Street lights in a Gloucestershire village are being switched off in the early hours to save power and cut carbon emissions.
Switching off in Cam is expected to save £4,650 per year
The county council said turning off alternate lights in Cam between 0100 and 0600 BST would save £4,650 and 24 tonnes of CO2 per year.
Some residents have raised concerns that it could put their safety at risk.
A council spokesman said each complaint would be investigated and adjustments made as necessary to the pilot scheme.
One resident told the BBC: "I live in a small close and they've turned one out at the edge of a dark lane.
"It means the whole end of the close is in darkness which is not good in the winter months coming. I think they need to consider how to do this."
Council and parish councillor Dennis Andrewartha said: "Most crime takes place in day, the public perceives it takes place at night.
"But if we get complaints - we've had less than 10 to date - we are switching some of the lights.
"We are proactive in minimising what people see as a danger."
The county council's street-lighting manager Barry Greenaway said street-lighting accounted for 25% of the total electrical energy consumed by the authority.
"In July, it was decided we should roll [the scheme] out to other areas," he said.
"We wrote to 160 town and parish councils and to date we've received 50 responses and almost 40 support the project."