20(1)The regulations may make provision for recognising any of the following as equivalent to certificates under the trading scheme—U.K.
(a)allowances, credits or certificates under another trading scheme for which provision is made by regulations under this Part of this Act;
(b)units under any other trading scheme (at United Kingdom, European or international level) relating to greenhouse gas emissions.
(2)The regulations may provide—
(a)for determining the value for the purposes of the scheme of any such allowances, credits, certificates or units, and
(b)for the use for the purposes of the scheme of any such allowances, credits, certificates or units to be subject to such conditions and limitations as may be specified in or determined in accordance with the regulations.