Privately held Sunrun, which is often tipped to be plotting an IPO, offered few details about the transaction, other than saying that $100m came from “a leading public institutional investor”, with the remainder coming from both new and existing investors.

The fresh money comes three months after Sunrun acquired REC Solar, a leading US rooftop PV installer, pivoting the company from being a specialist solar financier and operator into more vertically integrated rooftop PV player – putting it more directly in competition with SolarCity, the dominant company in the space.

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