OneRoof Energy, a US-based residential solar company, has raised $50m to launch its leasing programme so homeowners can now integrate solar into their new roof at no upfront cost.

Hanwha International, part of the South Korea-based Hanwha Group conglomerate that holds a controlling interest in the Hanwha SolarOne manufacturer, led OneRoof‘s series A round in return for "a significant, non-controlling stake".

Simon Lee, chief executive of Hanwha International, said: "With OneRoof Energy’s deep channel access and ease of scalability, we look forward to increasing solar affordability and accessibility to homeowners across the US market."

OneRoof Energy has also closed its first fund to finance residential solar projects in partnership with Black Coral Capital, a clean-tech investment firm, and with a subsidiary of US Bancorp.

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