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ATTACHMENT 4 <br /> Measure Specific Lighting Savings <br /> Per Option A, Pre measurements with annual post spot measurements will be taken to establish energy <br /> consumption , for a representative sample of the lights , and pre measurement at full load , with annual post spot <br /> measurements for the lighting . These measurements will be accomplished through the use of hand held <br /> meters and/or mounting of temporary meters ( by FPL ENERGY SERVICES , INC ) . The results will be used to <br /> prorate the calculated savings , thus determining the adjustment ( +/-) , to be used in the comparison with the <br /> Guaranteed Savings . <br /> Equations for Calculating Lighting Energy and Demand Savings <br /> To determine estimates of energy savings for lighting efficiency projects use the following equation : <br /> kWh Savingst (kW/Fixturebaseiine x Quantitybaseiine - kW/Fixturepost x QuantitYpost) x Hours of <br /> Operation]t, u <br /> where : <br /> KWh Savings = kilowatt-hour savings realized during the post- installation time <br /> period t <br /> KWAWUrebaseiine = lighting baseline demand per fixture for usage group u <br /> kW/fixturepost = lighting demand per fixture during post-installation period for <br /> usage group u <br /> Quantitybaseiine = quantity of affected fixtures before the lighting retrofit for usage <br /> group u, adjusted for inoperative and nonoperative lighting fixtures <br /> Quantitypost = quantity of affected fixtures after the lighting retrofit for usage <br /> group u <br /> Hours of Operation = number of operating hours during the time period t for the usage <br /> group u , assuming operating hours are the same before and after <br /> measure installation <br /> Demand <br /> Demand savings can be calculated as either an average reduction in demand or as a maximum reduction in <br /> demand . <br /> Average reduction in demand is generally easier to calculate . It is defined as kWh savings during the time <br /> period in question (e . g . utility summer peak period ) divided by the hours in the time period . <br /> Maximum demand reduction with respect to cost savings , is typically the reduction in utility meter maximum <br /> demand under the terms and conditions specified by the servicing utility . For peak load reduction , for example , <br /> the maximum demand reduction may be defined as the maximum kW reduction averaged over 30-minute <br /> intervals during the utility' s summer peak period . The maximum demand reduction is usually calculated to <br /> determine savings in utility peak demand charges . <br /> Indian River County , Florida 13 Indian River County Phase 1 <br /> Phase I - - Rev . 1 /05/09 <br />