Tesla’s solar roof will ‘cost less than a normal roof’

Just after a majority of Tesla Motors tsla shareholders approved plans for the all-electric automaker to acquire solar energy firm SolarCity scty , Tesla CEO Elon Musk dropped one of his famous bombshells, this time about the company’s new solar roof product.

According to Business Insider, Musk made the surprising pronouncement after 85% of Tesla shareholders approved a $2 billion merger with solar-energy specialist SolarCity on Thursday.

“Excluding the votes of Elon and other affiliated shareholders, more than 85% of shares voted were cast in favor of the acquisition”, Tesla said in a November 17 statement. With SolarCity under its own brand, Tesla will become the first integrated sustainable-energy company, selling energy generation, energy storage, and sustainable transportation products.

Musk said in the shareholder meeting that people should be going after solar roofs in the future as they look better than traditional roofs, cost less, generate electricity, and are also more durable.

Last month Tesla took the wraps off the company’s latest efforts, solar roof tiles. Traditional roofing materials are bulky and heavy, making for expensive shipping costs. Many analysts saw this as a bailout of SolarCity by Tesla, as the solar roof installer had been facing financial troubles.

“Electricity is just a bonus”, the billionaire told the crowd.

“By leveraging SolarCity’s installation network and Tesla’s global retail footprint, we can do this in a way that is seamless for our customers and that we expect will create significant value for our shareholders”, it continued.

Tesla is also gearing up to launch its Model 3, which is the firm’s first mainstream electric vehicle.

Musk claims the roof, which looks like a normal roof, will have the most efficient solar cells at the lowest price. SolarCity’s stock rose 2.9 percent to close at $20.40.

Not all shareholders agreed: Some have filed lawsuits, questioning whether Tesla would really benefit from taking on SolarCity. Gracias, founder and CEO of Valor Equity Partners, is a member of the board in both companies. SolarCity has recorded losses in six of the last eight quarters.