The Moree store adds to the 100 Woolworths Group sites that will draw from solar power across Australia by the end of 2019.

The 99.96 kilowatt solar arrays on the roof are made up of 357 high efficiency solar panels spanning around 600 square metres.

The solar system has the capacity to generate more than 150,000kW hours each year - the equivalent to 23 Australian households' annual energy consumption.

They will help offset approximately eight per cent of the store's energy consumption.

"From store lighting and air-conditioning to food refrigeration and preparation, there is no doubt supermarkets are energy intensive to run," Woolworths Moree store manager Andrew Finch said.

"In recent years we've been working to run our stores more sustainably, and energy use is a big part of the effort.

"We're investing in more efficient refrigeration and lighting systems, and harnessing the power of renewables across the network too.

"We're proud to take the next step in our journey with the solar installation at Woolworths Moree.

"It will not only reduce the store's environmental footprint, but also help keep costs down so we can continue offering the best possible prices to our customers."

The solar rollout builds on the installation of LED lights and more efficient refrigeration and air-conditioning in the Moree store over the last two years.

A third of Woolworths supermarkets now have hybrid or HCF-free refrigeration systems. More than 800 supermarkets have energy efficient LED lighting, which reduces energy consumption in a store by around 10 to 15 per cent.

These upgrades to lighting in supermarkets alone have offset the equivalent power consumption of 50 stores.

The Woolworths Group generated more than 2,200 megawatt hours through solar panels in 2018.

In total, Woolworths' sustainability investments have helped deliver a 13 per cent reduction in carbon emissions on 2015 levels.