Megawatt Charging: The Game-Changer for Long-Haul Electric Trucks

The electrification of semi trucks began with cautious steps—primarily short-haul routes where vehicles could complete their tasks on a single charge. These included big rigs handling drayage runs to transport shipping containers between ports and nearby warehouses, or delivery vans operating within city limits.

Short-haul routes made sense for early electric truck adoption. Semis are massive and heavy, requiring substantial battery capacity and charging time. Overnight recharging at base depots was sufficient for these vehicles to return to service the next day. However, for electric semis to handle regional and national routes, they need fast-charging infrastructure capable of delivering far more power than standard passenger EVs.

That infrastructure is now on the horizon. At last week’s ACT Expo in Las Vegas, where industry leaders discussed electrification, advanced fuels, and AI, the focus was on megawatt charging—a technology poised to make long-haul electric trucking as practical as diesel-powered alternatives.

How Megawatt Charging Changes the Game

Current EV semi truck charging speeds max out at 350 kilowatts. While impressive for passenger vehicles—Hyundai’s Ioniq 5, for example, can charge from 10% to 80% in about 15 minutes—this speed is inadequate for semis. At 350 kW, a truck would require hours to recharge, disrupting tight delivery schedules.

Megawatt charging redefines these limits. Technically, the category includes any charger over 600 kilowatts, with some reaching up to 1.2 megawatts. The Tesla Megacharger, designed for the Tesla Semi, represents the upper end of this spectrum. Its 1.2-megawatt version can replenish about 60% of a truck’s battery in 30 minutes—the duration of a federally mandated break after eight hours of driving.

Henry Johnson of Alpitronic, a company deploying high-powered charging in Europe, noted that even 700 to 800 kilowatts is sufficient to fully charge a truck for the remainder of its journey in roughly 45 minutes.

Europe Leads, but the U.S. Is Catching Up

Megawatt charging has already gained traction in Europe, which is ahead of the U.S. in electric trucking adoption. One panel at ACT Expo was titled “Megawatt Charging in Europe: Lessons for the U.S. Market.”

Patrick Macdonald-King, CEO of Greenlane—a Daimler-backed group building a network of electric and hydrogen refueling stations in America—confirmed that megawatt charging is imminent in the U.S. “

Megawatt charging is coming this year. We’re not building anything without it.

Greenlane’s flagship station near San Bernardino, California, currently features a couple dozen 400-kilowatt plugs. However, future stations planned along routes between Los Angeles and other major hubs will incorporate megawatt-capable infrastructure to support long-haul electric trucking.