Kauai now generates 80% or more of its energy from solar panels, and they also use batteries to compensate for the drops in solar energy output at nighttime and when clouds are over the large arrays. This is exciting and a great opportunity for Tesla, especially once the new Tesla Gigafactory becomes fully operational. It's also a great learning example as the use of solar/wind continues to expand (hopefully).
More at Battery Performance Is Hurting Hawaii's Solar Push | MIT Technology Review.
More at Battery Performance Is Hurting Hawaii's Solar Push | MIT Technology Review.