The companies represent residential solar sales, design and installation, wholesale distribution, mounting systems and hardware businesses of Mainstream Energy.
REC Solar will continue as an independent organisation under the legal name REC Solar Commercial, in the commercial market.
Sunrun CEO Lynn Jurich said the company pioneered solar service to remove the most significant barriers to going solar.
"REC Solar’s residential division, AEE Solar and SnapNrack complement our thriving channel business and further enable us to fulfill the enormous market potential for home solar nationwide," Jurich added.
Mainstream Energy CEO Paul Winnowski said, "Mainstream Energy and Sunrun have always been perfectly aligned in focusing on customers, maintaining high quality and driving down costs."
