Our digital meter is a Sagemcom XT211 Sicona in Belgium (3F+N).
The power (kW) ,about the 3 phases, at the moment is send every second or two second = OK in Homey.
Our digital meter displays and send also the current value of the quarter-hour peak power accumulated over the last quarter-hour (15 minutes). This value resets to 0 every quarter-hour (the graph shows a sawtooth).
The highest quarter-hour peak power ultimately determines the monthly peak (I believe that value also comes from the P1 port).
After all, we pay more on our bill for a higher monthly peak. Therefore, it’s wise to monitor the quarter-hour peak power in addition to the kW and kWh and, if necessary, (temporarily) switch off (large) consumers in time. Because for one quarter-hour peak power of 10kW per month, we pay 10kW peak power for the entire month.
These values do indeed come from the P1 port of the meter (which you previously investigated). I’m currently doing this via Home Assistant, but unfortunately, it’s not yet possible to integrate it into the Homey (PRO) flows with your energy dongle in the P1 port. Because I don’t see these values coming into Homey to use in flows.
I have already make a diagnosic report on 08 feb 2026 (via app) from the the Homey Energy Dongle. The code from the report is 9171102D (the current quarter-hour peak power value was at this moment 4.93 kW)
I am eagerly looking forward to a solution within Homey (PRO)
This will only work when you create a support ticket along with it. Officially this is a users only forum.
But I guessume these peaks are not recorded as a special entity by the dongle itself, it only reports regular usage.
Concerning the peak tax:
Check the Piggy Bank app,
It’s aimed to control your power use regarding Norwegian and Belgium peak tariffs;
in short: it can turn off preferred electric devices when tariff, or power usage, or used energy exceeds defined thresholds;
I’ve since shared some information and received an email back from “Athom” support@athom.com .
They’ll review the request/suggestion to put it in place. They can’t give a timeframe for now. We’re expecting.
Arno (Athom)
Feb 11, 2026, 09:20 GMT+1
Hi Marc,
Thanks for your response and for sharing your idea with us!
I’ve added your feature request to our internal list for review by the team.
Thank you for sending the additional information. It has been added to this feature request item.
While I can’t promise whether or when this will be implemented, your suggestion is noted and will help shape future improvements to Homey.
Thanks again for thinking along with us. We really appreciate it!
blue is current capacity
orange is the quarter-hourly peak capacity
green is the monthly peak capacity (which is used at the end of the year for the final billing by the energy company)
yellow is injection capacity (from the solar panels, for example), but not important for this question.
Monthly peak power (green) is reset to 0 by the digital meter at the start of the month. From then on, you initially receive a very low value from the digital meter. It then rises again as current consumption (blue) increases multiplied by its duration. (but the digital meter calculates all of this itself and continuously sends that value to the P1 port).
So Homey (via energy dongle) should also simply be able to read this from the P1 port of the digital meter.
I can’t speak for Athom, but the HomeWizard P1 meter already exposes both values in Homey. The “P1 Meter (apiv2)” device has “Active average power over 15 minutes” (the value behind your orange line) and “Monthly Power Peak” (your green line). The older “P1 Meter” device only has the monthly peak. These should also be available as device tags for use with Logic cards in Flows, although I haven’t tried that myself. The HomeWizard reader needs the P1 port, though, so it would replace your Homey dongle or need a P1 splitter.
For automatically limiting the peak, Peter mentioned Piggy Bank above. I maintain PELS Energy Manager | Homey, which also controls power peaks and has a 15-minute mode for the Flemish capacity tariff. It can use the power readings your Homey dongle already provides, so you don’t need another reader for this.
Under Settings > Limits & safety, enable Capacity limit, set Capacity period to “15-minute average” and choose a Hard cap. PELS automatically turns selected devices down or pauses them according to your priorities to help keep the quarter-hour average below that cap, then brings them back when there is room again. Simulation mode lets you watch what it would do before enabling actual control.
It also estimates the highest fully tracked quarter-hour average this month. That is calculated from the readings PELS receives, rather than read from the digital meter, so it won’t include peaks from before PELS started tracking. Since you already have the meter’s monthly peak in Home Assistant, I’d be interested to hear how closely they match.
