Up and Running at Koloa Substation - Kauai Island Utility Cooperative

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Xtreme Power’s dynamic power resources after installion at the Koloa Substation. 10 KIUC CURRENTS By Anne Barnes Battery Storage System Up and Running KIUC signed a contract on January 10, 2011, with Xtreme Power Inc. to purchase a 1.5megawatt utilityscale battery storage system. Xtreme Power’s dynamic power resources was installed, blessed and placed in operation in the fourth quarter of this year at the Koloa Substation. As reported earlier this year, this storage system will help mitigate the effects of a 3megawatt photovoltaic project, which also will feed into Koloa. In support of KIUC’s commitment to incorporate greater amounts of renewable energy, KIUC management and staff sought solutions to effectively integrate large, intermittent generation resources into its system, as necessary, to remain consistent with the coop’s strategic goals and initiatives. KIUC has distinctive challenges with regards to stability. Solar systems are subject to output unevenness due to factors such as clouds passing over an installation. The addition of the battery storage system will allow KIUC to smooth the power output from PV projects by providing real and reactive power, compensating for sudden output fluctuations in a matter of milliseconds. That will allow for a more predictable flow of power from the PV system to
Photos by Shelley Paik KIUC’s electrical grid, and will give KIUC the ability to respond to other system events, such as loss of generation and system faults. KIUC staff is analyzing the effects and benefits of expanding storage in the future. Battery storage answers the call for KIUC on many levels, aside from frequency regulation. It serves as emergency backup power and reduces the need for hardtosite transmission infrastructure. As KIUC moves forward with its Kaua‘i Smart Grid Initiative, battery storage will play an important role. Photos right from the top: Senior System Planner Cory Gokan shows the plans for the battery before the pad was poured. KIUC construction crews pour the concrete pad that will hold the storage system. The Kaua‘i Commercial truck delivers the battery to the Koloa substation for installation. Some renewables pose challenges to grid stability, so groundbreaking energy storage and grid support systems are crucial to additional integration of renewable energy. DECEMBER 2011 11
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Page 5 and 6: By Paul Daniels A Picture’s Worth
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Up and Running at Koloa Substation - Kauai Island Utility Cooperative

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