Estimation, despite a fraud, of the power consumed on a phase

A power estimation method, implemented in a three-phase electricity meter connected to three phases of a distribution network, and comprising the steps of:

• detecting a fraud falsifying at least one first voltage measurement, image of a first phase voltage present on a first phase;
• acquiring at least one second voltage measurement, image of a second phase voltage present on a second phase, the at least one second voltage measurement not being falsified by the fraud;
• estimating a first phase shift between the first phase voltage- and a first phase current circulating on the first phase, by using a first phase shift estimation which is a theoretical estimation of an expected phase shift without the fraud between the first phase voltage and the second phase voltage;
• estimating at least one first electrical power consumed on the first phase from at least one first current measurement, image of the first phase current, from the at least one second voltage measurement, and from the first phase shift.