N.J. Stat. § 48:2-21.1
The board may, during the pendency of any hearing instituted by it, on its own initiative or on petition, in which the approval or fixing of just and reasonable individual rates, joint rates, tolls, charges or schedules thereof, as well as commutation, mileage or other special rates is in issue, or at any other time, negotiate and agree with any public utility for an adjustment of the individual rates, joint rates, tolls, charges or schedules thereof, as well as commutation, mileage or other special rates for any product or service supplied or rendered by such public utility. Such adjustment may be for, or without, a specified limit of time. In no event shall any such adjustment be regarded as contractual. Such adjustment shall at all times be subject to change through the proceedings provided for by this chapter, or through negotiation and agreement under this section. The board as a part of any such negotiation and adjustment shall provide for the continuance, suspension or other disposition of any hearing of the character aforesaid then pending.
N.J.S. § 48:2-21.1