Congrats to @Dkirtley and @Helion_Energy on their $465M Series G at a $15.5B valuation! Helion is building the world's first commercial fusion power plant, Orion. Their Polaris prototype recently exceeded 150 million degrees Celsius, the first privately funded fusion machine to run on deuterium-tritium fuel. They've already signed a power purchase agreement with Microsoft to deliver 50 megawatts of power for its data centers by…