The work also involves construction of of 132 kilovolt transmission lines. Power is distributed over multiple 500 kilovolt (kV) transmission lines. Potentials in the kilovolt range can be realized without electrochemically degrading the hydrogel. The abrupt decrease of current can result in kilovolt inductive voltage spikes and arcing. They are generally powered by several kilovolt biases using either AC or pulsed power supplies. The railway uses a single phase, 25 kilovolt AC supply for traction for all lines.