Transport for London had previously proposed to scrap the electric vehicle exemption entirely.
It said without changes, about 2,200 more vehicles would use the congestion charging zone on an average weekday in 2026, increasing congestion and undermining the current scheme.
The Auto Pay discounts for electric vehicles are due to be reduced further in 2030 – to 12.5% for electric cars, and to 25% for electric vans, HGVs, light quadricycles and heavy quadricycles.
From March 2027, for new applicants only, the 90% residents’ discount will also only be available for EVs.