g. No owner of a regulated vehicle or regulated equipment shall be required to install or use a retrofit device on a regulated vehicle or piece of regulated equipment as required pursuant to a supplement to a fleet retrofit plan or combined fleet retrofit plan, or a modification to a fleet averaging plan or, any part of such a supplement or a modification, in any year unless the State Treasurer certifies for that year that the constitutionally dedicated moneys have been deposited in the Diesel Risk Mitigation Fund, and the Department of Environmental Protection certifies that sufficient moneys are available in the fund to pay the cost of purchase and installation of the retrofit devices required to be used by an owner by rule or regulation or by the supplement to a fleet retrofit plan or combined fleet retrofit plan or the modification to a fleet averaging plan in that year. Provided that the State Treasurer has issued the certification that the constitutionally dedicated moneys have been deposited in the fund for that year, the department may determine the amount of moneys available in the fund for that year, require the purchase and installation of those retrofit devices in those regulated vehicles or pieces of regulated equipment for which sufficient moneys are available, and certify that sufficient moneys are available for those retrofit devices to be purchased for, and installed in, those regulated vehicles or pieces of regulated equipment.