Template sensors that shouldn't be updated on reboot - energy consumption

Configuration
3

You should add availability templates to prevent the glitching:

energy_consumed:
  value_template: "{{ ((states('sensor.energy_consumed_phase_1') | float + states('sensor.energy_consumed_phase_2') | float + states('sensor.energy_consumed_phase_3') | float) /1000) | round(1) }}"
  availability_template: >
    {{ not ( is_state('sensor.energy_consumed_phase_1', 'unavailable') or
             is_state('sensor.energy_consumed_phase_2', 'unavailable') or
             is_state('sensor.energy_consumed_phase_3', 'unavailable') ) }}
  unit_of_measurement: "kWh"
  device_class: power
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