Amazon announced a significant expansion of its electric delivery van fleet from Rivian at an event in Seattle on Tuesday afternoon.

Details: The company says it now has 10,000 of its co-created vehicles — with a range of up to 150 miles — on roads in the U.S. covering 1,800 cities. The fleet, launched last summer, is now double the size that it was in July.

In addition, Amazon says it now has 12,000 chargers for its vehicles at over 100 delivery stations.

Context: Amazon currently has about 100,000 gas-powered delivery vans worldwide, which will be “slowly retired.”

Over 20,000 drivers have been trained around the country to drive the Rivians.Globally, Amazon has 279,000 delivery drivers dropping off 20 million packages a day.

The big picture: Amazon is now operating one of the largest fleets of electric delivery vans in the country.

Tracking the speed and scale of its progress is key to helping electric utilities plan for the future, as they bulk up their own capabilities to meet upcoming energy demand as logistics operators and automakers move away from gas-powered vehicles, experts tell Axios.

Decarbonizing transportation — the biggest source of greenhouse gas emissions in the U.S. — through electric vehicles is one of the key actions to helping the country meet its net-zero emissions target by 2050.