1. A method of performing energy estimations operations in an intensive energy consuming site or system environment, the method comprising the steps of: (a) inputting a series of energy, emission and influencing data variables related to the intensive energy consuming site or system environment; (b) performing a first energy use prediction operation on the series of energy, emission, and influencing data variables utilising a regression prediction technique; (c) performing a second similar energy use prediction operation on the series of energy, emission, and influencing data variables utilising an artificial neural network prediction technique, wherein the first energy use prediction operation and the second energy use prediction operation occur substantially simultaneously; (d) correlating the results of the two techniques and; (e) providing an output signal indicative of the level of correlation between the two techniques.