Step 10 Developing an Interactive Summary

With the integrated approach, the facility will be viewed as a whole whose sum total of resource use is both dynamic and interactive. Therefore, when considering energy supply, central plant, and distribution system improvement options, the analyst must consider all loads being served, such as comfort conditioning or process end-uses. This front-end analysis will then be upgraded based on the loads that would be prudently anticipated once cost-effective end-use improvements are implemented. Supply-side options, such as energy source switching, energy supplier switching, utility, negotiations, or on-site power generation, should be considered interactively with respect to the anticipated central plant, distribution system, and end-use modifications.

As indicated in the above discussion of measure interactivity, the project team should explore, for the purpose of understanding, the effect of each potential change on the rest of the facility. For example, when lighting systems, envelopes, air handling systems, or process applications are upgraded, or compressed air use is optimized, then steam, hot water, chilled water, and compressed air requirements can be significantly altered. Different capacity central plant systems may be required as a result, and the economic performance of upgrading those central systems may be changed as a result of the load changes. Conversely, when the central plant systems are upgraded, the cost of steam, hot water, chilled water, and compressed air is reduced, thereby reducing the savings potential of end-use improvements — sometimes eliminating certain improvements that would have been cost-effective with the old, less economically efficient central plant systems.

Supply-side improvements have a similar effect. If fuel or electricity can be purchased at a lower price, or if heat and power can be provided less expensively through an on-site cogeneration system, the economic performance of central plant and end-use upgrade programs will often be significantly altered. Given this potential for interactive impacts, all potentially beneficial project application options should be identified during the study process, inclusive of their interactive impact. Options should then be mixed and matched and considered interactively until the optimal portfolio of measures is selected. Therefore, it is necessary to develop a summary format that identifies the impact of individual measures, as well as the impact of the complete portfolio. The following is an example of a study report format that uses a series of linked spreadsheets to build an interactive survey of a portfolio of measures, many of which have interactive savings impact.

The process starts by building a base case with the total energy/fuel consumption and cost and OM&R cost in the scope of the analysis. The spreadsheet design allows for the comparison of the total electric and fuel consumption and costs (plus OM&R and other resources costs) before and after each proposed measure using the energy calculation model employed by the project team. This integrated analytic framework allows calculation of cost reduction potential for each individual measure while accounting for interactive effects and eliminating the potential for double counting.

1. The first section of the spreadsheet includes the historical energy (and other resource) usage, repriced at the most current energy/fuel rates, plus OM&R costs. This provides a baseline of costs.

2. The second section is constructed to perform computations, in energy units, of changes being made by the proposed project or series of projects. This includes both increases and decreases in consumption of all resources. OM&R changes are computed on a cost basis.

3. The third section then applies the net decrease (or increase) in each source of energy and other resources used to the base case consumption and recalculates the cost of the facility total energy usage, and adds in net changes in OM&R costs.

This process will then be replicated for each additional measure or group of measures by building upon what has become a revised base case. These can then be sorted in the order of measures most likely to be implemented based on cost-effectiveness or preference stated by the host facility. The spreadsheets will be repeated for each building and summed to provide a facility-wide scenario that reflects all applicable interactions. By comparing the final case to the original base case, the net resource and cost savings of the program is determined. The cost related to the impact on OM&R will be included along with energy and other resource cost savings, as well as the impact of alternative fuel and power purchasing options.

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