Project Details

Project Name:
Kaheawa Wind Power II
TerraForm Power, Younicos (previously SunEdison/First Wind)
21 MW + 10 MW BESS
Tax Map Key:
PUC Docket:
Project Status:
Phase II of Kaheawa Wind Power (KWP II) adds 21 megawatts (MW) of renewable energy and battery storage to the existing 30 MW Kaheawa Wind Power I wind farm (KWP I), which has been operating above Maalaea since 2006. Maui Electric Company (MECO) purchases power from this facility under contract at $0.20767/kilowatt-hour (average fiscal year 2018 price) through July 2032. KWP II became operational in 2012 and features a 10 MW battery-based energy storage system manufactured by Younicos and installed in 2018. The new advance Samsung SDI lithium-ion batteries will replace the existing lead-acid batteries originally installed by Xtreme Power and will provide a significantly higher usable energy capacity potential, decrease project curtailment, and increase the operational lifetime of the system. KWP I and II have capacity to provide 10-15% of Maui's electricity needs or enough to power 20,000 homes. Originally built by First Wind on land leased from the State similar to KWP I, KWP II is currently owned by TerraForm Power. In 2018, the three major wind farms on Maui provided just over 23% of Maui's overall energy needs. In April 2019, the US Fish and Wildlife Service initiated a Programmatic Environmental Impact Statement (PEIS) review in response to applications from four Hawaii wind farms -- Auwahi Wind Farm (Maui), Kaheawa Wind Power II (Maui), Pakini Nui Wind Farm (Hawaii), and Kawailoa Wind Power (Oahu) -- to amend their Incidental Take Permits authorizing the take of three endangered species found only in Hawaii: the opeapea (Hawaiian hoary bat), nene (Hawaiian goose), and uau (Hawaiian petrel). The PEIS provides a comprehensive analysis of cumulative impacts across all four projects.