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A partnership between Tesla and KIUC's (Kauaʻi Island Utility Cooperative) -- is vast -- 45 acres of solar panels situated among rolling green hills. Panels dip and rise with the contour of the land, feeding the energy of the sun to a 53MWh array of Tesla Powerpacks -- white boxes filled with batteries. That's more than double that of Tesla's battery Powerpack project in California.