News Summary

• Oscar-winning documentarian Alex Gibney spent four years making his film Musk.
• Gibney says he was a "proud" owner of a Tesla Powerwall energy storage system at his home.
• But Gibney's perspective shifted as he prepared his film, Musk.
• Musk opens in theaters Friday and is due to stream on HBO in a few months."I started out as — if not an admirer — at least somebody who is sort of interested in what he was doing and liked it," Gibney said.