§ 21-f. Operating assistance for certain public utility services. Each city having a population of one million or more shall be authorized to make an appropriation, notwithstanding any provision of general, special or local law to the contrary, to a public utility service operated by such city in accordance with a local law adopted pursuant to Article 14-A of the general municipal law for the purpose of reducing the rates charged for the electricity sold and billed by such public utility service to non-residential energy users, without the billing services of a utility, so as to enable such public utility service to reduce its rates and charges in a proportion substantially equivalent to reductions effected by rebates made to non-residential energy users in accordance with a local law adopted pursuant to authorization contained in article two-G of this chapter. Any funds so appropriated shall be used by such public utility service to effect a reduction of rates and charges of such public utility service in the manner hereinabove described. For purposes of this section the terms "non-residential energy user", "rebate" and "utility" shall have the meanings ascribed by article two-G of this chapter.