GLOW_DEVICE_ID
with the relevant information for your device):
mqtt:
sensor:
- name: "Home Power"
state_topic: "glow/GLOW_DEVICE_ID/SENSOR/electricitymeter"
unit_of_measurement: 'W'
value_template: "{{ (value_json['electricitymeter']['power']['value'] * 1000) | int }}"
icon: 'mdi:flash'