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The combined solar and energy storage system is designed to give KIUC, the Kaua'i Island Utility Cooperative, dispatch-able electricity in the evening, and after the sun goes down. KIUC has a 20-year contract with SolarCity to buy the solar-generated electricity at a competitive price of 14.5 cents per kilowatt hour. SolarCity has chosen Tesla as its battery provider. The project now needs approval by the Hawaii Public Utilities Commission.

Last April, Musk unveiled a suite of batteries to store electricity for homes, businesses and utilities, marking Tesla's expansion beyond electric cars with battery technology that Musk said would "fundamentally change the way the world uses energy." The equipment allows businesses and homeowners to store power, reducing the need to rely on utility grids for electricity.

The deal with SolarCity and KIUC gives some momentum for Tesla Energy, and Musk has said utility-scale deals could be 80 per cent to 90 per cent of sales for the business unit. The company's Powerwall battery, which can be installed in home garages, has generated enormous interest from consumers. But the bigger market is the larger Powerpack, which allows utilities to reduce the need for expensive facilities that only run during times of peak demand.

SolarCity's deal also shows how Musk's two companies can link up to help each one find more business in two relatively nascent markets.

"Global excitement in Tesla Energy products remains very strong," said Tesla in its recent fourth-quarter letter to shareholders. "To accommodate this demand, we transitioned production to the Gigafactory in Q4. While this transition did take slightly longer than we had expected, both Powerwall and Powerpack production is now operating smoothly and expanding at the Gigafactory."



Read more: http://www.afr.com/technology/solar-power-at-night-solarcity-and-tesla-say-they-can-do-it-20160216-gmvy21#ixzz40N2AsyRC
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