All 1,250 payments of Â£10,000 for taxi drivers to take their diesel vehicles off the road have been awarded.
It means around Â£30m of the wider Â£42m delicensing fund has been spent.
Taxis are currently responsible for 25% of harmful NOx emissions and next year they will be the biggest source of transport pollution in central London. TfL has a target to reduce emissions from taxis by 65% by 2025.
Black cabs are exempt from London’s Ultra Low Emission Zone (ULEZ).
An electric taxi costs between Â£50,000 and Â£100,000, though running costs are around Â£100 per week lower than diesel.
Alex Williams, TfL’s Director of City Planning, said: ‘The air quality crisis means it is imperative to reduce the maximum age limit for taxis.
‘We will continue to support taxi drivers in making the transition to zero-emission with a range of grants and an ever-expanding rapid charge point network.’
In January, The Mayor of London increased the size of the green fund to Â£42m, meaning that Â£10,000 payments were available to the first 1,250 taxi drivers to sign up.
Payments to encourage the uptake of zero-emission capable cabs will continue on a sliding scale and are made on a first come, first served basis, with payments at the Â£8,000 threshold still available.
From January 2018, all new taxis licensed for the first time must be zero-emission capable (ZEC).
TfL has also now confirmed the age limit for black cabs will be reduced to 12 years for Euro 3, 4 and 5 taxis by 2022.
From November, the current 15-year age limit will apply to the anniversary of the date when the vehicle was licensed, with a proposed reduction in the age limit to 14 years from November 2020 and an annual reduction of one year each year until the 12-year age limit is reached.
Euro 6 taxis, those converted to liquid petroleum gas (LPG) and zero emission taxis will retain the 15-year age limit.
Darren Shirley, Chief Executive of Campaign for Better Transport, said: ‘London’s cabbies embracing the shift to zero-emission vehicles will be a key element in reducing emissions and improving air quality in the capital. But we still need to see more being done to speed up the transition to zero-emission vehicles across the country.’
Photo Credit – Pixabay