Premium Motor Upgrade Energy Savings
The annual energy and dollars a premium-efficiency motor saves over the one it replaces: input kW = HP x 0.746 x load / efficiency, so the saving = (kW at the old efficiency - kW at the new) x run hours x rate. A 50 hp motor at 75% load going 90% -> 94.5% over 4,000 hr at $0.12 saves about $710/yr; at full load the same swap saves about $947, because the fixed efficiency gap acts on more power. Energy charge only; the utility tariff and any rebate change the payback. A screening estimate, not a metered M&V.
Formula and source
kw = HP x 0.746 x load / efficiency; annual_saving = (kw_standard - kw_premium) x hours x rate.
Premium-motor energy-saving comparison, standard motor-efficiency retrofit practice (NEMA Premium / DOE motor efficiency levels) by name; first-principles input-power relation.
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