generated: '2026-07-27'
method: searched
source: live probes of the Northern Powergrid open data portal host and the corporate website host
note: >-
  The open data portal is an Opendatasoft (Huwise) hosted tenant, so the only /.well-known/ document
  served is the platform operator's RFC 9116 security.txt — it names Opendatasoft's security contact,
  not a Northern Powergrid one. The corporate site www.northernpowergrid.com returns 403 to every
  request originating outside the UK (a geo-block interstitial titled "Non-UK website users"), so no
  /.well-known/ document there could be probed from this location; that is recorded as a blocked
  probe, not as an absence.
hosts:
- host: https://northernpowergrid.opendatasoft.com
  role: open data portal + Explore API base host
  documents:
  - path: /.well-known/security.txt
    status: 200
    file: northern-powergrid-security.txt
    standard: RFC 9116
    published_by: Opendatasoft (platform operator)
  - path: /.well-known/openid-configuration
    status: 404
  - path: /.well-known/oauth-authorization-server
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /.well-known/ai-plugin.json
    status: 404
  - path: /llms.txt
    status: 404
- host: https://www.northernpowergrid.com
  role: corporate website
  probe_blocked: true
  probe_block_reason: geo-blocked outside the United Kingdom (HTTP 403 interstitial)
  documents:
  - path: /.well-known/security.txt
    status: 403
  - path: /.well-known/openid-configuration
    status: 403
  - path: /.well-known/oauth-authorization-server
    status: 403
  - path: /.well-known/api-catalog
    status: 403
  - path: /.well-known/ai-plugin.json
    status: 403
  - path: /llms.txt
    status: 403
related:
- kind: catalog
  note: >-
    The portal does publish a machine-readable catalogue, just not at /.well-known/api-catalog — it is
    a DCAT-AP export served by the Explore API itself.
  url: https://northernpowergrid.opendatasoft.com/api/explore/v2.1/catalog/exports/dcat