hass_example.yaml

# add this to your "sensor:" block
# replace <meterID> with the unique ID of the meter you want to measure
# also make sure to run the metermon container with the "METERMON_SEND_BY_ID" environment variable set to true

  -  platform: mqtt
     name: "Electric Meter Consumption"
     state_topic: "metermon/<meterID>" # <--- change this
     value_template: "{{ value_json.Consumption }}"
     unit_of_measurement: 'kWh'
     device_class: 'energy'
     state_class: 'total_increasing'
     availability:
      - topic: "metermon/status"
        payload_available: "Online"
        payload_not_available: "Offline"
     json_attributes_topic: "metermon/<meterID>" # <--- change this

  -  platform: mqtt
     name: "Gas Meter Consumption"
     state_topic: "metermon/<meterID>" # <--- change this
     value_template: "{{ value_json.Consumption }}"
     unit_of_measurement: 'ft³'
     device_class: 'gas'
     state_class: 'total_increasing'
     availability:
      - topic: "metermon/status"
        payload_available: "Online"
        payload_not_available: "Offline"
     json_attributes_topic: "metermon/<meterID>" # <--- change this

   -  platform: mqtt
      name: "Water Meter Consumption"
      state_topic: "metermon/<meterID>" # <--- change this
      value_template: "{{ value_json.Consumption }}"
      unit_of_measurement: 'gal'
      #device_class:
      state_class: 'total_increasing'
      availability:
       - topic: "metermon/status"
         payload_available: "Online"
         payload_not_available: "Offline"
      json_attributes_topic: "metermon/<meterID>" # <--- change this
      
 #create a 'utility_meter:' block
 utility_meter:
  gas_utility:
    source: sensor.gas_meter_consumption
    cycle: monthly #replace with daily|monthly|bimonthly, etc to have usage reset rather than always incrementing (as some meters do)
  water_utility:
    source: sensor.water_meter_consumption
    cycle: monthly
  gas_utility:
    source: sensor.electric_meter_consumption
    cycle: monthly