S.C. Code § 58-5-480
The Office of Regulatory Staff is authorized additional positions as the General Assembly may provide in the annual General Appropriations Act for the purpose of performing its duties under this article; however, no more than one position for each natural gas utility regulated pursuant to this article may be authorized. All salaries, benefits, expenses, and charges incurred by the Office of Regulatory Staff for these positions must be borne by the natural gas utilities regulated pursuant to this article.
On or before the first day of July in each year, the Department of Revenue must assess each natural gas utility regulated pursuant to this article an equal portion of these salaries, benefits, expenses, and charges on the thirtieth day of June preceding that on which the assessment is made which is due and payable on or before July fifteenth. The assessments must be charged against the natural gas utilities by the Department of Revenue and collected by the department in the manner provided by law for the collection of taxes from the natural gas utilities, including the enforcement and collection provisions of Article 1, Chapter 54 of Title 12 and paid, less the Department of Revenue actual incremental increase in the cost of administration into the state treasury as other taxes collected by the Department of Revenue for the State. These assessments are in addition to any amounts assessed pursuant to Section 58-4-60. These assessments must be deposited in a special fund with the State Treasurer's Office from which the salaries, benefits, expenses, and charges shall be paid.
The Office of Regulatory Staff must annually certify to the Department of Revenue on or before May first the amounts to be assessed.
S.C. Code § 58-5-480