In literature, there are two ways to apply inputoutput technique to analyzing problems related to energies, the hybrid type energy inputoutput model and the

monetary type energy inputoutput model. In this paper, the features and differences of two types of energy inputoutput models are studied and proved from the viewpoint of energy balance equations. The main conclusions are as follows. Firstly, when the matrix of technology coefficients is stable, the hybrid type energy inputoutput model still satisfies the energy balance equations, and keeps consistency under the impact of new final demands. Secondly, for the monetary type energy inputoutput model, if the matrix of technology coefficients and the matrix of energy prices keep stable, the monetary inputoutput equations are satisfied, and the energy consumptions are the results of adjusting monetary inputoutput equations by the matrix of energy prices, when there is a vector of new final demands. It means that although the energy balance equations are used in the process of constructing a monetary type energy inputoutput model, its fundamental starting point is not the energy balance equations, but the monetary inputoutput equations. Therefore, a monetary type energy inputoutput model does not take energy balance equations into consideration, and does not consider whether the energy balance equations are

still satisfied when a vector of new final demands comes out and whether the energy consumptions are consistent. In this sense, a hybrid unit energy inputoutput model is more reasonable than a monetary type energy inputoutput model. Thirdly, it is proved that in some special cases, the monetary type energy inputoutput model is equivalent to the hybrid unit energy inputoutput model. The arguments provide guidelines for choosing a proper model when using energy inputoutput technique.

energy , inputoutput model , energy balance equations