BARNSLEY Council is about to spend more than £4 million to switch to energy efficient light bulbs.
A significant proportion of Barnsley's residential street lighting stock is due to be replaced, changing from energy inefficient fluorescent lanterns to energy efficient LED lanterns.
Around 20,000 street lights will be replaced, with the vast majority of lighting columns remaining where they are.
The work, which will begin next month, has been funded via £4,296,600 of borrowing and will be paid back through future savings on energy costs.
It is estimated that once complete the new energy efficient lanterns will save the council around £500,000 a year.
Coun Roy Miller, cabinet spokesman, said: "These new street lights will help maintain a safe environment by keeping lit those areas that are vulnerable to pedestrians.
"They will also help drive down the council's carbon footprint."