Electric power generation or distribution asset monitoring

A sensor module for monitoring one or more assets in an electrical power generation or distribution system, comprising:

• a module body;
• a plurality of sensors supported by the module body, each sensor arranged to sense a parameter of the one or more assets and configured to generate a sensor output relating to the parameter;
• a plurality of sensor near field coupling structures, each sensor near field coupling structure supported on a first side of a module body and configured to transmit the sensor output from one of the sensors;
• and
• a plurality of interrogation near field coupling structures supported on a second side of the module body, each interrogation near field coupling structure configured receive the sensor output from one of the plurality of sensor near field coupling structures;
• wherein the sensor module is configured to provide electrical isolation between the one or more assets and a monitoring circuit configured to receive the sensor outputs through the interrogation near field coupling structures.