Shareholders of Tesla Motors and SolarCity approved the electric automaker’s offer worth about $2.1bn to acquire the leading US rooftop PV player, a move that entrepreneur Elon Musk asserts will give consumers a one-stop shop for carbon-free energy.

“Your faith will be rewarded,” Musk told Tesla investors following the vote. Tesla said more than 85% of Tesla shares approved the deal, excluding those held by Musk (22% of total outstanding) and “other affiliated shareholders.”

Musk