Car rental giant Hertz announced this week a $4 billion deal to  purchase 100,000 electric Tesla vehicles, and said half those cars would be made available to Uber drivers at low rates.

TNC drivers with high ratings and at least 150 Uber trips in some markets will be able to rent the electric vehicles for $344 a week, potentially lowering their costs to drive for the company. Hertz said that price will eventually come down to less than $300. It’s the biggest deal ever for Tesla.

The 50,000 Teslas are expected to be available for Uber drivers by 2023.