Long touted as a likely IPO candidate, San Francisco-based Sunrun is a formidable force in the US residential solar market – second only to Elon Musk’s SolarCity in the amount of customers on its books and the amount of revenue those customers are expected to generate for the company over the years.

Like SolarCity and Vivint, venture capital-backed Sunrun relies on the third-party ownership model, signing solar leases and PPAs with customers.

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