Vorteil von Templates ist die Möglichkeit, eine eindeutige ID zu vergeben und so den Sensor einem Raum zuordnen zu können. Das geht mit manuell in yaml konfigurierten Sensoren meines Wissens nicht.

/config/configuration.yaml
sensor: !include_dir_list sensors/
/config/sensors/Dingz/DGZ_Bad.yaml

platform: rest
method: GET
resource: http://192.168.1.190/api/v1/state
name: Dingz Bad State
value_template: "OK"
json_attributes:
  - "dimmers"
  - "blinds"
  - "led"
  - "sensors"
  - "thermostat"
  - "wifi"

/config/sensors/Template/Templated Sensors.yaml

platform: template
sensors:
  dingz_bad_temperature:
    friendly_name: 'Bad Dingz °C'
    value_template: '{{ states.sensor.dingz_bad_state.attributes[''sensors''][''room_temperature'']|float|round(1) }}'
    device_class: temperature
    unit_of_measurement: '°C'
    unique_id: template.sensor_temperature_bad
  dingz_bad_power:
    friendly_name: 'Bad Dingz W'
    value_template: "{{ 
      (
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][3]['value']
      )|float|round(1) 
      }}"
    device_class: power
    unit_of_measurement: 'W'
    unique_id: template.sensor_power_bad

was man dann auch noch machen kann ist sowas ;-)

/config/sensors/Template/Templated Sensors.yaml

platform: template
sensors:
  mystrom_and_dingz_all_power:
    friendly_name: 'All Strom W'
    value_template: "{{ 
      (states.sensor.mystrom_beamer_report.attributes['power'] +
      states.sensor.mystrom_buro_stephan_report.attributes['power'] +
      states.sensor.mystrom_entfeuchter_report.attributes['power'] +
      states.sensor.mystrom_geschirrspuler_report.attributes['power'] +
      states.sensor.mystrom_hifi_center_report.attributes['power'] +
      states.sensor.mystrom_keller_report.attributes['power'] +
      states.sensor.mystrom_kuhlschrank_report.attributes['power'] +
      states.sensor.mystrom_luftung_report.attributes['power'] +
      states.sensor.mystrom_nas_switch_report.attributes['power'] +
      states.sensor.mystrom_presence_report.attributes['power'] +
      states.sensor.mystrom_reolink_report.attributes['power'] +
      states.sensor.mystrom_schrank_lufter_report.attributes['power'] +
      states.sensor.mystrom_sideboard_report.attributes['power'] +
      states.sensor.mystrom_terrasse_report.attributes['power'] +
      states.sensor.mystrom_tumbler_report.attributes['power'] +
      states.sensor.mystrom_waschmaschine_report.attributes['power'] +
      states.sensor.mystrom_welcome_report.attributes['power'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_bad_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_dusche_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_dusche_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_dusche_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_dusche_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_kuche_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_kuche_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_kuche_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_kuche_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_markise1_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_markise1_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_markise1_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_markise1_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_markise23_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_markise23_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_markise23_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_markise23_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_markise45_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_markise45_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_markise45_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_markise45_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_schlafzimmer_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_schlafzimmer_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_schlafzimmer_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_schlafzimmer_state.attributes['sensors']['power_outputs'][3]['value'] +
      states.sensor.dingz_wohnzimmer_state.attributes['sensors']['power_outputs'][0]['value'] +
      states.sensor.dingz_wohnzimmer_state.attributes['sensors']['power_outputs'][1]['value'] +
      states.sensor.dingz_wohnzimmer_state.attributes['sensors']['power_outputs'][2]['value'] +
      states.sensor.dingz_wohnzimmer_state.attributes['sensors']['power_outputs'][3]['value'] 
      )|float|round(1)
      }}"
    device_class: power
    unit_of_measurement: 'W'
    unique_id: template.sensor_power_all

Off Dingz Topic, weil MyStrom, aber vielleicht interessiert es:

/config/sensors/MyStrom/ECS_Beamer.yaml

platform: rest
method: GET
resource: http://192.168.1.211/report
name: MyStrom Beamer Report
value_template: "OK"
json_attributes:
  - "power"
  - "Ws"
  - "relay"
  - "temperature"

/config/sensors/Template/Templated Sensors.yaml

platform: template
sensors:
  mystrom_beamer_temperature:
    friendly_name: 'Beamer MyStrom °C'
    value_template: '{{ states.sensor.mystrom_beamer_report.attributes[''temperature'']|float|round(1) }}'
    device_class: temperature
    unit_of_measurement: '°C'
    unique_id: template.sensor_temperature_beamer
  mystrom_beamer_power:
    friendly_name: 'Beamer MyStrom W'
    value_template: '{{ states.sensor.mystrom_beamer_report.attributes[''power'']|float|round(1) }}'
    device_class: power
    unit_of_measurement: 'W'
    unique_id: template.sensor_power_beamer