Various embodiments relate to detecting theft of electrical energy. A method of detecting theft of electrical energy may include measuring, for each time sample of a number of time samples, a neutral current of an electrical energy metering system. The method may further include summing, for each time sample of the number of time samples, a number of measured phase current values of the electrical energy metering system to determine an imputed neutral current. Further, the method may include determining, for each time sample of the number of time samples, a squared difference between the measured neutral current and the imputed neutral current. Moreover, the method may include integrating, for each time sample of the number of time samples, the squared difference to determine an accumulator value. In addition, the method may include detecting, based on the accumulator value, theft of electrical energy from the electrical energy metering system.
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