In brief

Elon Musk's efforts to bring electricity back to Puerto Rico has finally proven successful. A local children's hospital had its power restored thanks to a combination of solar energy and Tesla's Powerwall energy storage batteries.

The first of Elon Musk’s solar energy-Powerwall projects has successfully restored power to a local hospital in Puerto Rico, according to a tweet from Tesla earlier today. Hospital del Niño, a children’s hospital in San Juan, Puerto Rico, is among those working with Musk. The Tesla CEO and founder offered to provide a few hundred energy storage batteries to facilitate the Carribean island’s efforts to restore energy after its grid was devastated by Hurricane Maria.

Tesla isn’t the only one working to return electricity to Puerto Rico. A similar effort is also being made by a two-year-old company from Montana calledWhitefish Energy. The company signed a $300-million contract with Puerto Rico’s Electric Power Authority to complete infrastructure work that will provide energy to key industrial facilities needed to kick-start the island’s disrupted economy.