In November, Tesla announced it was powering nearly the entire island of Ta’u in American Samoa using solar power and packs of its massive commercial battery, the Powerpack 2.

The announcement, made just a few days after Tesla acquired SolarCity, showed a bigger push by the automaker to grow its energy business.

Although Tesla has yet to get its solar roof product on the market, Tesla’s battery division has been growing. To date, 300 megawatt-hours worth of Tesla batteries have been deployed in 18 countries.