Upon adoption of an ordinance or resolution by an affirmative vote of a majority of the members of the board of county commissioners at any regular or special meeting of the board called for this purpose, a county may pledge utility cost savings, conservation- related cost savings or any or all of the revenue not otherwise pledged or obligated from the first one-eighth of one percent increment and of one-half of the revenue from the third one-eighth of one percent increment of the county gross receipts tax transferred to the county pursuant to Section 7-1-6.13 N.M. Stat. Ann. and any or all of the revenue from the distribution related to the first one-eighth of one percent increment made pursuant to Section 7-1-6.16 N.M. Stat. Ann. for the purpose of making payments pursuant to a guaranteed utility savings contract with a qualified provider or any installment payment contract or lease-purchase agreement pursuant to that guaranteed utility savings contract. The ordinance or resolution shall declare the necessity for the guaranteed utility savings contract and related contracts or agreements and shall designate the source of the pledged revenues. Any revenues pledged for such contract payments shall be deposited in a special fund and the county shall not use any other county or state revenue to make such payments. At the end of each fiscal year, any money remaining in the special fund after the payment obligations are met may be transferred to any other fund of the county.