April 9, 2026 by Alex Graziano [Senior Content Marketing Manager]

It’s time for a brand new virtual tour of the SPARC facility, the building on CFS’ campus in Devens, Massachusetts, where we’re building a donut-shaped fusion machine called a tokamak.

SPARC isn’t a full fusion power plant but rather a proof-of-concept machine whose primary purpose is to demonstrate that we can produce more power from the fusion reactions than it takes to heat up the fusion fuel, called a plasma. In scientific circles that net fusion energy milestone is called Q>1, a key step toward putting fusion electricity on the grid. As well as demonstrating Q>1, SPARC will help inform parts of the design of our fusion power plant, ARC, that we’ll build in Chesterfield County, Virginia. We haven’t yet broken ground on that facility, but we’ve made significant strides on ARC’s design.

“Everything we learn about SPARC as we finish construction and start commissioning we’re starting to incorporate into our [ARC] design,” said Alex Creely, Chief Engineer of ARC Conceptual Design, a SPARC expert, and your tour guide in this video.

SPARC is a cutting-edge facility that we expect will help reshape the world’s energy landscape. Its ultrapowerful magnets will confine superhot fusion fuel to achieve that Q>1 demonstration, acting as an integrated test of most of the systems necessary to build a fusion power plant that’ll bring clean, baseload electricity to the grid.

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