Germany is turning on its monster stellarator

Edit: to add some additional context, the main problem with fusion reactors is confinement time and plasma stability. The general idea of a fusion power plant using magnetic confinement is that a gas is turned into plasma, confined magnetically, and heated until it can undergo significant fusion reactions. There are two core problems to creating fusion plasmas that could potentially produce power. One is pumping the plasma up to conditions that enable self-sustaining fusion by maintaining a high enough temperature from balancing the heat losses in the plasma against the heat gains from fusion reactions. The other is producing more energy from fusion reactions than was put into heating and containing the plasma. The longer the fusion plasma is contained the longer it has to continue fusion reactions and producing energy.

Tokamaks are easy to build but have a fatal flaw in that they have high plasma current, which makes them difficult to control with very unstable plasmas. Stellarators are vastly more difficult to build but they don't rely on currents in the plasma itself, which offers the potential for vastly longer confinement times.

EDIT: On reading further, it turns out I may have misinterpreted the article.