The governing body of any city may provide funding from revenues derived from the capital improvements fund levy under section 57-15-38 for a fire department capital improvements and equipment acquisition and maintaining structural and mechanical components for fire department stations. Any levy under this section approved by the electors of a city before January 1, 2015, remains effective for ten taxable years or the period of time for which it was approved by the voters, whichever is less, under the provisions of this section in effect at the time it was approved. When the authority to levy under this section expires in a city, any unobligated balance in the fire department reserve fund must be transferred to the city capital improvements fund.