The inaugural test phase will run through mid-March, after which point it'll get an upgrade to let it run hotter and longer. Eventually, it should discharge for up to 30 minutes at a time, and muster a heating power of 20 megawatts.

The machine comes at a high price in more ways than one. It took roughly 19 years to design and build Wendelstein 7-X at a staggering cost of €1.2 billion, or about $1.3 billion. That's a lot of effort for a testbed device. However, it could pay off if it leads to a much more powerful (not to mention less dangerous) alternative to nuclear fission energy.