• First Wind's 21-MW Kaheawa Wind II project on the Hawaiian island of Maui is producing power.
• The facility has a battery energy-storage system to smooth fluctuations in wind-energy output.
• Maui Electric Co. is the power customer.

From the article:

First Wind, an independent U.S.-based wind energy company, announced that construction of the 21 MW Kaheawa Wind II project has been completed and commercial operations have begun.