Abstract: A computer is used for obtaining information about a plural number of energy-saving measures. This can include information about costs of combinations of said energy-saving measures, said costs include first information about costs of making the measures, second information about rebates for the measures, and third information about energy-saving that will occur from the measures, where at least some of said third information will depend on said combinations of said energy-saving measures. An iterative algorithm is used which determines combinations and which determines which of the combinations produce maximum savings by combinations of the said first, second and third information. A report can be created.