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This is like asking how tasty next year's wine crop will be. The number of factors with regard to energy usage, efficiency and savings are enormous. For example, if a facility is manually controlled by a diligent facilities manager, the savings may not be high at all. If the facility has little current regard for energy efficiency, the savings could be significant. The types of savings not only include a reduction in energy consumption, but also in demand and quite possibly power factor control (for electricity) as well as fuel savings for cooling and heating water and other fossil fuel consuming equipment.
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