The deal was on a listing of proposed transactions that won quick approval because the merging companies have few or no overlaps.

The deal was announced on Aug. 1 and is part of an effort by Tesla to improve economies of scale in electrical energy management systems, battery production and marketing.

SolarCity’s shares rose 0.4% while Tesla was up 0.3% on Thursday.

SolarCity has come under pressure from rivals offering low-cost solar energy through large, utility-scale installations, and because some state governments have reined in subsidies that encouraged rooftop solar.