“General Motors believes in an all-electric future,” said Mark Reuss, GM’s head of product development, at a media event on Monday where the company announced plans to release two new electric vehicle models in the next 18 months—and a total of 20 by 2023.

That future “won’t happen overnight,” Reuss admitted, declining to estimate when GM will discontinue gas-powered vehicles entirely. But the company once famously blamed for killing the electric car did offer some details on its pathway towards a zero-emissions future: Some new models will be battery powered, while others will run on hydrogen fuel cells. GM also plans to release an electric heavy-duty truck, somewhat spookily called the Silent Utility Rover Universal Superstructure (SURUS), that could be used for anything from a delivery vehicle to an ambulance.