As relief efforts continue to take place in Puerto Rico after a Category 4 storm, Hurricane Maria, caused widespread devastation and created an island-wide black out, California-based Tesla is shipping hundreds of Powerwall battery systems to the unincorporated U.S. territory and restoring electricity to some 3.5 million residents left without power. Tesla’s Powerwall battery system, first introduced in 2015, is designed to be a residential stationary energy storage unit that can be charged through solar panels.

Tesla continues to send shipments of Powerwall systems into the region and working with local organizations on restoring electrical power back to the island. Tesla employees are currently on site and working on pairing its Powerwall battery systems to solar panels. A Tesla spokesperson has confirmed that the company continues to ship Powerwall systems into the storm-ravaged island that’s located 1,000 miles south east of Florida.

In addition to sending hundreds of Powerwall systems into Puerto Rico, Tesla CEO Elon Musk has personally donated $250,000 to aid in relief efforts, according to Fortune.

Tesla’s effort to help victims of Hurricane Maria follows recent efforts made in South Florida after the company unlocked more battery range for Model S and Model X owners affected by Hurricane Irma through an over-the-air software update, extending the electric vehicle’s battery capacity from 60 kWh to 75 kWh.