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Energy, telecoms & utilitieswww.edfenergy.com

EDF Energy — website check

Energy company in the United Kingdom, founded 1989, based in London. EDF Energy’s website (www.edfenergy.com) runs on Drupal. It is delivered through Amazon CloudFront. Email from the domain is protected by an enforced DMARC policy.

82
Brand Web Indexout of 100

Share of 26 technical checks the site passes: security, speed, email and SEO. A measurement of the website — not a popularity ranking.

100
Security
60
Speed & delivery
75
Email & domain
82
SEO & markup
Official siteChecked 23 Oct 2026

About the brand

Founded1989
CountryUnited Kingdom
HeadquartersLondon
IndustryEnergy industry
Part ofÉlectricité de France
Official websitewww.edfenergy.com

Facts: Wikidata (CC0).

Built with

CMSDrupal
Tag managersGoogle Tag Manager
CDNAmazon CloudFrontjsDelivrunpkg
CSS frameworksBootstrapTailwind CSS
JavaScript librariesLottie
A/B testingGrowthBook
Web fontsGoogle Fonts
ReviewsTrustpilot
Monitoring & RUMDynatrace

Hosting & delivery

Network (AS)Amazon Web Services
HTTP versionHTTP/3
TLSTLS 1.3
CertificateDigiCert Inc · valid until 2027-04-30
First response2,776 ms
Homepage weight66 KB
IPv6yes

Email & domain

Mail providerMimecast
SPFyes
DMARC policyp=reject
BIMIno
DNSSECno
CAAyes
Verified servicesApple (domain verification), Atlassian Cloud, Google Search Console, Microsoft 365, Miro, Stripe

SEO & social

Title64 characters
Meta description174 characters
Canonicalyes
Structured dataArticle, Organization
Language versions0
Open Graphno

AI crawlers & robots

AI crawlers blockednone
llms.txtyes
ads.txtno
security.txtno

Checklist

Security

  • HTTPS by default
  • HSTS header
  • TLS 1.3
  • Content-Security-Policy
  • X-Content-Type-Options
  • Referrer-Policy

Speed & delivery

  • HTTP/3
  • IPv6
  • First response under 1.5 s
  • Homepage under 1.5 MB

Email & domain

  • SPF record
  • DMARC record
  • DMARC enforced (quarantine / reject)
  • BIMI logo record
  • DNSSEC
  • CAA record

SEO & markup

  • Title tag 10–70 characters
  • Meta description
  • Canonical link
  • Exactly one H1
  • Structured data (JSON-LD)
  • Open Graph title and image
  • All images have alt text
  • XML sitemap
  • robots.txt
  • security.txt

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Gulf Oil International www.gulfoilltd.com Drupal 100606373 76

Data from our own crawler: homepage, DNS, TLS and robots.txt of each brand’s official website. coolbrands.uk.com is an independent catalogue. It is not affiliated with Superbrands (UK) Ltd or the CoolBrands® awards programme, and does not publish their results.

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