Princeton is connected to the PSEG electrical grid. At peak demand, Princeton uses as much as 27 megawatts of power.
Because Princeton is such a large customer, it buys electricity at real-time prices that change every five minutes. The energy price generally correlates with how much power is being used by the whole Pennsylvania-New Jersey-Maryland grid. Based on the predicted market price, Princeton Energy Plant operators decide whether to generate electricity or purchase from the grid.