The TTC experimented with hybrid electric buses during the middle of the first decade of the 21st century.
The first hybrid buses entered service in 2006, the same time CNG-fuelled buses were retired.

Under the Transit City plan in 2007, the TTC announced it would introduce new bus rapid transit (BRT) routes in certain transit corridors.
By 2008, the TTC increased service for 31 bus routes, and extended operating hours.
In 2009, the TTC opened its first BRT route that uses its own dedicated busway and bus lanes when route 196 York University Rocket was rerouted to the York University Busway.
When the extension of Line 1 to Vaughan Metropolitan Centre opened in December 2017, the 939B Finch Express is the only route continuing to use it.

The TTC ordered 27 articulated buses from Nova Bus, which began revenue operation in the spring of 2014.
At 18 metres (60 ft) long, as compared with a standard 40-foot bus, the Nova LFS Artics hold about 112 passengers, compared with 65 on the standard length bus.

As of 23 December 2016, all of the buses in the TTC system have Presto card readers.
Buses delivered to the TTC since 2017 have a new livery based on the livery of the Flexity Outlook streetcars.

In 2018, the TTC planned to buy 30–60 battery electric buses, which would help it meet its target of an emissions-free fleet by 2040.
To test the performance of electric vehicles, the TTC received three demonstration buses, one each from three electric bus manufacturers: New Flyer (part of NFI Group), BYD and Proterra.

In April 2019, the TTC received the first of 60 electric buses after ordering 20 each from Winnipeg-based New Flyer, Chinese-based BYD and California-based Proterra.
The 60 buses, plus infrastructure changes at three TTC garages, will cost approximately $140 million with the federal government paying $65 million of that cost.
The buses are powered exclusively by lithium-ion batteries that take about three hours to recharge.
The buses are expected to travel approximately 200 kilometres (120 mi) on a single charge; however, when the bus heater activates in cold weather, the range is reduced by 30–50%.
Per year, each electric bus will reduce carbon dioxide emissions by 149.2 metric tons (146.8 long tons; 164.5 short tons) and eliminate diesel fuel costs of $56,000.
The electric buses are 15–20% quieter in motion, and 85% quieter when idling.

On 3 June 2019, the first of the new electric buses went into revenue service on the 35 Jane bus route.
The bus, built by New Flyer, is based at the TTC's Arrow Road garage, the first garage to be equipped with recharging equipment for electric buses.
A bus on the 35 Jane route travels about 78 kilometres (48 mi) in a day.

On 26 October 2019, Proterra electric buses started to operate on the 6 Bay bus route.
These buses are operated exclusively out of the Mount Dennis garage.
By the end of 2019, the Eglinton garage was planned to be the third garage to be equipped with recharging equipment and would be used for BYD electric buses.

In 2020, effects of the COVID-19 pandemic caused TTC ridership to decrease dramatically.
On March 23, 2020, the TTC suspended all express bus services system-wide, with the exception of the 900 Airport Rocket and 927 Highway 27 Rocket.
A number of seats began to be blocked off to encourage social distancing.
The TTC experimented with hybrid electric buses during the middle of the first decade of the 21st century. The first hybrid buses entered service in 2006, the same time CNG-fuelled buses were retired.
Under the Transit City plan in 2007, the TTC announced it would introduce new bus rapid transit (BRT) routes in certain transit corridors. By 2008, the TTC increased service for 31 bus routes, and extended operating hours. In 2009, the TTC opened its first BRT route that uses its own dedicated busway and bus lanes when route 196 York University Rocket was rerouted to the York University Busway. When the extension of Line 1 to Vaughan Metropolitan Centre opened in December 2017, the 939B Finch Express is the only route continuing to use it.
The TTC ordered 27 articulated buses from Nova Bus, which began revenue operation in the spring of 2014. At 18 metres (60 ft) long, as compared with a standard 40-foot bus, the Nova LFS Artics hold about 112 passengers, compared with 65 on the standard length bus.
As of 23 December 2016, all of the buses in the TTC system have Presto card readers. Buses delivered to the TTC since 2017 have a new livery based on the livery of the Flexity Outlook streetcars.
In 2018, the TTC planned to buy 30–60 battery electric buses, which would help it meet its target of an emissions-free fleet by 2040. To test the performance of electric vehicles, the TTC received three demonstration buses, one each from three electric bus manufacturers: New Flyer (part of NFI Group), BYD and Proterra.
In April 2019, the TTC received the first of 60 electric buses after ordering 20 each from Winnipeg-based New Flyer, Chinese-based BYD and California-based Proterra. The 60 buses, plus infrastructure changes at three TTC garages, will cost approximately $140 million with the federal government paying $65 million of that cost. The buses are powered exclusively by lithium-ion batteries that take about three hours to recharge. The buses are expected to travel approximately 200 kilometres (120 mi) on a single charge; however, when the bus heater activates in cold weather, the range is reduced by 30–50%. Per year, each electric bus will reduce carbon dioxide emissions by 149.2 metric tons (146.8 long tons; 164.5 short tons) and eliminate diesel fuel costs of $56,000. The electric buses are 15–20% quieter in motion, and 85% quieter when idling. 
On 3 June 2019, the first of the new electric buses went into revenue service on the 35 Jane bus route. The bus, built by New Flyer, is based at the TTC's Arrow Road garage, the first garage to be equipped with recharging equipment for electric buses. A bus on the 35 Jane route travels about 78 kilometres (48 mi) in a day.
On 26 October 2019, Proterra electric buses started to operate on the 6 Bay bus route. These buses are operated exclusively out of the Mount Dennis garage. By the end of 2019, the Eglinton garage was planned to be the third garage to be equipped with recharging equipment and would be used for BYD electric buses.
In 2020, effects of the COVID-19 pandemic caused TTC ridership to decrease dramatically. On March 23, 2020, the TTC suspended all express bus services system-wide, with the exception of the 900 Airport Rocket and 927 Highway 27 Rocket. A number of seats began to be blocked off to encourage social distancing.
Toronto Transit Commission bus system