Helion reports plasma compression milestones en route to net electricity

Helion Energy disclosed in a quarterly investor update that its seventh-generation Polaris device has achieved 95% of the magnetic field strength called for in its design, a step the company described as the last major engineering gate before integrated D–He³ pulse testing later this year.

Polaris is the first Helion machine designed to directly demonstrate net electricity recovery rather than net thermal energy — a distinction the company has emphasized since signing a 50 MW power-purchase agreement with Microsoft in 2023. The contract calls for first power by 2028.

Independent observers continue to flag tritium management as the program's weakest link. Recent modeling at Helion's Bothell facility shows secondary D–D reactions producing roughly 4× more tritium than the 2023 design margin allowed for, requiring a redesigned recovery loop. CEO David Kirtley framed the shortfall as “a quarters problem, not a physics problem.”