Help with simple automation: type: turn_on

Configuration
2

Please format your code correctly:

Most likely reason is that your template is comparing the string state of your sensor (states are always strings) with a number. To fix that, use:

value_template: "{{ states('sensor.nordpool_percent_to_average')|float(0) < 1}}"

Better still, use a numeric state trigger which does that conversion for you:

trigger:
  - platform: numeric_state
    entity_id: sensor.nordpool_percent_to_average
    below: 1