6. The charge prescribed for the subsistence of a greenhouse gas emissions permit under paragraph 4 or 5 of this Schedule shall not be payable in respect of a greenhouse gas emissions permit relating to—
(a)an installation which is for the duration of the financial year to which the charge relates an excluded installation;
(b)a planned installation which is not put into operation during the financial year to which the charge relates; or
(c)an installation in respect of which a retention notice has been served prior to 1st April in the financial year to which the charge relates and is not revoked during that financial year.