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Younicos replaces batteries at Hawaiian site

UNITED STATES: Grid solutions company Younicos will upgrade a 10MW energy storage system at one of Hawaii's largest wind farms.

TerraForm Power's Kaheawa site uses 20 GE 1.5MW turbines (pic: Klaus Obel)
TerraForm Power's Kaheawa site uses 20 GE 1.5MW turbines (pic: Klaus Obel)

It will replace the existing lead-acid batteries at the 21MW second phase of TerraForm Power Kaheawa site on Maui with advanced Samsung SDI lithium-ion batteries.

The batteries are expected to be commissioned in the second half of this year, and will primarly be used to provide ramping services to smooth out wind variability, Younicos stated.

Lithium-ion technology will enable a higher usable energy capacity and increase the operational lifetime of the system, the company claimed.

The batteries will be managed by the company’s proprietary control software, which will enable fully automated operation without manual battery balancing, Younicos added.

Jayesh Goyal, Younicos’ managing director, said: "The combination of wind-plus-storage adds stability, while also making new revenue streams for renewables possible through services such as peak shifting or arbitrage."

The 10MW storage system will be connected to 20 GE 1.5MW turbines.  

According to the US Energy Information Administration (EIA), renewable energy projects using variable wind and solar technologies incorporate storage systems to regulate power and ensure reliability, because of the islands’ small grids.

An 11MW battery is also included at the 21MW Auwahi wind farm, also on Maui.

Xtreme Power, which was acquired by Younicos in 2014, built a 15MW storage unit for the 30MW Kahuku wind farm on Oahu, which was destroyed by a fire that same year.

After the fire — the third at the project — developer First Wind stopped using storage alongside the wind farm’s 12 2.5MW Clipper Liberty turbines.

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