The UK energy supplier has made the transition to renewable, which translates to 3.3 million UK homes with severely reduced carbon-emissions.
E.ON is generating a large amount of power through its own generation sites, comprised of solar, wind and biomass across the UK.
At present, the utility is able to power 1.7 million homes, with the remaining 1.6 million powered through agreements with 16 UK-based independent wind generators, and EU-based green-energy suppliers via renewable guarantee certificates.
The move is expected to have no impact on current electricity pricing.
Michael Lewis, E.ON UK Chief Executive said: “Climate change is the defining issue of our era and one that energy customers are increasingly concerned about. We believe large-scale action can make significant change possible and we’re committed to playing a leading role and setting an example for others to follow, that’s why we’re providing all of our residential customers with 100% renewable electricity as standard – a change at a scale never seen before in Britain.
“Our announcement is an important first step in a journey towards a more sustainable and personalised energy system but the future of energy doesn’t stop here. The opportunities include helping all of our customers to better manage their energy through smart, personalised and sustainable technologies.”