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If you have had an electricity meter installed in the last few years, or you have installed a solar PV installation, your electricity meter(s) will be electronic with an LED which flashes. The rate of this flashing is proportional to the amount of power passing through the meter, and so useful information is there to be collected.
The frequency of pulses indicates the power demand. The number of pulses indicates energy metered!
![](https://i.ytimg.com/vi/kXUUiFysoI8/maxresdefault.jpg)