SECTION 1. PURPOSE

This notice publishes the reference price under § 45K(d)(2)(C) of the Internal Revenue Code for calendar year 2021. The credit period for the nonconventional source production credit under § 45K ended on December 31, 2013, for facilities producing coke or coke gas (other than from petroleum based products). However, the reference price continues to apply in determining the amount of the enhanced oil recovery credit under § 43, the marginal well production credit for qualified crude oil production under § 45I, and the applicable percentage under § 613A to be used in determining percentage depletion in the case of oil and natural gas produced from marginal properties.