Not later than 45 days after the date of the publication of an energy conservation target for a State under
section 8511(b) of this title, the Governor of that State shall submit to the Secretary a State emergency conservation plan designed to meet or exceed the emergency conservation target in effect for that State under
section 8511(a) of this title. Such plan shall contain such information as the Secretary may reasonably require. At any time, the Governor may, with the approval of the Secretary, amend a plan established under this section.