A plug-in hybrid vehicle is a vehicle that:
Qualified plug-in hybrid vehicles also must be manufactured primarily for use on public streets, roads, highways, and not be classified as low or medium speed vehicles. Low-speed vehicles are vehicles capable of a speed of at least twenty but not more than twenty-five miles per hour, is used primarily for short trips and recreational purposes, and has safety equipment such as lights, reflectors, mirrors, parking brake, windshield, and safety belts. Medium-speed vehicles are vehicles capable of a speed of at least thirty but not more than forty-six miles per hour and has safety equipment such as lights, reflectors, mirrors, parking brake, windshield, and safety belts.
The credit is equal to six hundred sixty-seven dollars, plus one hundred eleven dollars if the vehicle has at least five kilowatt hours of battery capacity, plus an additional one hundred eleven dollars for each kilowatt hour of battery capacity in excess of five kilowatt hours. The maximum credit allowed by this section is two thousand dollars. The credit allowed by this section is nonrefundable and if the amount of the credit exceeds the taxpayer's liability for the applicable taxable year, any unused credit may be carried forward for five years.
S.C. Code § 12-6-3376
2012 Act No. 161, Section 2, provides as follows:
"This act takes effect upon approval by the Governor and applies to in-state purchases and leases made on or after the first day of the calendar month beginning at least thirty days after the effective date of this act."