Fusion developers try to soothe investors' FOMO

Fusion energy developers face a single question: How soon will their technologies begin generating electricity?

Why it matters: After decades of development, fusion remains years and billions of dollars from commercialization — and investors are getting impatient.

Catch up quick: Fusion power developer Type One Energy today became the latest startup in the sector to hitch an upcoming fundraise to a commercial contract.

• The Tennessee Valley Authority issued a letter of intent to build one or more power plants using Type One technology, and also issued a contract for early engineering and other "first activities," CEO Christofer Mowry says.

What they're saying: "This really de-risks the path to commercialization," Mowry tells Axios Pro.

💭 Alan's thought bubble: De-risking is a matter of perspective.

• The LOI contains plenty of conditions, and construction ultimately depends on the results of Type One's prototype, which won't begin operation until 2029 at the earliest.
• Type One, meanwhile, will need to raise "sub-$1 billion" to fulfill those plans — and this year, it split a planned $200 million Series A into two rounds leading up to and following the TVA deal.

Yes, but: Such LOIs are common in energy. And other fusion developers, in particular, have announced similar commercial deals.

• Commonwealth Fusion Systems over the past year signed agreements with Dominion Energy and Google, which helped propel the startup's $863 million raise.
• Helion in May 2023 agreed to supply 50 MW to Microsoft, helping drive a $425 million Series F that closed at the start of this year.

What we're watching: Fusion investors tell Axios Pro they're split on whether such milestones should fuel further private rounds — or instead be leveraged to support public listings.