agreement (ESPC ESA) as a service contract under Section 7701(e)(3). While the application of the guidance is limited to the ESPC ESA context, the Rev. Proc. nonetheless provides potential insight into the IRS’s views of other power purchase agreements for the purchase of renewable energy generally.