In no case shall the credit allocated for each such ton of coal among such electricity generators and such persons with an economic interest in coal exceed $3 per ton.
All credits earned on or after January 1, 2006, but before January 1, 2022, that are allocated to persons with an economic interest in coal as provided under this subsection may be used as tax credits by such persons against the tax imposed by § 58.1-400 and any other tax imposed by the Commonwealth. If the credits earned on or after January 1, 2006, but before January 1, 2022, exceed the state tax liability for the applicable taxable year of such person with an economic interest in coal, the excess shall be redeemable by the Tax Commissioner as set forth in subsection D of § 58.1-439.2, provided that the ability of persons with an economic interest in coal to redeem with the Tax Commissioner credits received pursuant to an allocation under this section shall expire for credits earned under this section on or after July 1, 2016.
Va. Code § 58.1-433.1