Utilities race to link up with fusion startups, Realta included

Fusion startup Realta Fusion this week announced a deal with Madison Gas and Electric to explore building one of the first grid-connected fusion power plants in the U.S., in Wisconsin. The partnership is part of a broader trend of utilities racing to court fusion startups — a courtship that reflects both utilities’ anxiety over future power supply and fusion’s technical progress.

The Realta deal covers construction of a 200-megawatt power plant, roughly enough to power a small city, sometime in the mid-2030s. Madison Gas and Electric also made an equity investment as part of the deal, though Realta did not disclose specifics. In addition to funding, Realta gains access to interconnection sites and engineering and technical assistance, while the utility gets early access to a technology it hopes could reshape the grid for decades. Realta is converting a former Oscar Mayer factory in Madison into its research and development facility.

Only a handful of fusion startups have struck utility deals to date, which is what makes agreements like this one notable. Commonwealth Fusion Systems is furthest along, nearly two years into a partnership with Dominion Energy to lease land in Virginia for its first commercial-scale plant, Arc, expected to generate 400 megawatts and come online in the early 2030s; Google and Eni have both agreed to buy power from it. Helion has been working with a Washington state utility on its 50-megawatt Polaris plant, aiming to turn it on in 2028 to supply Microsoft, while Type One Energy is building a 350-megawatt plant near Oak Ridge, Tennessee, on a former coal plant site as part of a deal with the Tennessee Valley Authority.

Utilities are typically cautious, but fusion’s recent scientific and engineering progress — combined with soaring power demand from AI data centers — has brought them to the table as a fossil-fuel-free source of round-the-clock baseload power that wind and solar can’t provide alone. For now, these deals mostly benefit the startups, which gain access to land and expertise that would otherwise be costly to secure on their own.

Why it matters

The deal underscores how AI-driven electricity demand is pulling utilities into long-horizon bets on fusion power years before any plant proves it can operate commercially at scale.