# Is this possible? Tracking cost of electricity that is charged on 1/2 hour variable tariff

**URL:** <https://community.openenergymonitor.org/t/is-this-possible-tracking-cost-of-electricity-that-is-charged-on-1-2-hour-variable-tariff/10157>\
**Category:** Emoncms\
**Tags:** octopus\
**Created:** [19 February 2019 10:27 UTC](https://community.openenergymonitor.org/t/is-this-possible-tracking-cost-of-electricity-that-is-charged-on-1-2-hour-variable-tariff/10157 "2019-02-19T10:27:28Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![ian](https://community.openenergymonitor.org/letter_avatar_proxy/v4/letter/i/bb73d2/32.png) [@ian](https://community.openenergymonitor.org/u/ian)\
**Post date:** [20 February 2019 10:22 UTC](https://community.openenergymonitor.org/t/is-this-possible-tracking-cost-of-electricity-that-is-charged-on-1-2-hour-variable-tariff/10157/3 "2019-02-20T10:22:19Z")

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Great, I will read through that. As luck would have it I am using the sonoff plugs and relays already. This may save me some work.

> [@Emoncms Demand Shaper module](https://community.openenergymonitor.org/t/emoncms-demand-shaper-module/9097/1):
>
> [https://github.com/openenergymonitor/EmonESP/blob/control\_merge/sonoffS20.md](https://github.com/openenergymonitor/EmonESP/blob/control_merge/sonoffS20.md)

This link gives 404 error.

Ian

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