Methods, apparatus, and media for controlling supply of a utility service to a load are disclosed. Generally, the embodiments may involve receiving representation of utility service supply to a load, receiving and storing in a computer data storage device a usage range representation comprising at least one expected value of utility input to the load and/or at least one expected value of output from the load, and producing a control signal for use by a utility service supply controlling device when usage is outside of usage range representation. Control signal can be operable to cause the utility service supply controlling device to restrict or interrupt the supply of the utility service to the load.