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Update electricity-grid.markdown (#29853)

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* Update electricity-grid.markdown

Added IEC62056-21 protocol data reading option.

* tiny tweaks

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Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>
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@ -45,6 +45,12 @@ We have developed [Home Assistant Glow](https://github.com/klaasnicolaas/home-as
![Photo of Home Assistant Glow attached to an electricity meter](/images/docs/energy/home-assistant-glow.jpg)
#### Reading the meter via a IEC62056-21
The IEC62056-21 is a common protocol not only for electric meters. It uses an infrared port to read data.
[Aquaticus](https://github.com/aquaticus) has created an [ESPHome component](https://community.home-assistant.io/t/new-iec62056-21-component/555236) for reading this data. [PiggyMeter](https://aquaticus.info/meter.html) is a complete project that allows easy installation.
![Photo of PiggyMeter attached to an electricity meter](https://aquaticus.info/_images/meter_and_probe.png)
#### Using (Smart Message Language) interface
In countries like Germany, SML (Smart Message Language) is used typically. ESPHome's [SML (Smart Message Language)](https://esphome.io/components/sml.html) is one way to integrate it. If you prefer to integrate it via MQTT, [sml2mqtt](https://github.com/spacemanspiff2007/sml2mqtt) is another open source option.