curl --request GET \
  --url https://api.voltview.co.uk/v1/sites/{siteId}/peakDemand \
  --header 'x-api-key: <api-key>'

{
  "siteId": "<string>",
  "peak": 123,
  "timestamp": "2023-11-07T05:31:56Z",
  "averageDemand": 123,
  "loadFactor": 123
}