MY2024 Hummer EV models are getting a new Level 2 onboard charger as standard on some trims that will enable bidirectional charging.
  1. 6kw external charge to other EV's
  2. 11.5kw onboard charger upgraded to 19kw.
  3. optional accessory to turn that 6kw output to regular outlets.

"GMC is expanding the charging capability of its Hummer EVs so that they can act as generators and send a charge to other electric vehicles.
The 2024 GMC Hummer EV pickup and SUV will be upgraded with standard 19.2-kilowatt Level 2 onboard charging capability on certain trims. The Hummer EV Edition 1 pickup available before the 2024 model year has 11.5-kW AC charging capacity.
The boost will give the Hummer EVs the ability to not only charge faster, but also offboard power for the first time through the Power Station generator — including the ability to send 6 kW of charge to other EVs, GMC says.
The capability and the 19.2-kW onboard charger will come standard on the 2024 vehicles in trims 2X and above, GMC said. The brand has said that includes the SUV's Edition 1, 3X and 2X trims and the pickup's 3X and 2X trims. A plug accessory to enable vehicle-to-vehicle charging will be an option, GMC said.
Before, "you could not effectively take power from the battery in this vehicle and put it into another vehicle. So in '24, we are enabling that," said Aaron Pfau, lead development engineer for Hummer EV. "The 19.2-kilowatt charger, Level 2 AC charger, that we have on board, that is really the key change that enables this."
GMC is offering a separate accessory to allow Hummer EVs to power equipment, such as a TV or heater, with 3 kW of juice."