Hawaii has aggressive renewables standards, aiming to generate all of its electricity from renewable sources by 2045 (up from about 28% in 2017). Currently in Hawaii, about a third of single-family homes already have rooftop solar; however, when considering all potential customers (including residential, commercial, and industrial), adoption of solar is at about 18%. Under modeling plans to reach the renewables goal, Hawaiian Electric Company (HECO) will have to significantly expand installation of solar on both rooftops and ground installations. However, the utility has also performed hosting capacity assessments across all of the feeders that it serves and has determined that voltage and thermal limits are already being reached on many feeders – in some cases, feeders are hitting both the upper and lower regulatory limits for voltage at different points along the line. In order to install additional solar, the utility has needed to turn to innovative power regulation hardware to regulate voltage in the network and improve hosting capacity for renewables.
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