SuperValu and Centra stores have reduced their carbon emissions by 9% in the past year, according to the brands' owner Musgrave Group.
The announcement comes just over a year after the company announced a €25m sustainability fund, which is designed to fund green investments in its store network.
Musgrave’s aims to use the fund to help cut its carbon emissions - including those from its energy usage - by 46% by 2030.
It is aiming to become net zero by 2040.
The €25m is being complimented by investments from SuperValu and Centra retailers, with a combined €27.7m invested to date.
It said that, by the end of this year, more than 26,500 solar panels will have been installed across 100 stores in the group.
Investments have also gone towards the upgrading of freezer and refrigeration units and the installation of LED lighting.
Musgrave’s aim to have LED lighting installed in all its stores by 2025, with doors fitted in 75% of its outlets’ fridges by that stage too.
As part of its sustainability strategy, Musgraves has also committed to having all of its own-brand packaging made from recyclable, reusable or compostable material by 2025.
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It is also targeting a 50% reduction in food waste by 2030.