Automation trigger lowest price or highest price of the day

[jayaarts]

Is it possible to create an automation to, for example, receive a notification if the price becomes the lowest (or highest) of the day?

[Tazzios]

You can do that with the build HA automation. You can compare current price with lowest and highest. As an action you can then send a notification. (sorry no example)

[jayaarts]

When I try to do this:
{{ states('sensor.current_electricity_price_all_in') | float == states('sensor.lowest_energy_price_today') | float }}

I get an error:
template value should be a string for dictionary value @ data['value_template']. Got None

Sorry, I'm new and helpless knowledge; trying to learn.

[bajansen]

The described template should work and it should also work without the casts to float. The lowest_energy_price_today value is retrieved from the same array as the current all-in price so the values should also be an exact match.

For me, the template {{ states('sensor.current_electricity_price_all_in') == states('sensor.lowest_energy_price_today') }} returns true or false as expected. Maybe the error occurs when the values have not yet been instantiated, such as when Home Assistant has just started.

[HiDiHo01]

I have created a binary sensor for this in configuraton.yaml

  - binary_sensor:
      - name: Happy hour
        device_class: running
        state: >
          {{ (states('sensor.current_electricity_price_all_in') | round(4,default=0) == states('sensor.lowest_energy_price_today') | round(4,default=1)) | default('off') }}

For my plugs (eg charging phone) I use this automation. It also plays a message on all my speakers

- id: '1651974863090'
  alias: Philips plug aan bij laagste tarief
  trigger:
  - platform: state
    entity_id:
    - binary_sensor.happy_hour
    from: 'off'
    to: 'on'
  condition: []
  action:
  - type: turn_on
    device_id: d7ea19752753e08adbc9baa5128b75fa
    entity_id: switch.philips
    domain: switch
  - service: tts.zeg
    data:
      entity_id: media_player.huis
      message: De elektriciteitprijs is nu het laagst
      cache: true
  mode: single

[TFhdKi95ae8L]

For me the binary sensor mentioned above did not work in my configuration.yaml.
This one did:

- platform: template
  sensors:
    happy_hour:
      unique_id: happyhour
      value_template: "{{ (states('sensor.current_electricity_price_all_in') | round(4,default=0) == states('sensor.lowest_energy_price_today') | round(4,default=1)) | default('off') }}"

[TFhdKi95ae8L]

The code mentioned above works, but only for today.
Now is the cheapest hour for today (2300), but in a few hours it'll be tomorrow and the prices are even lower (0300).
Any tips on how to account for that?

[corneyl]

I think it's better to do something with the prices attributes:

{% set endtime = (state_attr('sensor.current_electricity_price_all_in', 'prices') | 
    selectattr('till', 'gt', now()) | 
    min(attribute='price')
  ).get('till') %}
{{ timedelta(hours=0) < endtime - now() < timedelta(hours=1)  }}

This should be true when the end time (till-datetime) of the hour with the lowest prices is within one hour, so we're currently at the lowest price.

[HiDiHo01]

I think it's better to do something with the prices attributes:

{% set endtime = (state_attr('sensor.current_electricity_price_all_in', 'prices') | 
    selectattr('till', 'gt', now()) | 
    min(attribute='price')
  ).get('till') %}
{{ timedelta(hours=0) < endtime - now() < timedelta(hours=1)  }}

This should be true when the end time (till-datetime) of the hour with the lowest prices is within one hour, so we're currently at the lowest price.

Dit werkt niet bij mij....geeft altijd True aan
Zo werkt ie wel

{% set endtime = (state_attr('sensor.current_electricity_price_all_in', 'prices') |
min(attribute='price')
).get('till') %}
{{ timedelta(hours=0) < endtime - now() < timedelta(hours=1) }}

[macdivernl]

For me the binary sensor mentioned above did not work in my configuration.yaml. This one did:

- platform: template
  sensors:
    happy_hour:
      unique_id: happyhour
      value_template: "{{ (states('sensor.current_electricity_price_all_in') | round(4,default=0) == states('sensor.lowest_energy_price_today') | round(4,default=1)) | default('off') }}"

Works for me Tnx! State is “False” or “True”. (Spelling incl. caps is crucial for proper functioning)

• CONFIG -
  Core v2024.6.4
  Supervisor v2024.06.2
  Operating System v12.4
  Frontend v20240610.1
  Frank Energie v3.0.0

[macdivernl]

How would you create an extra binary sensor called e.g. “below zero” to have a longer period available in which interesting rates can be used? In my condig “Happy Hour” is one hour only

[DCSBL]

Maybe you can use a 'Threshold sensor': https://www.home-assistant.io/integrations/threshold/. Create one in 'helpers'