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How is the tax deduction permitted by EPAct determined for the interim lighting rule?

April 26, 2017epact Interim lighting permitted rule tax deduction

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How is the tax deduction permitted by EPAct determined for the interim lighting rule?

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The interim lighting rule deduction is calculated based on watts-per-square-foot (lighting power density) of the new lighting system. It is not based on the actual hours of energy use. In most common situations, if the watts-per-square-foot of the new lighting system is at least 25% below the lighting power density specified in 2001 ASHRAE/IESNA 90.1 standard, you may be eligible for an accelerated tax deduction.