Octopus Energy’s generation arm is to invest £15bn in offshore wind by 2030.
This will go towards the generation of 12 GW of renewable electricity a year, enough power for 10 million homes.
Octopus is targeting projects across the globe, with a focus on Europe – and already has several deals in the pipeline.
It will back developers of new offshore wind farms as well as wind farms that are under construction or operational.
Octopus already manages £6bn worth of green energy projects globally.
The global energy and technology group first entered the offshore wind farm market last year and has since made five offshore deals, amounting to a total of $1bn (£800m).
Octopus has stakes in the Lincs offshore wind farm and one of the world’s largest windfarms, Hornsea One – both are located off the east coast of England.
It has acquired the Borssele V wind farm in the Netherlands, which has some of the world’s largest turbines.
It also backs Simply Blue, a developer of innovative floating offshore wind projects, a type of offshore wind technology that taps into strong winds deeper out at sea.
Octopus says scaling investment in offshore wind will not only create more clean energy but also job opportunities.
Zoisa North-Bond, CEO of Octopus Energy Generation, said: “Offshore wind has already rapidly transformed the UK’s energy system – and we’re incredibly excited about the potential for this technology globally. We’ve got big plans to invest in even more of these big fans to help wean ourselves off polluting gas.
“Offshore wind will undoubtedly continue to play a pivotal role in meeting net zero, boosting energy security and driving down bills.”