Carbon Intensity sensor

Using the UK carbon intensity API

sensor:
  - platform: rest
    name: Carbon Intensity
    resource: https://api.carbonintensity.org.uk/regional/regionid/2
    value_template: "{{ value_json.data[0].data[0].intensity.index }}"
    json_attributes:
      - "data"

Someone cleverer than I, can probably construct a widget etc for this :grinning:.