Fusion energy company Helion has raised a whopping $500 million in venture capital, with the possibility of an additional $1.7 billion in funding if key milestones are achieved over coming months and years. The company will use the new capital to build Polaris, its fusion generator version 7.0 that will be housed in a facility under construction in Everett, Wash. Helion officials expect that it will be the world’s first fusion electricity demonstration facility when it’s operational in 2024. The extra funding would allow the company to commercialize the technology.