Up to 1,600 council-owned homes are set to benefit from solar power in a partnership between the county council and its arms-length housing management company, Homes for Northumberland (HfN).
The first residents who are due to reap the rewards of solar panels have received information about the scheme, and work is now underway.
The project is targeted at homes in the Alnwick and Boulmer areas, as well as in Cramlington and Blyth, and will help residents to lower their electricity bills, as well as reducing fuel poverty.
After all the panels are installed, it is estimated that they could reduce carbon emissions in the county by around 1,300 tonnes a year.
Around 540 systems a year will be installed, over a three-year period, and HfN will have a maintenance team to look after them.