N.Y.C. Admin. Code § 19-533: § 19-533 Clean air taxis.

The commission shall approve one or more hybrid electric vehicle models for use as a taxicab within ninety days after the enactment of this law. The approved vehicle model or models shall be eligible for immediate use by all current and future medallion owners. Notwithstanding the foregoing, the commission, to the extent practicable, shall within ninety days of the effective date of the chapter of the laws of two thousand seventeen that amended this section, permit one thousand three hundred fifty of such medallions to use any hybrid electric vehicle, excluding accessible vehicles as defined by section 19-534 of this chapter, that also meets all of the requirements for use as a for-hire vehicle. For the purposes of this chapter, a hybrid electric vehicle shall be defined as a commercially available mass production vehicle originally equipped by the manufacturer with a combustion engine system together with an electric propulsion system that operates in an integrated manner.

(Am. 2017 N.Y. Laws Ch. 503, 12/29/2017, eff. 3/29/2018; Am. 2018 N.Y. Laws Ch. 339, 11/5/2018, eff. 3/29/2018)