Octopus Energy have been recommend by Which? consumer magazine for many years.
Many promote Octopus as cheaper due to their Tracker and Agile Tariffs. But that is not comparing with like; whether these tariffs suit a customer depends on their attitude to risk, and if they want headspace taken up with ever-changing rates, then you cannot recommend a tracker without a clear understanding of the customer. Not everyone will want to commit to checking trends in unit rates every couple of weeks to mitigate risk. Perhaps in order to plan and budget, they want to fix and forget even if they then pay now a high forward buying hedging premium due to volatility in prices via Octopus rather than take risks themselves under Tracker.
Several other suppliers such as Good Energy use Octopus' Kraken IT system but in case of Good Energy and Coop also customers service. But have different energy mix of sources they purcahse energy from, but both support renewables. Good Energy remove meters and cap gas supplies for free, like Octopus.
Octopus like many supplier have refferal scheme which is annoying spammed onto various consumer energy forums, despite Octopus Energy's rules on their use:
"7.5.6 We have reason to believe you are sending or advertising your Personalised Link to people who are not known to you or if you are in any way trying to benefit from our referral scheme on a commercial basis rather than for personal use. We may review any account we think might be "taking the mickey" particularly if we receive complaints from other customers, or if you have referred over 10 people in any 12 month period and we reserve the right to deactivate your Personalised Link or move you to a different scheme."
They use a two word combo refferal link code schema
I will also added related links including other suppliers using Octopus Kraken Tech and also electricification of heat below.
If you use Facebook then many Octopus groups some dedicated to specific tarrifs. Also those with Octopus Energy share experiances on Energy GB Facebook group.