Self-calibrating contactless power consumption sensing

A method of sensing electrical power being provided to a structure using a sensing device, a calibration device, and one or more processing modules, the sensing device being attached to a panel of a circuit breaker box, the panel of the circuit breaker box overlying at least a part of one or more main electrical power supply lines for an electrical power infrastructure of a structure, the calibration device comprising a load unit, the method comprising:

• determining a current flowing in the one or more main electrical power supply lines based at least in part on one or more output signals of the sensing device;
• and
• determining a phase difference between the current flowing in the one or more main electrical power supply lines and a voltage of the one or more main electrical power supply lines measured by the calibration device,
• wherein:
• the calibration device is electrically coupled to the electrical power infrastructure of the structure;
• the sensing device comprises one or more magnetic field sensors configured to measure a magnetic flux produced by at least a part of the one or more main electrical power supply lines and generate the one or more output signals of the sensing device based on the magnetic flux measured by the sensing device;
• and
• the sensing device is devoid of being electrically or physically coupled to the one or more main electrical power supply lines.