constellation-energy
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The Company Betting America's Grid on a Reactor It Once Switched Off
It runs the largest nuclear fleet in the country, sells power to three-quarters of the Fortune 100, and just agreed to bring a piece of Three Mile Island back online for Microsoft. Inside the utility quietly rewiring how America pays for clean power.
Rob Cirincione
Rob Cirincione is the co-founder and CEO of Sunairio, a Baltimore-based weather intelligence company that helps energy traders, utilities, and grid planners price the risk hiding inside the weather. A Princeton-trained engineer with a master's from MIT, he spent over 12 years trading power at Constellation Energy and Boston Energy Trading & Marketing before deciding the off-the-shelf weather forecasts the whole industry relied on were dangerously blurry. Sunairio runs thousands of high-resolution simulations to catch the rare extreme hours that drive most grid risk, and in 2025 launched ONE, a next-generation grid forecast model trained on its proprietary high-resolution climate archive.