N.J. Stat. § 54:30A-126
The repeal of and amendments to various provisions of law pursuant to P.L. 1997, c. 162(C.54:10A-5.25 et al.), prospectively eliminating the imposition of unit-based energy taxes on gas, electric and gas and electric public utilities pursuant to P.L. 1940, c.5 (C.54:30A-49 et seq.) and amendatory and supplementary acts thereto shall not affect the obligation of each such public utility taxpayer, on or before April 1, 1998, to file a final tax form with the director pursuant to subsection c. of section 10 of P.L. 1991, c.184 (C.54:30A-54.6). Any remaining tax liability due by the taxpayer on the final tax form shall be submitted with the final tax form. However, any overpayment shown on the final tax form shall be taken as a credit against the uniform transitional utility assessment to be paid June 25, 1998 pursuant to sections 50 through 58 of P.L. 1997, c. 162(C.54:30A-114 through C.54:30A-122).
N.J.S. § 54:30A-126