Tesla has delayed the rollout of its solar roof.

The company originally said it would begin selling its solar roof in April, but CEO Elon Musk said that two of the four shingle options wouldn't be made available until early 2018. A Tesla representative declined to comment further on why the timeline had changed.

Tesla unveiled its solar roof in late October, about a month before the company acquired SolarCity in a deal worth $2.1 billion. Tesla CEO Elon Musk has said the solar roof would be cheaper than a normal roof even before factoring in the price of electricity.

Here's everything we know about the new solar roof: