Octopus Energy vs EDF Energy — Which Is Better?

EDF's Trustpilot score climbed dramatically in 2025 after migrating 5.8 million customer accounts to Octopus's Kraken platform — one of the fastest migrations of this scale in the industry. Its 4.8/5 rating from 221,000 reviews appears genuine at volume. Yet institutional rankings paint a different picture: Which? placed EDF second-to-last of 17 suppliers in 2026 with a 50% score, and Citizens Advice rated it 13th, naming EDF and Utilita jointly as the worst suppliers for customer service in a 2025 press release.

The core criticism: EDF has limited contact hours and no weekend phone support — making it the most difficult major supplier to reach when problems arise. Which? gave it just 2/5 stars across all service categories including complaint handling. Octopus Energy, by contrast, has been a Which? Recommended Provider for 9 consecutive years and holds a 4.8/5 Trustpilot rating from over 779,000 reviews with broader contact access.

EDF has accelerated its smart tariff offering since moving to Kraken. Its GoElectric Overnight EV tariff at 6.49p/kWh (11pm–6am, 7 hours) is currently the cheapest overnight EV rate of any major UK supplier — narrowly undercutting Octopus Intelligent Go's ~7–8p/kWh. EDF also launched EVolve (a universal EV tariff requiring no proprietary charger) and a Heat Pump Tracker Tariff in 2025.

However, EDF still lacks the breadth that defines Octopus's portfolio. There is no EDF equivalent of Agile Octopus (half-hourly pricing that can go negative), Octopus Tracker (daily wholesale pricing), or the Flux tariffs for solar battery optimisation. EDF's smart charging automation is also more basic than Octopus Intelligent Go's AI-scheduled charging, which adapts in real time to your departure time and battery level.

This is where the comparison requires careful reading. EDF is the UK's largest zero-carbon generator, supplying electricity from its nuclear fleet with a global carbon intensity of just 26.5 g CO₂/kWh — extremely low. For customers who care primarily about carbon, EDF's nuclear-backed supply is genuinely low-impact.

However, EDF's zero-carbon credentials are primarily nuclear, not renewable. If renewable specifically means wind, solar, or hydro, EDF's standard tariffs do not qualify. Octopus Energy delivers 100% renewable electricity — 86.4% renewable and 13.6% nuclear — sourced from 700+ UK renewable generators and backed by £6 billion in generation assets. Octopus has also committed £15 billion to offshore wind, directly funding new renewable capacity.

On standard variable tariffs, both suppliers sit at the Ofgem price cap: approximately 24.67p/kWh electricity and a standing charge of around 57p/day. EDF's Simply Fixed 12-month deal typically prices at ~£1,605/year — about £36 below the Q2 2026 cap of £1,641 — making it competitive on fixed-term pricing.

For EV owners, EDF holds a genuine price edge: 6.49p/kWh overnight is the cheapest EV rate available from any major supplier as of April 2026. Octopus counters with AI scheduling and a broader smart tariff range — Agile can go negative during periods of excess renewable generation. Neither supplier charges exit fees on variable tariffs; both apply fees on fixed deals.