Greenpeace UK's Rebecca Newsom said this was an opportunity to ensure that London emerged from the tragedy and economic downturn caused by the virus with climate-friendly policies.
"Green, affordable public transport is crucial for delivering a successful recovery as we emerge from lockdown," she said.
"These plans for renewable Power Purchase Agreements with TfL take an important step in the right direction.
"If they are rolled out at the right speed and scale, they will also help to boost renewables across the UK, supporting green jobs and progress towards meeting our national climate targets."
In 2019, the UK government set a target of becoming net-zero greenhouse gas emissions by 2050.
