Tesla Motors now owns the nation's largest solar panel installer.
Tesla's deal to acquire SolarCity Corp. closed Monday morning.
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Shareholders of both companies approved the deal last week by wide margins.
The all-stock deal valued SolarCity at $2 billion based on Tesla's closing stock price Friday. It was worth $2.6 billion when Tesla and SolarCity announced the agreement in August, but their share prices have dropped since then.
Tesla CEO Elon Musk — who is also chairman of SolarCity — wants to sell solar panels through Tesla's stores. Customers can buy them to power their homes and charge their Tesla electric vehicles.
Musk says the companies' first joint product — solar roof tiles that look like traditional tiles — should be ready for installation by next summer.