Octopus, founded by Greg Jackson, overtook British Gas earlier this year to become the UK’s largest household energy supplier - Jeff Gilbert Octopus Energy’s tech arm Kraken has been valued at nearly $9bn (£6.4bn) after the energy giant offloaded a significant stake to a group of American backers. The UK’s biggest energy supplier on Monday said investors led by D1 Capital Partners and Fidelity International would sink about$1bn of fresh money into Kraken in return for an undisclosed stake. Some of the f ...