Tesla is powering the Hawaiian island of Kauai with solar panels.

Tesla officially unveiled the project Wednesday morning in Kauai following opening remarks by CTO JB Straubel and David Ige, governor of Hawaii. Tesla partnered with the Kauai Island Utility Cooperative (KIUC) to launch the project.

The solar farm is composed of 54,978 solar panels with 13 megawatts of solar generation capacity. Tesla has also installed 272 of its large commercial battery, Powerpack 2, to store the solar energy to use at night.

The project is expected to reduce fossil fuel use by approximately 1.6 million gallons per year, Tesla estimates. Tesla will begin turning on the massive solar system in phases beginning Wednesday.

Tesla is diving into solar energy following its acquisition of SolarCity last November. Tesla is also powering nearly the entire island of Ta’u in American Samoa with solar power and its Powerpacks.

Before Tesla acquired SolarCity, the two companies agreed in February 2016 to use Tesla’s 52 MWh Powerpack to bring 20 years of power to Kaua’i, so this project has been in the works for quite a bit.

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