Helion Energy, Inc. is a fusion power company headquartered in Everett, Washington. Founded in 2013 by David Kirtley, John Slough, Chris Pihl, and George Votroubek, it develops pulsed magneto-inertial fusion technology using deuterium and tritium or helium-3 fuel. The company has raised over $1 billion, with Sam Altman serving as chairman. It operates prototypes including Polaris and is constructing the Orion power plant in Malaga, Washington, under a 2028 power purchase agreement with Microsoft.