The scheme, introduced in January 2013, required energy companies to install energy saving measures such as wall insulation, loft and cavity wall insulation and boiler replacements to save customers money on their energy bills, and was targeted at those at greatest risk of being in fuel poverty.
Eon said it had fitted more than 48,000 replacement boilers that will deliver a lifetime energy bill savings of more than £733 million.
More than 106,000 vulnerable people had been helped by the company meeting its obligations, Eon said.
Eon’s director of energy efficiency, Don Leiper said: “We’ve worked alongside local authorities, housing associations and social landlords to identify the people who most need this help as well as helping to sustain jobs and skills in an industry that supports tens of thousands of people across the UK in businesses of all sizes.
“While we’ve met our targets more than three months early, we cannot be complacent and our work continues across the country so many more households and families can feel the benefit in the future.”
EDF Energy also announced last week that it had met its targets under the Eco scheme.
Eon was the first major energy supplier to announce it had met its targets for the Carbon Emissions Reduction Target and Community Energy Saving Programme schemes which Eco replaced.