The State's goals for the dates of removal of transformers owned by public utilities that contain polychlorinated biphenyls in concentrations at or above 50 parts per million are as follows. For the purposes of this section, removal of a transformer that contains polychlorinated biphenyls may be accomplished through the retrofilling of the transformer with oil that contains polychlorinated biphenyls in concentrations below 50 parts per million. [1999, c. 193, §1 (NEW).]