Grid connection requested for US fusion power plant

An interconnection application is the formal process of requesting to "plug in" a new power plant to one of the USA's regional transmission organisations - it kicks off a series of deep engineering studies to ensure the grid can safely and reliably handle the influx of the new generating capacity and energy being provided and assess whether any network upgrades are required.

Commonwealth Fusion Systems (CFS) - a Massachusetts Institute of Technology (MIT) spinout company - said the application is the first-ever request from a grid-scale fusion power plant developer to a major regional transmission organisation. "By entering PJM's queue now, CFS will ensure that it will be able to connect to the grid upon completion of the power plant's construction," the company said. "Submitting this interconnection request helps to derisk delivering power from the ARC plant since it is one of the long-lead actions necessary to connect a grid-scale power plant in the early 2030s."

PJM coordinates the movement of wholesale electricity in all or parts of Delaware, Illinois, Indiana, Kentucky, Maryland, Michigan, New Jersey, North Carolina, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia. Its system serves about 182,000 MW of capacity to more than 65 million customers.

"Submitting the interconnection request is one of the long-lead actions necessary for providing power in the early 2030s because the start of the study process to the generation of electricity can take four to six years," CFS said.

PJM will use sophisticated grid simulation models to diligently stress-test the generation systems of CFS's fusion power plant to ensure it can connect reliably to help meet the region's surging energy demands.

"Our commitment to delivering the benefits of fusion, and enabling a future with abundant, secure energy, means that we're not just proving fusion physics works - we're showing exactly how fusion power plant watts get from our machine to the customer, working with the grid and a utility," said Bob Mumgaard, Co-Founder and CEO of CFS. "By becoming the first fusion energy developer to enter a major grid operator's interconnection queue, we're demonstrating that when you're serious about building a power plant in the early 2030s, you act now. This is execution."

Dominion Energy advised CFS on best practices for navigating PJM's interconnection process as part of its Joint Development Agreement with CFS.

"This marks another significant milestone for Commonwealth Fusion Systems and the development of fusion power in Virginia," said Ed Baine, Dominion Energy's Executive Vice President of Utility Operations and President of Dominion Energy Virginia. "We are grateful for the opportunity to support CFS in their efforts to make this exciting project a reality for Virginia."

CFS is currently working to build the SPARC prototype fusion machine at its headquarters in Devens, Massachusetts. It is described as a compact, high-field, net fusion energy device that would be the size of existing mid-sized fusion devices, but with a much stronger magnetic field. The doughnut-shaped device will use powerful electromagnets to produce the right conditions for fusion energy, including an interior temperature surpassing 100 million degrees Celsius. It aims to produce 50-100 MW of fusion power, achieving fusion gain greater than 10.

The plan is for SPARC to pave the way for a first commercially viable fusion power plant called ARC, which is intended to generate about 400 MWe - enough to power large industrial sites, or about 150,000 homes. ARC is scheduled to deliver power to the grid in the early 2030s.

In July last year, Google signed an investment and offtake agreement with Commonwealth Fusion Systems for 200 MW of power from its first ARC commercial fusion plant. In September, Italy's Eni - as a CFS strategic investor - signed offtake agreement worth more than USD1 billion for power from the plant.

CFS announced in plans December 2024 to independently finance, construct, own and operate a commercial-scale fusion power plant in Chesterfield County, Virginia. The company said it reached an agreement with Dominion Energy Virginia to provide non-financial collaboration, including development and technical expertise as well as leasing rights for the proposed site at the James River Industrial Park. Dominion Energy Virginia currently owns the proposed site.

CFS has now announced that the site has been named the Fall Line Fusion Power Station. The name references the geological boundary where Virginia's elevated Piedmont region drops down to the Tidewater coastal plain, creating the rapids on the James River.