TAMPA, Fla. — Zeno Power has signed a multimillion-dollar deal with Orano, a French nuclear recycler, to lock in a steady supply of americium-241 (Am-241) to fuel the U.S. startup’s long-duration space batteries.

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Jason Rainbow writes about satellite telecom, finance and commercial markets for SpaceNews. He has spent more than a decade covering the global space industry as a business journalist. Previously, he was Group Editor-in-Chief for Finance Information Group,...