Unable to use the workday integration for next days values in additional costs. about nordpool HOT 10 CLOSED

Yeah. All you need just a sensor that has a holiday attribut. The example i provided has dict of all holydays so you can format the datetime to a str and use a .get and check if the value is not None.

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The easiest way i can think is to check if utcnow and now is the same date. The integration patches now so it always in the context of the current hour. So if the day isnt the same its tomorrow.

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Does that mean that the additional cost template is evaluated per hour and takes date into account?

If that is the case I suppose my template should work as intended?

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Ah, no, it does not work.
To summarise… We receive prices for tomorrow at 13:00 here. This means that we need a way to check if tomorrow is a workday, which I currently am unable to see how is done. The workday status defines the level of taxes on electricity, so it is crucial to get a correct reading of the next day price level.

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Or does now() always relate to the hour being evaluated? If that is the case, could it work to compare as_timestamp(now()) | timestamp_custom("%F") against a list of known holidays?

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https://github.com/custom-components/nordpool#additional-costs

Yes, its patched so it always refer to the hour for the price.

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Instead if a static list of holydays you can use https://github.com/partofthething/next-holiday-sensor

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Oh, the list is not static, it is dynamically provided by the Holidays integration (https://github.com/bruxy70/Holidays). It seems it does much of the same as the one you suggest?

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Please post your solution so other can reuse it if they face the same issue.

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Sure! :-)
Within a "it works on my machine" scope, here is my template:

    {# January to March - Weekend and holiday taxes #}
    {% if (as_timestamp(now()) | timestamp_custom("%F")) in (state_attr('calendar.holidays','holidays') | list) and (now().month >= 1 and now().month <= 3) %}
      {% set el_taxes = 0.3558 %}
    {# April to December - Weekend and holiday taxes #}
    {% elif (as_timestamp(now()) | timestamp_custom("%F")) in (state_attr('calendar.holidays','holidays') | list) and (now().month >= 4) %}
      {% set el_taxes = 0.4393 %}
    {# January to March - Dyatime taxes #}
    {% elif (now().month >= 1 and now().month <= 3) and (now().hour >= 6 and now().hour <= 22) %}
      {% set el_taxes = 0.4738 %}
    {# January to March - Night taxes #}
    {% elif (now().month >= 1 and now().month <= 3) and (now().hour >= 23 or now().hour <= 5) %}
      {% set el_taxes = 0.3558 %}
    {# April to December - Day taxes #}
    {% elif (now().month >= 4) and (now().hour >= 6 and now().hour <= 22) %}
      {% set el_taxes = 0.5573 %}
    {# April to December - Night taxes #}
    {% elif (now().month >= 4) and (now().hour >= 23 or now().hour <= 5) %}
      {% set el_taxes = 0.4393 %}
    {% endif %}
    {% if current_price > 0.875 %}
        {% set subs = (current_price - 0.875) * 0.9 %}
        {% set additional_cost = el_taxes - subs %}
    {% elif current_price <= 0.875 %}
        {% set additional_cost = el_taxes %}
    {% endif %}
    {{ additional_cost | round(4) }}

I've also posted it in the HA community forums (HA Foums) and at Hjemmeautomasjon.no (Hjemmeautomasjon)

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