Should a national cap and trade program essentially equivalent to the requirements of Regional Greenhouse Gas Initiative (RGGI) be promulgated by the federal government, Delaware may transition into the federal program and suspend or amend its regulations accordingly, provided that any unspent funds remaining with the Sustainable Energy Utility or Department of Natural Resources and Environmental Control following cessation or suspension of the RGGI program shall be used in accordance with their initial purpose. Delaware's program shall not be abandoned until the national program is fully implemented and Delaware's regulations are amended to transition to the national program.