Glow / Hildebrand Display - Local MQTT Access - Template Help

Third party integrations
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To follow up on this, I managed to resolve the warnings in the log by changing the state class to total and explicitly setting the last_reset to fix the negative cost values:

template:
  sensor:
    - name: "Smart Meter Electricity: Cost (Today)"
      unique_id: smart_meter_electricity_cost_today
      device_class: "monetary"
      state_class: "total" # requires "last_reset" for use to track costs in energy dashboard
      unit_of_measurement: "GBP"
      icon: mdi:cash
      state: "{{ (
        states('sensor.smart_meter_electricity_import_today') | float
        * states('sensor.smart_meter_electricity_import_unit_rate') | float
        + states('sensor.smart_meter_electricity_import_standing_charge') | float
        ) | round(2) }}"
      attributes:
        last_reset: "{{ today_at('00:00') }}" # required for use as "total" in energy dashboard

On why total is the right “state class” (rather than total_increasing), see the related discussion here:

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